Posted on

cannabis seed germination temperature

For indoors: The same but under a grow light, fluorescent or LED. If you have the option of germinating your cannabis seeds inside your home, ideally the light intensity will be high; the less intense the light, the more the seedlings will stretch in search of light and become spindly. If you use a 400 W light ideally it should be 40-45 cm away.

Outdoors we never know what dear mother nature has in store for us; in the same way that your seeds might enjoy a week of good weather and sun, there can also be thunderstorms and low temperatures on the very day they sprout. Not to mention the large variety of birds, snails and other fauna that delight in eating those tender and tasty marijuana seedlings. Bear in mind that during their first moments of life, your plants are defenceless against many dangers that threaten them; therefore, it is your job to take care of your little ones and keep them safe. How? It’s actually quite simple, you can buy mini-greenhouses for germinating or you can use a Tupperware and make holes in it for adequate ventilation, although we recommend the first option.

– It has all the elements necessary to nourish your seed/seedling during the first week; the ideal amount of nitrogen, phosphorus, potassium, calcium and magnesium. Phosphorus and calcium are particularly important for the correct development of roots.

Cannabis types and varieties

– It is sterilised, meaning that we prevent the appearance of fungi (powdery mildew, botrytis, etc)

Today you can find high quality products on the market, specifically designed for germination and which, in addition, are not expensive. What do you need?

– Jiffy 7 is expressly designed for the mega-industrial production of seedlings and does not require fertilisation.

– On the one hand it has the ideal structure, that is, the amount of air and water in the substrate is adequate for germination.

Temperature is a very important factor in sprouting seeds, and it is a commonly misunderstood one. You can buy heating mats to send bottom heat to the seed zone, but an ambient room temperature between 68-85°F (20-29.4°C) is ideal for most seeds. Temperatures lower or higher than that will interfere with germination. If your seeds are from a hot, equatorial region, they may most likely need slightly higher temperatures to germinate properly. Healthy seeds will germinate within 2-7 days of being placed in cubes or peat pots.

Unfortunately sometimes your seeds will not germinate. With high-grade cannabis seeds costing so much money, it is extremely important (and not to mention cost effective) that you pay very close attention to this section. Misinformation and bad technique are often used in cannabis seed sprouting. Fortunately, the information presented here for you is literally what I have found to be the most successful ways of germinating marijuana seeds. This information will allow you to get the highest germination success rates possible.
Cannabis seeds can be stored for up to 5 years in a cool dark place with relatively medium humidity. But they do go bad, so germinate early!!
Note: if you buy your seeds from a quality seedbank, you have a right to expect that close to 100% of them will germinate (if guidelines outlined below are followed) and breed true to the variety you have selected.
For soil simply place your seeds 3/8 of an inch deep in soil. One fresh seed per each pot. Keeping the seeds moist is critical. The water activates hormones within the seeds and begins the enzymatic seed sprouting process.

Cannabis crops grow the fastest and produce the richest, heaviest harvest when they are given a stable optimal growth environment. Stressed plants produce much less than unstressed plants. Examples of common stress factors include, but are not limited to; lack of water, drowning of roots (too much water, ultraviolet light, nutrient toxicities, acidic exposure, overly cold or hot growing conditions (including soil and grow medium temperatures as well as air), photoperiod fluctuation, low light intensity, plant mutilation (from pruning too much or too fast) etc.
Stress will greatly reduce growth. Although in some rare cases stress may actually cause your plant to produce more resin, the slow inhibited odd growth simply outweighs the extra resin advantage. Many new growers make the mistake of removing their plants large green shade leaves thinking that it is allowing light to shine on their lower leaves, enhancing growth. Although this is good logic in theory, it is simply not the case. The aforementioned method will cause growth as slow as molasses and greatly diminish harvest.
Only ever remove leaves that are half damaged by burns, pests, death, or disease. Also do not make the newbie mistake of removing a yellowing leaf to early, oftentimes once the stress is eliminated the plant will regain it’s vigor and health, including it’s vibrant green coloration. For maximum growth enhancement remove only spindly, dimly lit lower branches. This stresses your plants very little and speeds growth of the upper foliage. Stress can also affect your plant’s sex.


These factors are:

Germinating Seeds Placed on a Warm Surface

Oftentimes professional weed growers will use weak solution of nutrition and protection products in the pre-soak, germination and early growth periods for seed growing.
As an extremely advanced example, one experienced veteran cannabis cultivator combines beneficial fungi, nutrients, a catalyst, and B-vitamins in dilute form to pre-treat cubes and ensure proper feeding of the sprouts after they have sprouted. To create this mixture he uses products such as Piranha, h-1 Humic Acid, B52, and Jump Start made by a Canadian company called Advanced Nutrients that sells its products in Europe.
Together these products prevent harmful fungi while providing nutrients, protectants, hormones, growth boosters and vitamins that increase sprout survival, health, and grow rate.
Note: If you are a beginner grower, don’t stress just yet! I just want to give you a complete overview of an advanced germination scenario so you know what to decide on doing in order to tailor to your individual growing needs.
Within a day or two of the time seeds sprout, he will then begin a feed program that provides nitrogen-rich basic fertilization, B vitamin supplementation, beneficial microbes that feed roots, enzymes, and inoculants. He begins gradually increasing ppm basic fertilizer called Advanced Nutrients Sensi Grow Two-Part combined with H-1 humic, Piranha, Voodoo Juice, B-52 and Scorpion
The Jump Start is discontinued when the Sensi Grow starts. He then carefully monitors and adjusts his nutrient mixture ppm and pH in combination with close watch of his plant leaves and growth rates to make sure that he is maximizing growth and later harvest potential.
Again, utilizing the above easier germination methods you can get get incredibly high germination rates. But if you are opting for an elite procedure, it would look something very similar to the above.

A cannabis seedling has 2 leaves that are known as a “seedling leaf”, or “cotyledon.” These leaves function as the seedling’s initial food store while it develops a vascular system for being able to take care of itself. Those are the first leaves that the plant develops and they are rounded in their shape. As the stem grows the leaves spread out and true leaves begin to appear. The little plant at this point in time officially becomes a seedling. Water and heat are critical at this point in the plant’s development.

Three fundamental principles will trigger that first small taproot to appear: warmth, moisture, and darkness. With the promise of moisture, a single root will take shape before slowly developing into the cannabis plant we know and love. In the right conditions, seeds will begin to develop within 12–36 hours of moisture being introduced to them.

Arguably one of the least effective methods, but it is still viable. Incredibly simple to facilitate, beginner growers may opt to germinate their seeds in a glass of water. Half-fill a glass or bowl with water that is approximately 22°C (71°F).


If you don’t like the idea of pre-soaking your soil, you can use a spray to moisten the holes before you plant each seed. With enough moisture surrounding your seeds, you can still encourage a root to develop.

The soil pots will need small holes (roughly 10–15mm deep) for the newly germinated seeds to be placed into. Once the seeds are secure, you will want to place a fluorescent light 13–15cm (5–6 inches) away to encourage growth. Finally, don’t risk overwatering your seeds at this early stage. Use a plant mister to make sure they stay damp but not soaking wet.

Small, fragile, and in desperate need of a helping hand, there are several ways you can germinate your cannabis seeds. All methods have varying degrees of success, with both advantages and disadvantages. It is important to note that even with advanced growing expertise and top-of-the-line equipment, you may still end up with a few failed seeds. This is a natural part of dealing with a living organism. At Royal Queen seeds, we only sell feminized cannabis seeds, so there is no need to worry about removing male plants.