Some of my plants have these rust colored lines on their leaves. It's only on a few of my Granddaddy Purple plants, and then, only on some of their leaves. So I'm wondering what this is. It's kind of a powder residue, it partly rubs off if you rub the leaves.
Any idea what this is? And how to fix it? A surplus or deficiency of some nutrient? I'm doing a soil grow in Fox Farms dirt with only Fox Farms nutes. Day 20 of flowering after 8 full weeks of vegging time.
Any idea what this is? And how to fix it? A surplus or deficiency of some nutrient? I'm doing a soil grow in Fox Farms dirt with only Fox Farms nutes. Day 20 of flowering after 8 full weeks of vegging time.