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Light burn?
Hashyanswered grow question 3 years ago
Hi there. I grow in rockwool and hydroton as well at the moment. With rockwool it has a naturally high ph I think around 7 or 8. I normally soak mine in ph 4.5/5 water for 24hrs then shake a lot of the water out. Then I soak in mild nute solution for 15mins Ec 0.45 ph 5.5 then shake, then place my seed in the hole. With the hydroton especially if it's new I give that a mega rinse to get the dust off then soak that in ph 5.5 for 24hrs. If its hydroton I used before, I jet wash the roots out and then boil the rocks before soaking in ph 5.5
GMSgrowsanswered grow question 3 years ago
Did you ph/buffer your rockwool before planting seed into it? If not the the ph of the rockwool may be off some as well.
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Robertsanswered grow question 3 years ago
You need cal mag in your solution. About a 1ml to liter. Plus if plants were not stretching badly you were in a good spot before with the light. Light is suppose to intensify through vegging, in flowering is when it is strongest. 🌱👍
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