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how to harvest seeds from marijuana plants

Separate or sift seeds over the screen to remove any unwanted plant matter from the seeds themselves. Brush off the seeds—they should be completely free of any remaining plant material such as leaves, stem, or trichomes, as these elements put seeds at a higher risk for contamination and spoilage during long-term storage.

The best way to harvest pollen for storage is to remove an entire male flower cluster and place it in a sealed storage container for several days. After the cluster has dried, place it over a micron screen with parchment or wax paper underneath, and give it a light shake. This will allow the pollen to separate from any remaining plant matter and fall through the screen and onto the wax paper.

When it comes time to use frozen seeds, remove them from their container and let them sit out on a dry surface for several hours. Letting the seeds reach room temperature will help ensure a successful germination.

Collecting Pollen

Cannabis genetics are often sourced from external companies and organizations such as nurseries and seed banks. For the individual grower, saving seeds and pollen removes this reliance on external companies. This is especially true with pollen, as very few (if any) companies offer pollen to the public.

Sometimes a grower has to move on from a certain strain. Maybe you’ve been growing the same strain for a long time and it no longer makes as much money as it used to, or maybe you just want to mix it up and start growing something else and don’t have the space for it.

Cannabis is for the most part dioecious, meaning that the male and female reproductive organs exist on two separate plants (although hermaphroditic plants do occur). It is also a wind-pollinated plant, so pollen must be transferred from a male stamen to a female pistil via the air in order for pollination to occur and seeds to form.

Fresh seeds should have a germination rate close to a 100%, whereas older seeds will see a significant drop off over time in their ability to germinate.

LIGHT: For healthy vegetation marijuana needs over eighteen hours of light per twenty-four hour period. Indoors this is controlled by you with timers. Outdoors germination must be delayed until the plants can be exposed to more than twelve hours of daylight and receive at least eight hours of direct sunlight per day.

Most contemporary plants are topped and under-shucked continually during the whole growth phase. This encourages an even canopy that will fill with homogeneously sized buds during the bloom stage. Cannabis will continue to vegetate while there are more than twelve hours of daylight. The further away from the equator, you are the shorter vegetation time your cannabis will have before starting to flower.

Step 1: Choosing Your Cannabis Seeds

Outdoors you need to pick your time. Know your particular climate well. Have a sun cycle app or chart to make sure you get your timing right. Too early and you risk your plants going into flower immediately, then re-vegging when the daylight increases. This is unwanted. Your flowers will not form properly when blooming begins. Too late and you will have small plants with fewer flower sites.

Blooming, flowering and budding all refer to the same phase of growth for the marijuana plant. The next few months will be exciting times as aromas start to develop. Interesting floral arrangements also begin to emerge that are particular to your choice of strain. The blooming phase has distinctive chapters that are common to all cannabis plants and begin when vegetation finishes.

Cupboard, grow tent or dedicated grow room. Directly in the soil or in pots outdoors. Even in a companion planted garden your marijuana will need to satisfy all these needs to grow well and supply you with high-quality resin soaked nuggets.

After the whole process of germination, growth and flowering, a lot of growers ask themselves when to harvest Marijuana seeds. Usually, the breeders will include a suggested flowering time for each strain, but as a rule of thumb, Indica marijuana plants harvest in 6-8 weeks while Sativa Marijuana plants take 10-12 weeks.

If you meant when to harvest seeds from cross-pollinated Marijuana plants, then the seed will fall from the flower by itself once it is mature and ready to germinate into another Marijuana plant. Usually, as a best practice to harvest Marijuana seeds, some growers wait for the whole flowering cycle to end just as if they were harvesting the flower.

Look for these signs for when to harvest Marijuana seeds

You can also judge the ripeness of the Marijuana by taking a look at the trichomes; or little hairs/crystals on the flowers and surrounding areas of the Marijuana plant. If they are transparent its still too soon, if they are milky white they are ready and if they turn brown they have become over-ripe. It is also advisable to follow the instructions to harvest Marijuana seeds on the packet since most reputable breeders also have a tried and tested flowering time for optimum ripeness, potency and flavour of a Marijuana strain.

You might find our FAQ Submission How Do I Harvest My Plant? useful