The seedling phase is one of the most crucial phases in the life cycle of a cannabis plant. It lays the foundation for their future health and yield. During the first two weeks, the young plants are still very sensitive and need your special attention. Only in this way will they develop into strong, healthy plants with a solid base. To help you do everything right from the start, here
The most important factors in the seedling phase
Light
In the seedling phase, your plants need a lot of light, but less intense than later in growth. Special grow lamps with a blue spectrum are ideal, as this light promotes root growth and a compact plant structure. Make sure to get the lamp close enough to the seedlings, but without burning them. This prevents them from stretching excessively towards the light.
Temperature
Keep the temperature constant between 20 and 25°C. A consistently warm environment is important for the sensitive seedlings. Too high or too low temperatures can quickly stress your plants, which can delay their growth or even kill them. So keep an eye on the thermometer!
Humidity
High humidity, between 60–70%, is ideal during the first few weeks. At this time, seedlings absorb water through their leaves because their roots are not yet fully developed. A small humidity dome or mini-tent will help you to maintain these conditions.
irrigation
Be careful with watering: Over-watering is a common mistake in the seedling phase. The substrate should always be slightly moist, but never waterlogged. It’s best to use a spray bottle to gently mist the seedlings. This way, they get just the right amount of water without risking drowning their delicate roots.
air circulation
Your seedlings also need fresh air to prevent mould and to strengthen their stems. A small fan that creates a light breeze will help your plants develop sturdier roots and stronger stems—important requirements for the later growth phases.
Signs of healthy seedlings
You can recognise healthy seedlings by their vibrant green leaves and even growth. By the end of the second week, they should have developed a few leaves, and the root system should also be starting to take shape. Check your plants regularly for signs of yellowing, wilting or growth problems. Such indications often mean that you should adjust the environmental conditions.
Conclusion
The seedling phase is a particularly delicate time, but also an incredibly exciting one. By optimising light, humidity, temperature and watering, you give your cannabis plants the best conditions for healthy growth. Simply follow the recommendations in the ‘Trinity of Modern Cultivation’ manual from Treez Tools and set your seedlings on the path to a successful and productive life cycle.
Have fun gardening – and don’t forget: patience and care are the best ingredients for a strong plant!
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