Breeders focus on plant characteristics when breeding cannabis seeds such as their potency, flavor, yield, smell, resistance to pests, color, growth stature and other characteristics. Marijuana Cultivation/Producing Seeds Sooner or later every grower is going to want to produce marijuana seeds. Developing a new stable strain is beyond the scope of this discussion and requires How long does it take to germinate cannabis seeds? When to transplant seedlings? When to start vegging and flowering? Grow your knowledge about the lifecycle of the cannabis plant.
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Breeding Cannabis Seeds
Step #1 For Cannabis Seeds
You will want to begin by choosing parents for breeding cannabis seeds. Selecting the female plants for breeding is much easier than selecting male plants.
Breeders focus on plant characteristics such as their potency, flavor, yield, smell, resistance to pests, color, growth stature and other characteristics when choosing a female to breed cannabis seeds.
Choosing male plants is not easy since males don’t reveal their characteristics like females do. Some breeders will rub their fingers on the male plants stem to be able to better smell their resinous odor. The best way to test for male characteristics is by a progeny test where the male pollen is harvested and then placed on certain plants.
These plants will create seeds and the next season those seeds are planted then grow up to show off their characteristics. Once a male plant is selected for breeding the other male plants are then cut down and destroyed.
Step #2 Is Collecting Pollen
You will collect pollen from the male plant that you have chosen and strip away all extra male branches to guard against random pollination then isolate the male as soon as anthers show. Before the anther’s open, you will place a plastic bag over the branch and tie it to prevent it from falling.
You will keep the bag over the branch for several days to collect pollen then carefully remove the branch and bag so pollen does not escape from the bag.
Step #3 Storing Cannabis Seeds’ Pollen
You can now either store the male pollen indoors since pollen in a natural condition in the wild will not last for long. Be sure that the storage container that the pollen is stored at low temperatures and moisture since as high temperatures, as well as humidity, will destroy pollen very quickly.
Pollen that is harvested can be stored for several months when it is stored in a freezer. To store pollen in the freezer you will first need to use a fine screen to filter out the plant leaf matter from the anthers that may have fallen into the bag.
If these are not removed it can contaminate the pollen and cause it to spoil. Before you filter the plant material you will want to lay down some wax paper or place a plate that is clean to capture the falling pollen.
You can then place the pollen in a sterile container, tube or sealed bag to make sure that the pollen for cannabis seeds is clean and sterile. When you are freezing the harvested pollen you will not want to continually freeze and thaw it out since this will diminish the viability of the pollen. Use only what is needed and leave the rest frozen.
Step #4 Using Pollen For Cannabis Seeds
Pollination occurs when male pollen comes into contact with the female pistil. Depending on which plant variety you choose to breed the female flowers will be ready to be pollinated within two (2) to twelve (12) weeks after the flowering cycle has been introduced to the plants.
The more pistils that are visible when pollinating then more cannabis seeds will be created. Female pistils that are turgid and most often white or off-white are the best to be pollinated.
Any pistils that are rust- or brown-color are beyond the point that you can fertilize. To pollinate a female plant, you will first cover the female branch with a pollen-filled bag then briefly shake the bag to make sure the pollen makes contact with the female pistils.
You can leave the bag over the branch for two (2) days to ensure pollination occurs. Many times cannabis breeders will contain the male pollen and pollinated-female plants in a separate room to prevent other cannabis plants from being fertilized.
After a few days in the pollination room, the female plant is sprayed with water to destroy the pollen that remains on the plant before the female plant is moved back into the flowering room. This is to prevent any remaining pollen from fertilizing other plants.
Also be sure to spray any room that you have allowed for pollination to occur. Another way to pollinate a female plant is to use a small paintbrush to ‘paint’ pollen onto the pistils for cannabis seeds. You will simply dip the paintbrush into a container of pollen and gently brush the pollen onto a female plant’s flowers.
Be sure that all fans are off to prevent the pollen from being blown around the room. This method is perfect for growers who want to have cannabis seeds created on only a few branches and leave the rest of the female flowers sinsemilla.
After a plant is fertilized the cannabis seeds will be ripe in about six (6) weeks but could be ready earlier. When seeds are mature they will split the calyxes open and make the cannabis seeds visible.
The seeds that are most ripe are seeds that have a dark brown or grey color and well-mottled (tiger striped) and will set loosely within the calyx. Seeds that are not viable and immature will be green, yellow or white in color as well as will be in sealed calyxes.
If you have seeds that are not mature by the end of the plants life-cycle then you can eat the immature cannabis seeds. Plants that are sativa dominant tend to allow seeds to fall from their small, lightly packed buds and while indica dominant plant seeds tend to stay within the large, densely packed buds.
Seeds are harvested from buds by either manually finger-picking each of the seeds out or by crushing the buds to separate the bud from all seeds. Seeds are often tested for their viability with a simple press between your thumb and index finger to test the seeds firmness.
If the seed splits open with this test it means that the seed is not viable or immature. If the seed is very firm then those cannabis seeds will tend to be viable.
Once seeds have broken the calyx then they are ready to plant immediately, if you choose to do so. Otherwise, the seeds may fall off the plant and germinate below the plant.
These ideas and methods are only a guideline for small-scale cannabis seed production. If you plan on producing massive amounts of seeds you will need to adjust what is done to be effective.
Many breeders will clone a male plant so they have multiple-males within a very large room that are able to pollinate many, many females. It all depends on what you plan on doing.
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Marijuana Cultivation/Producing Seeds
Sooner or later every grower is going to want to produce marijuana seeds. Developing a new stable strain is beyond the scope of this discussion and requires the ability to grow hundreds or even thousands of breeding plants. However, just about any grower can manage to preserve some genetics by growing f2 seeds where they have crossed a male and female of the same strain, or can produce a simple cross which would be referred to as strain1xstrain2 for instance white widow crossed with ak-47 would be referred to as a WW x AK-47. You can produce some excellent seed and excellent marijuana this way.
To Feminise or not to Feminise Edit
There are numerous myths surrounding feminized seeds. Feminizing seeds are a bit more work than simply crossing two plants naturally. However it will save you a lot of time in the end. If you make fem seeds properly then there is no increased chance of hermaphrodites and all seeds will be female. This means no wasted time and effort growing males and it means that all your viable seeds produce useful plants. Since roughly half of normal seeds are male this effectively doubles the number of seeds you have.
Feminized seeds are bred to contain no male chromosomes, which will be able to produce the crop of resinous buds sought by most growers. For gardeners who require a quick and easy cultivation process, feminized seeds are the ideal choice. Some medicinal cannabis users may be deterred from growing their own supply because of the perceived difficulty of growing or of identifying the different genders and removing males early in the blooming period. Feminized seed-strains offer a simple solution to these issues, as there is no need to spend time in the first weeks of flowering checking for male plants.
Other times you will have no choice but to produce feminized seed because it will be a female plants genetics that you want to preserve and you won’t have any males. Perhaps you received these genetics via clone or didn’t keep males.
The new thing on the market for commercial Cannabis cultivation are auto-flowering feminized strains. By crossing of the cannabis ruderalis with Sativa and Indica strains many cultivators have created interesting hybrids which boast benefits from both sides of these families.
The first ‘auto-flowering cannabis seed’ which came on the market a few years ago was the Lowryder #1. This was a hybrid between a Cannabis ruderalis, a William’s Wonder and a Northern Lights #2. This strain was marketed by ‘The Joint Doctor’ and was honestly speaking not very impressive. The genetics of the ruderalis was still highly present which caused for a very low yield and little psychoactive effect. Not very attractive.
Auto-flowering cannabis and the easily distributed seed have opened a whole new market in the world of the online grow-shop, making it easy for home growers with shortage of space to grow rewarding cannabis plants in many different varieties. To grow plants indoors, a growing medium (e.g. soil or growing Potting soil, irrigation (water), fertilizer (nutrients), light and atmosphere need to be supplied to the plant.
Auto-flowers have been rising in popularity fast and there are now auto flower growers communities. These Web properties allow users to get information on how to grow these non photo-sensitive plants and what are the best practices when producing and germinating auto-flower seeds.
Selecting Suitable Parents Edit
There are a number of important characteristics when selecting parents. First are you making fem seeds? If you are then both parents will be female. This makes things easier. If not then the best you can do is select a male with characteristics in common with the females you hope to achieve from the seed.
Obviously potency, yield, and psychoactive effects are critical to the selection process. But some other important traits are size, odor, taste, resistance to mold and contaminants, early finishing and consistency.
Collecting and Storing Pollen Edit
In order to collect pollen you simply put down newspaper around the base of the plant. The pollen will fall from the plant onto the newspaper. You can then put this newspaper into a plastic bag and store it in the refrigerator or freeze it. Pollen will keep for a few months in the refrigerator and can be used on the next crop. Filtering the pollen through a silkscreen, drying, and freezing can extend viability for decades. At least one reader indicates success using pollen treated in this manner and stored at -30 c for 17 years. The chance of viability does decrease with time, even in the freezer, so the more fresh the pollen the better. Wrapping the pollen in a layer of aluminum foil and then a layer of plastic should help to protect it from freezer burn. Additionally, oxygen evacuation such as with a heavy gas like nitrogen or vacuum sealing should provide additional assurance of preservation.
Pollinating a Plant Edit
To pollinate a plant you can brush the pollen on a flower with a cotton swab or you can take the plastic bag, then wrap the flower inside it and shake, trapping the pollen inside for easier transportation. In this way you can selectively pollinate plants and even individual buds and branches.
Male Isolation Edit
A male plant or a plant with male flowers will pollinate your entire crop rendering it seedy. You probably don’t want THAT many seeds so how can you avoid it? Moving the male to another room might work but if that other room shares an air path via ducting or air conditioning then pollen may still find its way. One technique is to construct a male isolation chamber.
A male isolation chamber is simply a transparent container such as a large plastic storage tub turned on its side (available at your local megamart). Get a good sized PC fan that can be powered with pretty much any 12v wall adapter, by splicing together the + (yellow or red on fan, usually dotted on power adapter) and the – wires (black on fan, usually dotted power adapter) just twist with the like wire on the other device and then seal up the connection with electric tape. Then take a filtrate filter and cut out squares that fit the back of the pc fan so that the fan pulls (rather than pushes) air through the filter. Tape several layers of filter to the back of the pc fan so all the air goes through the filter. Now cut a large hole in the top of the plastic container and mount the pc fan over top of it so it pulls air out the box. You can use silicon sealant, latex, whatever you’ve got that gives a good tight seal.
This can be used as is, or you can cut a small intake in the bottom to improve airflow. Pollen won’t be able to escape the intake as long as the fan is moving but you might put filter paper over the intake to protect against fan failures. You can also use grommets to seal holes and run tubing into the chamber in order to water hydroponically from a reservoir outside the chamber. Otherwise you will need to remove the whole chamber to a safe location in order to water the plant or maintain a reservoir kept inside the chamber.
Making Feminized Seed Edit
To make feminized seed you must induce male flowers in a female plant. There is all sorts of information on the Internet about doing this with light stress (light interruptions during flowering) and other forms of stress. The best of the stress techniques is to simply keep the plant in the flowering stage well past ripeness and it will produce a flower (with seed).
Stress techniques will work but whatever genetic weakness caused the plants to produce a male flower under stress will be carried on to the seeds. This means the resulting seeds have a known tendency to produce hermaphrodites. Fortunately, environmental stress is not the only way to produce male flowers in a female plant.
The ideal way to produce feminized seed through hormonal alteration of the plant. By adding or inhibiting plant hormones you can cause the plant to produce male flowers. Because you did not select a plant that produces male flowers under stress there is no genetic predisposition to hermaphroditism in the seed vs plants bred between a male and female parent. There are actually a few ways to do this, the easiest I will list here.
Colloidal Silver (CS) Edit
This is the least expensive and most privacy conscious way to produce fem seed. CS has gotten a bad name because there is so much bad information spread around about its production and concentrations. It doesn’t help that there are those who believe in drinking low concentration colloidal silver for good health and there is information mixed in about how to produce that low concentration food grade product. Follow the information here and you will consistently produce effective CS and know how to apply it to get consistent results.
Simply construct a generator using a 9-12 v power supply (DC output, if it says AC then its no good) that can deliver at least 250ma (most wall wart type power supplies work, batteries are not recommended since their output varies over time). The supply will have a positive and negative lead, attach silver to each lead (contrary to Internet rumors, you aren’t drinking this so cheap 925(92.5%) Stirling silver is more than pure enough. You can expose the leads by clipping off the round plug at the end and splitting the wires, one will be positive and the other negative just like any old battery. Submerge both leads about 2-3 inches apart in a glass of distilled water (roughly 8 oz). Let this run for 8-24 hrs (until the liquid reads 12-15 ppm) and when you return the liquid will be a purple or silver hue and there may be some precipitate on the bottom.
This liquid is called colloidal silver. It is nothing more or less than fine particles of silver suspended in water so it is a completely natural solution. It is safe to handle without any special precautions. [ citation needed ] The silver inhibits female flowering hormones in cannabis and so the result is that male flowering hormone dominates and male flowers are produced.
To use the silver, spray on a plant or branch three days prior to switching the lights to 12/12 and continue spraying every three days until you see the first male flowers. Repeated applications after the first flowers appear may result in more male flowers and therefore more pollen. As the plant matures it will produce pollen that can be collected and used to pollinate any female flower (including flowers on the same plant).
Silver Thiosulfate (STS) Edit
Silver Thiosulfate is a substance that has similar principle, application and results of CS, but is more difficult to make. STS is more difficult to acquire, but it can still be obtained directly from a chemical supply company. STS is not an expensive or controlled substance.
Gibberellic Acid (GA3) Edit
This is probably the most popular way to produce feminized seed, but at the same time the least effective. GA3 is a plant hormone that also causes the plant to stretch uncontrollably. It can be purchased readily in powdered form, a quick search reveals numerous sources on e-bay for as little as $15. Simply add to water to reach 100ppm concentration and spray the plant daily for 10 days during flowering and male flowers will be produced.
Cannabis growth stages breakdown
Growing cannabis can seem easier when the process is broken down into the 4 main cannabis growth stages. These are the cannabis seed germination, seedling, veg and bloom. At each stage the requirements for nutrients, light and water will vary. The experienced cannabis grower will know how to give the right environmental conditions at each of the stages of cannabis growth. However cannabis plants will always teach you something new to improve the way you grow. Dive into this guide to learn all you should know about the life cycle of cannabis!
|●||How long is a cannabis full grow cycle on average?|
|●||Cannabis germination stage (2-10 days)|
|●||Cannabis seedling stage (2-3 weeks)|
|●||Cannabis vegetative stage (3-15 weeks)|
|●||Cannabis flowering stage (7-14 weeks)|
|●||Other important cannabis life cycle considerations|
How long is a cannabis full grow cycle on average?
There are 4 main stages of the cannabis life cycle as it transitions from seed to harvest. Germination is often defined as the time taken from planting the cannabis seed to the point where it has produced it’s first cotyledon leaf pair. These are the first ‘baby’ (non-serrated) leaf set which is formed as the seed germinates.
|Cannabis growth stages||Average duration|
|Germination stage||2-10 days|
|Seedling stage||1-3 weeks|
|Vegetative stage||1-15 weeks|
|Flowering stage||7-14 weeks*|
The cannabis plant life cycle for a fast growing autoflower seed variety such as as Auto Blueberry or Auto Blackberry Kush could be as little as 9 weeks from seed to harvest.
Or it could be a 6 months cannabis life cycle for an outdoor seed variety. The indoor cannabis grower has full control over their plants and the environment. This allows indoor feminised seed growers to dictate the length of vegetative growth, which in turn will affect final plant size, yield and overall life cycle.
The length of the cannabis full grow cycle will depend on your choice of cannabis seeds (autoflower seeds vs feminised seeds) and whether you grow them indoors or outdoors.
|Autoflower seed vs feminised seed outdoor cannabis growing|
Cannabis germination stage (2-10 days)
Cannabis seeds are typically small, hard and dry. The colours vary from light to dark brown. The first cannabis plant stages take place after the seed has germinated. During seed germination the shell of the seed is initially softened by the moist germination conditions. It’s important to provide moist, but never soaked, conditions for cannabis seed germination in order to achieve maximum germination rates from your precious seeds.
Cannabis seeds should be germinated in dark conditions and don’t need any nutrients initially. Water is sufficient for the first few days. The tap root will emerge from the cannabis seed and grow downwards. The first set of cotyledon leaves will emerge and the cannabis grow cycle has begun! Note that these leaves don’t have the ‘normal’ serrated edges which you will see on all subsequent leaves. As all this is happening the cannabis root system starts to form.
It can take around 2-10 days for seed germination to occur. Occasionally, cannabis seeds can take up to 2 weeks to germinate. Eventually you will see the first set of ‘true’ cannabis leaves with serrated edges appear. For many growers, this represents the end of the cannabis germination stage and the start of the seedling stage.
|Dark vs white cannabis seed germination test|
How long does it take to germinate cannabis seeds?
It can vary from one cannabis seed to another. Usually you can expect seeds to germinate somewhere around 2-10 days after you begin the germination process. Occasionally you can get cannabis seeds to germinate in just one day. Sometimes it can take around 2 weeks. But usually you can expect to wait around 2-10 days for your cannabis seeds to germinate.
Can you speed up the germination process?
Not really. You need to provide good cannabis seed germination conditions and then wait for nature to do her work. If you have bought good quality cannabis seeds from a proven supplier than you can expect cannabis seed germination rates of 90%+.
Many growers have accidentally killed their plants during germination by trying to speed things up by a day or two. It definitely isn’t recommended to e.g. sand-paper your seeds to reduce the shell thickness in an attempt to speed up germination. Nor is it recommended to try to force the shell off the plant during germination. Instead, just be patient and allow the cannabis genetics to do their work.
When to transplant cannabis seedlings?
If you have germinated your cannabis seeds with the moist cotton pad method then you will simply place the germinated seedlings in your grow medium (e.g. soil or coco fibre) or your grow system (e.g. DWC or NFT hydroponic system).
Many growers that use e.g. autoflowering cannabis seeds will simply put their seedling into the final grow container. This avoids the need to repeatedly transplant the seedling to progressively larger containers. In the case of an autoflower strain with a limited lifetime, this process allows the auto to focus all the available time on growth. No plant time is spent adapting during repeated transplants, allowing your auto to reach maximum potential.
Those that grow photoperiod feminised seeds indoors can choose when the blooming process starts simply by reducing daylight hours. That gives them more time to spend progressively potting up and transplanting into gradually larger containers if they wish.
|Cotton pads germination video tutorial|
Cannabis seedling stage (2-3 weeks)
For the next 2-3 weeks after germination, the cannabis seedling will grow. The cannabis root system is essential for healthy growth and development. Experienced growers aim to deliver fully optimised grow conditions in order to maximise root growth. Give the roots waterlogged cold soil and they won’t grow well, this may result in a permanently stunted plant.
Above ground, the cannabis seedling will continue to grow. With each new set of leaves you may notice progressively more ‘blades’ or fingers on the leaves. Initially you may see 3 fingers, then 5 or 7 etc. During the life cycle of cannabis, the seedling needs less water and nutrition than it does in subsequent veg growth and flowering stages. This is one of the most delicate cannabis growing stages. The seedling needs little water and minimal nutrients.
If growing in light mix soil there you may not need to consider any grow nutrients until a week after the first set of serrated leaves emerge. Generally, a light mix soil has enough nutrition for the first couple of weeks after cannabis seed germination. After that many growers use root stimulator and grow nutrients.
If you are growing in hydroponics or coco fibre you may already be carefully using very light nutrients on young seedlings. You may prefer to use specialist low strength seedling nutrients at this stage. The goal is to keep the cannabis seedling in the nutrient sweet spot without over feeding or underfeeding. If seedlings are given excessive nutrients it can ‘burn’ the plant, permanently limiting future growth.
|Everything you need to know about cannabis roots|
How long does the cannabis seedling stage last?
Many growers consider the first 2-3 weeks after germination to be the cannabis seedling stage. These are the first couple of weeks where the seedling is most vulnerable. The seedling may only be a few inches/cm tall with a couple of sets of true (non-cotyledon) leaves.
Lighting levels don’t need to be particularly intense for cannabis seedlings, for the technically minded PPFD levels of 200-400 should be adequate. Many use T5 fluorescent tubes for cannabis seedling lighting. The delicate young seedling leaf tissue can be damaged by the intense light levels which you will need in later cannabis flowering stages.
If you do see your cannabis seedlings stretching a little too much it can help to reduce the distance between the plants and the light. With higher light intensities, the stretching should reduce. If your seedling suffer elongated stems you can gently prop up your seedling with some small wooden supports, such as toothpicks (or similar)
What does a healthy cannabis seedling look like?
You can expect a short, squat plant. The cotyledon leaves will be small in comparison to the emerging ‘true’ leaves and you will notice new leaf sets emerging from the central growing point of your plant (the ‘apex’). The colour should be a vibrant green. Any signs of yellowing is a signal that something is wrong. If your seedling has brown leaf tips it’s a sign that you have overfed your seedlings and ‘burned’ the plant. This is never a good sign and can temporarily or permanently restrict future growth.
If you have a healthy cannabis seedling it will have all the basics in place for future growth. The roots should have the space and nutrients/minerals required to grow a larger frame. The leaves will be ready to grow and absorb more light which will power future photosynthesis. Your plant is set for vegetative growth and will be ready for more light, nutrients and water.
Autoflower seed growers may already have their plant in the final grow container at this stage.
|Top 10 germination and seedling mistakes|
Cannabis vegetative stage (3-15 weeks)
Vegetative growth is the indoor cannabis growing stage where roots, branches and leaves grow but no buds are formed. Indoor growers often use 18-24 hours of daily light whether they are using autoflower seeds or photoperiod feminised cannabis seeds.
During vegetative growth the cannabis plants gradually grow in both height and width. Nitrogen rich nutrients are particularly useful in the vegetative growth stage. The first sets of cannabis leaves grow gradually larger and new leaf sets are formed. As the plant grows it’s requirements for nutrients, water and light will all increase. Light levels can be increased from around 200 PPFD to nearer 400-600 PPFD – your light manufacturer should be able to detail the PPFD levels at various hanging heights.
How long should a cannabis plant stay in veg?
Those growing photoperiod feminised cannabis seeds can select the length of the vegetative growth stage. Often it’s around 4-6 weeks for many growers. But some growers, e.g. SCROG growers (Screen Of Green method), prefer very long periods of ‘veg’ growth, in extreme cases up to 15 weeks or so. However, SOG growers (Sea Of Green method), may not give their plants any veg growth and instead put them straight into bloom conditions.
Those growing autoflower seeds will not be able to dictate the length of the vegetative growth phase. Instead the autoflower seed genetics will determine the point at which it automatically transitions from veg to bloom. It does this without any change or alteration to the light cycle. Autoflowering cannabis seeds grow from seed to harvest under the same light cycle, typically 20 hours of daily light. Photoperiod feminised cannabis strains only commence bloom when indoor light hours are reduced to 12 per day.
|SOG vs SCROG cannabis growing|
How does a healthy cannabis plant in veg look like?
Much depends on the length of time the plant has been in the vegetative growth stage for. A feminised strain with 15 weeks of veg growth could have filled a very large SCROG screen. Whereas an autoflower plant in veg may be perhaps 10-20cm tall, perhaps 3 weeks old and ready to start stretching once bloom begins. Much depends on your cannabis genetics and grow style. But you can expect to see a medium-sized plant with healthy green foliage, but no buds.
Why does my cannabis plant want to flower in the vegetative stage?
The cannabis flowering stage follows veg growth. Cannabis plants are genetically geared towards bloom. It’s the only chance for cannabis to produce seeds and produce the next generation of plants. You may see pre-flowers at the nodes between the stem and branches. Autoflower genetics don’t hold back. As soon as they are ready, autos start to transition from veg to bloom. During this process the auto exhibits features of both veg and bloom.
Cannabis flowering stage (7-14 weeks)
During the cannabis flowering stages, the female plant produces buds and resin. The flowering stage follows the vegetative growth stage. When growing autoflowering cannabis seeds, the transition from the vegetative stage to the flowering stage happens automatically (hence the name, autoflowering).
When growing photoperiod feminised cannabis seeds, bloom begins indoors when the daily light hours are decreased to 12. Outdoors, feminised strains sense the shortened daylight hours as autumn/fall approaches and bloom begins. However if you are growing at equatorial regions the plants can sense the short days immediately.
During the cannabis flowering stage, the plant will require gradually increased levels of nutrients and water. Phosphorus will be required in greater quantities as the plant biochemistry changes. During the cannabis flowering stage the plant biomass can increase dramatically.
Intense light levels can be used in bloom, often with PPFD levels of 600-900. More light can deliver heavier yields. Some professional cannabis growers used PPFD levels of around/over 1000 and may also supplement with Carbon Dioxide to further boost yields.
The length of the flowering stage depends on the genetics. 7 weeks of bloom is required by fast flowering indica strains such as Bubba Island Kush seeds. But a slow blooming Haze may require upwards of 14 weeks in bloom.
The following cannabis flowering stages are shown in week by week pictures, below.
How to tell if a cannabis plant is ready to bloom?
Knowing when your plant is ready to be flipped from veg growth to bloom is one of the most important decisions you will make. But first you may wish to consider a few points related to the timing of the cannabis flowering stage.
• The height of your grow room may be a limiting factor. If you have restricted vertical growing space you may prefer to have minimal veg time.
• Are you growing indica or sativa cannabis seeds? Sativa strains may stretch dramatically during bloom. Take this into account when deciding if your cannabis plant is ready to bloom.
• Growing clones or seeds? Clones don’t always have well established root systems and can take a while to create one before being flipped into bloom.
• Outdoor plants can also be forced into early bloom if you have a greenhouse equipped with blackout blinds. Otherwise, they will choose their own moment to bloom as daylight hours shorten.
• Which growing method are you using? If using the SCROG method you may wish to wait and give the plant a long veg stage. If using the SOG method you may want to offer minimal veg time or even none at all and grow from seed to harvest under 12/12 light
• Which region/climate are you growing in? If you’re growing in tropical equatorial regions you may want the most sativa dominant strains with the most stretch. That’s because the plants go into flowering more-or-less immediately. In more temperate climates, the plants commence bloom as daylight hours shorten. For Northern Hemisphere growers (Europe, USA etc) this often happens around August.
|Power Plant grown from seed to harvest under 12/12 light|
How long does it take for cannabis to start blooming after switching the light cycle?
Once you switch the light cycle to 12/12 (12 hours of daily light) the plant undergoes plant hormone changes as it senses the shorter days.
The plant hormones cause the plant to prepare for bloom. Over the following week or so you will see the changes on the cannabis plant as she gets ready to stretch and produce flowers. You may see female pre-flowers producing a couple of pistils (hairs) at the node between the stem and a branch.
However you can expect to wait 1-2 weeks before you start to see flowers starting to appear. With certain sativa and hybrid strains it can take 3-6 weeks before any significant flower formation.
How does a healthy cannabis plant in flowering look like?
Initially you may notice areas of light green foliage at the eventual points where buds will eventually form. You may also notice the plants stretching, with increased internodal distance.
Growers monitor their cannabis flowering stages week by week. Some like to consider the cannabis flowering stage as 3 separate mini-phases; early bloom, mid bloom and late bloom. As your cannabis plant flowers the weight of buds and resin should increase as harvest point approaches.
During the cannabis flowering stage you will notice that your plant appetite for nutrients reaches maximum as it produces bigger buds and more cannabinoid-containing resin. The ratio of required nutrients will change too. Less Nitrogen (N) is required and increasing amounts of Phosphorus (P) and Potassium (K) are needed to support heavy harvests of compact flowers.
During the first few weeks of bloom your plant will stretch. A sativa may stretch to 2-3 times the height it was at the end of veg. You will see increasing amounts of pistils being produced and the buds start to form and eventually fatten up. After around 5 weeks of bloom the cannabis plants have generally stopped stretching and the buds start to get larger.
As harvest approaches, the pistils start appearing as orange rather than white.
How to tell when your cannabis buds are ready for harvest?
Your cannabis seed supplier should give an indication of the approximate length of the flowering stage. This is a guideline rather than a fixed rule and it may indicate the typical earliest harvest point rather than the recommended harvest time.
Environmental conditions and the specific phenotype will determine the actual harvest date. In addition, you may have a preference for early, mid or late harvested buds.
There are various cannabis bud growth stages. They start small and gradually pack on weight and resin as they grow. Some growers like the slightly heavy effects (and more generous yields) offered by allowing the buds a week or two extra in bloom.
There are different cannabis trichomes stages to consider. Immature buds tend to have clear trichomes. As the buds approach harvest the trichomes become cloudy and eventually start to produce amber (or even red) colourations. Many harvest their buds as the trichomes are transitioning from clear to cloudy.
|Understanding cannabis trichomes|
What to do in case of early or late flowering?
If your plant flowers early you can look forward to an earlier harvest. A late flowering plant will generally have enjoyed more time for veg growth, so you may be able to look forward to a heavier harvest.
When growing autoflower seeds you may find some plants will be ready to harvest a week or two before the slower phenotypes. Remember each plant is different. Try to time the harvest so that you have buds of the perfect maturity level for your personal tastes. Some growers love the lively energetic buzz from an early harvested plant. Other growers will always wait an extra couple of weeks to ensure that their plants have a high proportion of amber trichomes which can produce heavier effects.
What really matters to the home grower is that they:
• are growing the best cannabis seeds for them personal needs and,
• they select the optimised harvest date which provides maximum enjoyment and satisfaction for their recreational or medical needs.
Other important cannabis life cycle considerations
There are different cannabis growth stages as well as different cannabis flowering stages. The experienced grower understands the various environmental, nutrient and lighting requirements at the various stages of cannabis growth.
What stage of growth does cannabis produce trichomes?
This can depend on the specific cannabis seeds being grown. Trichomes can be seen even on young plants though they can be microscopically small. As the plant matures the amount of trichomes increases dramatically. When growing photoperiod feminised cannabis seeds you may see the first trichomes around 3 weeks into bloom. Over the following month trichome production is heavy and gives the plant a frosty appearance, as if sprinkled with sugar.
When growing autoflower seeds, trichome production tends to start around 4 weeks after germination. In the following weeks, trichome production steps up a gear as the buds gain weight. Aroma also increases as more and more trichomes are produced.
What stage of growth does cannabis stop growing?
During flowering, most photoperiod cannabis plants stop stretching after around 4-5 weeks. After that point most of the growth happens on the buds. For autoflower plants, stretch tends to stop around 6-7 weeks after germination. At that point the bulk of the plants energy is focussed on bud growth and resin production.
But it’s worth adding that these figures are only approximate. Much depends on the specific cannabis genetics that you are growing, your environmental conditions and the grow method.
How long should the harvested buds be left to dry?
Harvested buds are typically left for 7-14 days to dry before being transferred to the curing jars. When the branches ‘snap’ (rather than bend) it’s an indication that the plant is dry enough for curing to begin.
How long should the harvested buds be cured?
Many would say that a month or two is a realistic minimum to allow the taste and aromas to fully develop. Keeping your cured buds in jars even longer isn’t an issue. Many people feel that a 6-month cure with your jars in cool/dark conditions is a great way to maximise taste and aroma.
How to keep a consistent cannabis growth timeline?
When growing photoperiod feminised cannabis seeds the growth timeline is up to you. You can offer minimal veg growth for a SOG grow or several months for a SCROG grow.
Autoflower seeds, on the other hand, have a cannabis growth timeline of their own. They, not you, decide when to start blooming. Good quality auto seed suppliers should be able to give you a good idea whether they are likely to have a growth lifecycle as fast as 9 weeks e.g. Auto Blueberry seeds or a slow growth lifecycle of 12-15 weeks e.g. Auto Ultimate seeds. Note that the autos which take longer to grow may well deliver very heavy yields.
Outdoor cannabis growers should note that the different regions you live in can also determine how many daylight hours per day you will have. That will have a huge influence on your outdoor cannabis lifecycle (or growth stages). Equatorial cannabis growers have 12/12 light (or thereabouts) almost all year round. This means you won’t have any veg time at all if you grow outdoors.
Understanding the cannabis growth stages is key
With an increased understanding of the different cannabis growth stages you will find your control and enjoyment of cannabis cultivation will increase. As well as optimising your grow environment and improving your understanding of the cannabis grow cycle be sure to select the best cannabis seeds for your personal grow situation. The choice of cannabis seeds may seem large and possibly confusing.
If so please check out the Dutch Passion Seed Finder which asks a few simple questions before recommending the seeds which best fit your needs.