what is the humidity? my guess is that its mall amounts of dried up salts from the nutes crusting on top, if it was mold i dont believe it would show up only after it got dry. this could be a sign of build up and you may need a flush, tho i am not the most experienced, i notice it on almost all my house plants after a certain while. hope that helped
Kingpiner Reviewed by Kingpiner on . mold/mildew problem??? i have a problem ive been noticing a couple days after i water. when the top of the soil starts to get a little dry, theres a thin layer of what looks like white powder. i think it may be mold but im not 100% i tried taking pictures but you cant really see it that well cuz the camera sux:( the temps in my room stay around 84-86 and i know thats great temps for mold to grow. is there anything i can do to stop this? if it isnt mold, what is it? its only on the top of the soil and when i rub Rating: 5