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marijuana seed germination temperature

The paper towel method is also a common way cultivators pop their seeds. Some even use this method with cotton pads instead of paper towels, but the necessary steps are the same.

The environment in which seeds germinate also plays a role in the outcome. While there are several different germination methods, each requires proper moisture, minimal handling, and warm springtime temperatures between 68-72 degrees Fahrenheit.

Gently water the soil with a spray bottle and situate your pots under a fluorescent lamp. Keep seeds away from the windowsill, as the temperature is too volatile for germination. In general, you’ll want to keep the temperature in the range of 70 to 80 degrees Fahrenheit.

How to germinate seeds using paper towels

The downside of water germination is that once they’ve popped, you’ll need to maneuver them into their growing medium manually. This is a delicate process, as germinating seeds are extra fragile, and any harm risks the development of your plants. Make sure to place the seed roots down in the soil when you transfer to a pot.

The best germination method depends on the cultivator’s choice. Here are some of the most common ways to pop your cannabis seeds.

Soil is an easy, more natural method with which to germinate your cannabis seeds. The soil protects the fragile roots from any interference, and soil is, after all, where a cannabis plant would grow in the wild.

Germination is the process that brings a cannabis seed out of its hibernation period and starts the cannabis growth process. Photo by: Gina Coleman/Weedmaps

A practical solution is offered by this portable and easily assembled lean-to greenhouse. It has a heavy-duty galvanised steel framework with zip-on and zip-off heavy-duty UV stabilised PVC covers. The greenhouse is ideal for propagating and hardening off young plants and offers essential protection from frost, weather conditions and pests.

Within 3-7 days the seedlings should appear out of the soil/rockwool cubes.

Things to avoid

Please use high quality soil that is suitable for seedlings (see our SOIL GUIDE for more info), or use rockwool starter cubes for germinating seeds.

A #1 seed killer is a closed humidity dome/mini-greenhouse.

Due to our high standard of pollination, attentive grow methods, and the dedicated hand selection of seed stock for sales, our seeds are always perfectly matured and can be quite large. They also possess a particularly intact and hard seed hull. The robust genetics of our cannabis varieties, and our innovative Deluxe seed production methods, leads to the development of healthy and strong seeds with a good resistance against environmental factors. Due to the firm seed hull and large size some of our seeds may require a slightly longer germination time. Most seeds sprout in record time and others take a bit longer. Once the seedling grows through the substrate it will develop quickly and vigorously regardless of the germination time.

Many growers make the mistake of thinking that they need a high ambient humidity for germination or seedlings. This is an unfortunate myth of cannabis cultivation. The high humidity and lack of fresh ventilation quickly causes fungus in the soil or growing medium and the seeds can rot!

High grade (30 gsm) polypropylene fleece covers these easy tunnels, creating warmth and insulation whilst allowing water and sunlight to filter through – a constant atmosphere is maintained for faster, even growth and protection against frost, strong sunlight and pests.

Often overlooked, it is all too easy to assume that the vegetative and flowering stages of cannabis growth are the most critical parts of the plant’s life cycle. However, with the chance of failure high unless you know what you’re doing, poor planning when it comes to germination can make or break your next grow. Giving your cannabis seeds the best possible start on their journey to bulging buds is a surefire way to encourage a healthy and robust plant.

After 3–5 days, the seeds will start to open, and you should see tiny white tips appear. Once these roots reach 2–3mm in length, use extreme care to transfer them from the water to pre-prepared soil pots.

THE ART OF GERMINATING CANNABIS SEEDS

Maintaining the ideal temperature (between 22–25°C/71–77°F) and moisture for germination is tricky. Leaving seeds out in the open environment or on a windowsill is far from ideal; a DIY climate-controlled cupboard would do a much better service. A warming mat is perfect for maintaining a constant temperature, but it doesn’t tackle the issue of moisture.

Two or three weeks after germination, your young seedlings should be ready for their new home. At this point you have two options; transplanting them into soil pots, or taking on the challenge of hydroponics. You’ll know when the seedlings are ready to be moved because the root system should start to poke out of the bottom of the wool blocks. As long as the roots haven’t begun to engulf the bottom half of the wool block, they will seek out water and nutrients in their new surroundings and continue to grow downwards.

Before we jump straight into the germination methods, there are a couple of germination golden rules. For the best results, we recommend staying within these guidelines, no matter how you choose to germinate. That being said, of all the factors to consider, temperature is one of the most critical. Seeds will always seek out even the smallest amount of moisture, but they use temperature as a sign that they need to do so.