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Overwatering: wet roots that can’t get air
Drooping or yellowing leaves on a pot that still feels heavy usually mean the roots are too wet. Don't water or feed…
Underwatering: a light pot and a limp plant
A limp plant in a pot that feels very light probably just needs water. Water it slowly until the whole pot is…
Heat stress: when the tent is running too hot
Wilting or curling on a plant with moist roots, in a tent that runs hot, may be heat stress. Measure the temperature…
Nutrient burn: brown tips and edges from too much feed
Brown, crispy tips or edges after a stronger feed may be nutrient burn, but other problems look the same. Test before you…
Aphids: clusters and sticky leaves
Clusters of small soft insects on stems and under leaves, often with sticky or shiny residue, mean aphids. They can be knocked…
Whiteflies: a white cloud when you shake the plant
Tiny white insects that fly up when you water or brush the plant are whiteflies. Keep a yellow sticky card nearby and…
Caterpillars in buds: corn earworm and what follows
Tunnels, droppings and wilting tips in flowering buds usually mean caterpillars, often corn earworm outdoors. Check buds by hand from the start…
Bud rot: brown, dying buds and gray fuzz
A browning, dying section of bud, sometimes with gray fuzz, usually means bud rot. It can't be cured and it often starts…
Root rot: brown roots and a plant that keeps declining
Wilting or stunting that watering and feeding don't fix, with brown or decaying roots, points to root rot. Check the roots before…