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The simplest form of propagator would be a waterproof box with clear plastic sheeting over the top. The advantage of shop-bought propagators is that they often have built-in heating and/or vents in the cover to allow temperature and humidity regulation. They also usually allow more light to reach the seedlings.
The best conditions for cannabis seedlings are a bright, warm (21-23ºC) and humid environment with moving air.
Read this article to learn about the best conditions for your cannabis seedlings. Learn about optimum temperatures, light exposure, air conditions, and the equipment you’ll need to get the best possible results.
Propagators are simple to obtain and provide an ideal start for young cannabis plants. A propagator is a plastic tray with a transparent top which holds in humidity and warm air while allowing seedlings to receive light. This an easy way to maintain a good environment for very young seedlings . However, since the cover prevents normal air movement (which is very important as it encourages young plants to grow strong stems), cannabis seedlings should not be kept in a covered propagator for too long.
Once the young plants produce their second or third pair of serrated leaves, or if they grow taller than about 7 cm with only the first pair, the cover of the propagator should be removed. A small oscillating fan on the lowest setting is a good way to give indoor plants the air movement they need, while outdoor plants can start to receive the natural outdoor air movement when they have reached this size.
After seeds are sown in the growing medium, they can be placed in a propagator for the first couple of weeks.
If the seedlings are intended for outdoor growing, the covered propagator should be placed next to a window to give the seedlings light. By the time outdoor seedlings are big enough to have the propagator’s cover removed, the process of acclimatizing them to outdoor conditions can begin (weather allowing).
Once the seed sprouts in a glass of water or paper tissue it already has the taproot growing out of the cracked seed hull. While transplanting the germinated seed it is very difficult, indeed impossible, to prevent damage to the delicate taproot. Many sprouted seedlings handled in this way show retarded development, or even simply fail to appear out of the substrate after transplantation. Handling seedlings this way can impair the health & vigour of the plant for the duration of it’s life cycle – especially if other disturbing factors occur during the early stages of growth.
If you germinate your seeds at room temperature, and have properly watered the substrate, there is no need to be concerned that it will dry out overnight. Only the substrate requires sufficient water for the seeds to germinate – the outside humidity can and should be be low to moderate (i.e. max. 55%). Low humidity in the room does not interfere with germination or healthy seedling growth.
Germinating cannabis seeds is not difficult.
We provide the basic information and many hot tips on what is important to support you in having a successful start!
A longgrow super cloche has a rugged steel frame covered with corrugated PVC. It withstands extreme weather and is therefore a good choice for protecting seedlings if you are growing in an area with stormy weather during springtime. The ventilation is regulated by circular panels at the rear ends.
IMPORTANT: Don’t cover pots with plastic wrap, don’t use a humidity dome to seal off the pots, or place pots/rockwool cubes in a propagator that’s completely covered! This prevents fresh air exchange, raises humidity to excess levels, and easily facilitates the spread of fungus. The seeds will rot before they can germinate. Excess humidity combines with lack of oxygen is the #1 cause for poor germination results!