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Curled, crumbly leaves
Cause: Even a few hours without water can slow a seedlings' growth and after a day the plant may begin to curl its leaves to conserve moisture. Hot grow lights and the dry air inside heated homes can rapidly dehydrate plants, too.
Considering this, why are my leaves curling up?
When the the serrated edges of marijuana leaves curls or tipped up like that, it's often a sign of temperature stress, overwatering/root problems or extreme humidity levels. If this is happening to the plants which are closest to your grow light, that's a hint that the problem may be temperature related.
Subsequently, one may also ask, how do you fix sagging seedlings?
Stick an index finger 1 or 2 inches into the plant's soil. If it feels dry, the plant needs water. If the soil feels moist, another problem is causing the wilting, such as over-watering, too much wind, very bright sunlight, pests or disease. Move the wilted plant out of the sun, if possible.
Leggy seedlings happen for the same reason crooked houseplants happen. The plant grows towards the light and, since the light is too far away, the plant tries to accelerate its height to get close enough to the light to survive. Third, seedlings that are falling over can be more prone to disease and pests.