The start often determines the entire grow result. Those who mess up germinating cannabis seeds usually face more problems than necessary later on. Yet, germination is not rocket science – if you know what's important.
What actually happens during germination?
As soon as the seed absorbs moisture, it begins to swell. Enzymes are activated, stored nutrients are mobilized, and cell division starts. The seed coat opens, and the taproot emerges – it immediately seeks purchase and moisture, while the seedling later orientates itself towards light. Oxygen availability, temperature, and water content directly influence the germination rate. Important: Too much water can harm the process just as much as too little.
Optimal conditions for germination
Three factors matter: warm, moist, but not wet. The ideal temperature is between 20 and 25 °C. Below 18 °C, the process slows down significantly, above 28 °C, the risk of the seed being damaged increases. Moisture is necessary for the seed to be activated – however, it also needs oxygen. Light plays hardly any role in the germination phase, as seeds in nature usually germinate in the dark underground.
Method 1: The paper towel method
The most well-known method. The seeds are placed between two slightly moistened paper towels on a plate, covered to retain moisture. Advantage: Progress is visible at all times. The first roots usually appear after one to three days. Important: Keep the paper moist, but not soaking wet – if water collects, the risk of mold increases.
Method 2: Germinating directly in soil
The most natural method: The seed is placed directly one to two centimeters deep in moist substrate. Advantage: no transplant stress, the root develops directly in the medium. Disadvantage: You don't see if and when the seed actually germinates – patience is a must here.
Method 3: Germinating in water
Some people first soak the seeds in lukewarm water for 12 to 24 hours to soften the seed coat. A practical side effect: Viable seeds usually sink after a few hours, while sterile seeds often float on the surface – a simple test of viability. Important: Do not leave the seeds in water for too long, as prolonged soaking can block oxygen supply and lead to rotting.
Method 4: Rockwool for hydroponics
Those who grow in a hydroponic system are well served with rockwool. The seed lies on a suitably cut piece, which is kept slightly moist. The advantage: excellent aeration and uniform water absorption, which fits the rest of the setup particularly well in hydroponic systems.