My White Widow has been under lights for just over a week & the first true leaves are looking sickly. First of all the tips turned yellow and the tips were also pointing up. It has now spread down the edges of the leaves and in places is looking brownish
I am growing in coco coir & I have fed it nutes (Coco Canna A + B) 3 times so far at 1/8th strength. I am adjusting the ph to about 6 with phosphoric acid & I water every two days.I didn’t start feeding till about 4 days under the light. For the first week the the plant was under a 125 watt cfl, now it is under a 250 watt cfl. Under the new light it about 4 inches away at 85F. On my last watering I gave it about an 1/8th of a tsbp of Epsom salts since I thought it might be a Mag def. Now I am wondering whether it is wind burn since my other plants went like this in soil & I have a 16 inch fan blowing in a very small closet (now I have turned it down to its 2nd setting). The fan points in the direction of the plant & I have put some card in front of the Widow so it doesn’t blow directly on the plant. It first started to burn at the tip when I closed the closet door overnight so maybe there is too much air flow air in the closet which obviously is made worse by the temps of 85F. I am going to get a hygrometer for the humidity. The light is on 24/0

Read more …