I have 2 strawberry cough going in my tent right now. One looks perfect the other has white in the leaves. Definitely not mold. Was told by another member it was calcium deficient when it was young. I flipped both to flower at the same time and the plant that was deficient is obviously a week behind the other one. It also took longer to flower. The big one I had flower in a week. This one took about 12 days. I would also agree with the post above about it being a genetic especially if u ce from seed. FYI I have found my harvest to be alot better from seed I stead of clones. A bit more expensive but the harvest is worth it.