Not mold, it's salt! I've seen that commonly on coco and rapidrooters even- you actually get salt crystals building up as the nute solution evaporates off exposed bits!
Feel it... a bit hard? Crunchy, even?
Keep an eye on your plants for signs of stress, fert burn, lockouts... include a flush in your feeding schedule every so often... and beyond that, don't worry too much!
That shit creeped me out to the first time I saw it and then I was like, oh f'real, it must be time to flush!
stinkyattic Reviewed by stinkyattic on . White mold on net pot Hi everyone. New poster here :). I migrated over from GC on the suggestion of a couple of (former) posters over there. I've got 6 plants growing in a drip-feed DWC hydro set up under CFL's. They're on their 24th day of growing now and despite several attempts to kill them (it's my second grow attempt and first time at hydro lol) they seem to be doing well. Three days ago, though, I discovered that one of the net pots had a small patch of white mold growing on the side. The mold is Rating: 5