Seedling Damping Off Prevention
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Fungal collapse at the stem base kills young plants overnight and comes down to stagnant humid air more than anything else. A small clip fan and sterile medium prevent almost all cases, and the sanitation checklist at https://calmcbdseeds.com covers tray cleaning between runs. Cinnamon on the soil surface helps a little as a folk remedy. Once a seedling flops over there is nothing to be done for it.