So im new to growing and im using a grow box and ive started to notice one of my plants soil on top is slightly turning white ...is the soil just dry or could it be mold if so any tips on how to prevent and cure my plant .. any tips at all would be helpful
High humidity does not usally show up first in soil. It is a possibility the soil is not draining well. or you are not letting pot completly dry out between watering.