Stretching often happens when seedlings or young plants try to reach for more light. Even if your light seems strong, a few things could cause stretching:
1. Light Intensity or Distance:
The plants might still be a bit too far from the light or the light intensity isn’t quite enough for their early growth stage. Autos sometimes stretch more than photos because of their genetics.
2. Genetics:
Some auto strains naturally stretch more during early growth. Divine Rapier might be one of those that tends to elongate before bushier growth starts.
3. Temperature:
Your temps around 23-24°C are good, but if night temps dip or fluctuate, plants can stretch more. Also, warmer temps often encourage stretching.
4. Light Spectrum:
Seedlings like blue light to stay compact. If your LED setup has more red or less blue light at this stage, it could encourage stretch.
5. Root Development:
Even if you feed root boosters, roots take time to establish. Until they do, the plant might stretch trying to get more light and energy.
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What to do:
Try lowering the light a bit or increasing intensity if possible (without causing stress).
Keep temps steady and avoid too warm nights.
Be patient—autos often stretch early but then start filling out quickly once branching begins.
Avoid adding too much nitrogen at this stage; focus on root health and balanced feeding