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cannabis seed propagation temperature

Our first recommendation, as we already said, would be to wait for the good weather to settle in. Having a high temperature (from 22 to 26°C) is an important factor for your seeds to decide to emerge into the world.

– Another advantage is the specific temperature: water has a low specific temperature. This means that if we place a glassful of water in a room at 25°, it will be very hard for the water to reach that temperature. Therefore, if we place the cannabis seeds in a very watery medium (a glass or between paper towels) the temperature will be lower, while in a Jiffy, as it is more exposed to the air, the temperature will be higher and the process, faster.

Step 2: choose quality materials.

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

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.

– It has a neutral pH, which is the most adequate and makes it the perfect medium for germination; during one week you just have to add water.

Lots of broscience going on here.

It is important to understand that during a seedlings growth a lot of activity is happening “behind the scenes”. This means that in this growth phase the seedling is primarily focused on developing a root system while above-ground growth appears slow. New growers often think they are doing something wrong so they tend to over-water or over-fertilize at this point. Little do they know the plant is speedily right on track.
The new developing fragile root system requires an optimum constant supply of water and warmth. Too much water and you will drown and rot your roots. Too little water and your fragile root system will dry up.
The seedling growth stage lasts for about two to three weeks after seeds have germinated.

This is a great little trick. As soon as the sprouts emerge above-ground, they should be lightly tapped several times a day. This promotes internal strengthening. After the sprouts have been alive for a week or more, their stems should be gently bent back and forth daily VERY CAREFULLY in order to further strengthen the stems. These first steps are crucial for developing strong healthy plants that produce a big beautiful quality heavy harvest.
After the sprouts have been alive for about two weeks, an oscillating fan blowing enough current to make the stems bend very slightly should be directed across the sprout area.
All of the tactics above will make for a thicker, sturdier stalk that will produce bushier, more productive plants.

Pests, Fungi, & Diseases

Put soil in a pot and pour water until water fully drains out of the bottom of the pot. Poke a hole, around

Transplanting is done when the seedlings are ready to be transferred from their rockwool tray (or other medium) to another grow medium. The process is simple; carefully lift the seedling from the tray still inside the rockwool cube and place it in another medium such as soil or directly into your hydroponic setup. When transferring the seedling to soil – dig a small hole in the soil and drop the
cube in, then cover the cube with soil. If you’re not using a rockwool cube, simply carefully transfer your seedling into a small hole into the soil and bury it.
Note: The cube doesn’t affect your plant’s growth in any way, some people feel it actually helps support the plant.

The Method:
Step 1. LIGHTLY chip/scarify outer seed coat in one place. Emphasis on lightly because if you do it too roughly it will ruin a perfectly good seed.
Step 2. Dampen paper towels and place seeds on it. Either fold or roll it up so that its pressing against the seeds.
Step 3. Put paper towels with seeds inside into an air-tight plastic container.
Step 4. Place in a warm location (i.e. on top of a TV set, VCR, or refrigerator).
Step 5. Open every 12 hours to allow oxygen into the container and check on the seeds. Most should germinate in about 24 hours, but there may be a few that need a bit longer.

The Method: The paper-towel method involves placing the seed(s) onto a damp paper-towel (which is placed on a plate/dish, or similar object), and covering them with another damp paper-towel. Boil some water and run it all over the plate to kill any bacteria or germs. Run some boiling hot water over the paper towel also, but make sure it doesn’t fall apart. Then squeeze the paper towel until it is damp but not dripping wet with water.
It is imperative that you use water that is warmer than room-temperature. This will compensate for any drop in temperature. Next, cover the plate/dish with another plate/dish/bowl (to prevent heat from escaping, as well as protect the seeds from light). The bowl should cover the paper towel so that no sunlight gets in.
Also, using more than one sheet of paper-towel above and below the seed(s) will yield better results, as well as adding more warm water to the papertoweling/bottom dish before covering the whole arrangement with the optional second plate/dish/bowl.
WARNING: It is imperative that the seeds are removed from the paper-toweling as soon as the taproots have emerged. If the seeds are
left to soak for too long, delicate micro-roots can be torn when the seeds are removed from the paper-towel, which will temporarily
retard germination/growth as well as stress the plant (which could possibly result in an unfavorable male or a dreaded hermaphrodite).
WARNING X2: NEVER LET THE SEEDS DRY OUT. Water the cloth and keep it moist. Let the excess water drain away freely and keep it in the dark. The cloth will retain enough moisture to germinate the seed in a few days or so. If fungal attacks are a concern you can water with a mild two-percent fungicide or bleach solution.

Too often the seed is buried too deep (a problem that we have already seen in case of watering after planting the seed), so the seedling may never emerge. In the other case, if we sow too close to the surface, we can find that the seed germinates well but the stem grows weak, bending and not allowing the seedling to develop correctly.

Pothead 2021-05-12
This article has a lot of nonsense in it. From Mandala Seeds: A #1 seed killer is a closed humidity dome/mini-greenhouse. Humidity domes are only required for rooting cuttings. 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! Cannabis is not an orchid or swamp plant! The seeds need a well aerated growing medium to germinate well. Seedlings also cannot tolerate high humidity and can easily be attacked by fungus such as fusarium and pythium. Only the soil or growing medium should be moist for optimal germination and seedling growth. Ambient humidity is best at or below 50%. Btw, seed should be planted with the pointed end UP, not down. Tap root ALWAYS goes up no matter how you place the seed. It's by the nature, goes against the gravity to create a support for itself so it can push the seed out. It you put it with the pointed end down it will have to make double turn loosing the precious energy stored in the seed.

So, you should plant the seed with the tip down and the crown uppermost and facing you. Once the seed germinates the crown will serve as a hinge, so that the seed will open at the tip and let out the root. In case of placing the seed incorrectly, the tap root will grow upward and the seedling downwards, which should be avoided at all costs because it is likely that the seedling will not be born.

Temperature and humidity for germination

Tim 2021-08-16
Hi Master, thanks for your comment. I honestly don’t believe there’s a correct or incorrect way. In our time, we’ve tried germinating seeds point down, point up and also laying them on their side in the soil, and we’ve come to the conclusion that it makes no difference at all – we certainly didn’t see any real difference in the results of one method compared to another. In nature, cannabis seed dispersal doesn’t rely on the seed landing in the soil in any particular position and it’s managed to spread pretty well! That said, if you like to sow your seeds pointy end down, then that’s great, keep doing it your way if it works for you! Best wishes!

Cannabis seeds germinate correctly with relatively high temperature and humidity values. It will be necessary, especially during some seasons of the year, to use some source of heat to get a temperature of about 26-28ºC. For this purpose there are many options on the market, such as thermal cables or heated greenhouses. The latter are particularly interesting because they also provide the perfect high humidity environment for seed germination.

If you look closely at a cannabis seed, you will notice that it has a slightly oval shape, ending in a point at one end and forming a small “crater” at the other end, which is called the crown. When planting your seed (whether it’s a seed that you want to germinate, for example, in a jiffy, or a seed already germinated on kitchen paper that you want to transplant) you must keep in mind that this crown should always be facing upwards.

For this reason, it is advisable to check every day to make sure the germination medium remains moist, especially if a heat source is used to achieve a higher temperature and therefore a better germination rate; the heat will cause the substrate to dry more quickly, something that must be kept in mind to avoid nasty surprises. In case of hydroponic cultivation it is always better to germinate in rock wool cubes, which of course must always remain moist.