Because they would like some magnesium in their diet.
Dissolve 1/4 teaspoon of Epsom salts in a gallon of lukewarm water and foliar feed with that, or use as an additive to your regular ferts.
stinkyattic Reviewed by stinkyattic on . Quick diagnosis? 1st gro, all the plants look nice except two of them. Pics are attached. Wondering if anyone can take a look and see what the problem might be. 400w MH right now theyre approaching 2 months from seedling, temps vary from 68-78 depending on the time of day. PS Back right and middle front are the 2 problem plants Rating: 5