Hi my clones have been in cups for about 3 weeks and I noticed on some of my girls the edges are kind burnt/discolored and I’m not sure what the problem is..heat stres? its not nutrient burn I’m sure of that..my other plants look great.
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When do you plan to transplant? Hard to tell from the photo but they seem too large for cups. They may be root bound and struggling to get nutrients. Also, the white spots on your plants are typically a sign of spider mites. I recommend inspecting your plants closely with a microscope (on top of and under leaves) to see if any pests or eggs are present.