Improper Watering Routine
Either overwatering or underwatering a fuchsia plant can cause its leaves to drop. The fuchsia plant likes to have moist but not soggy soil. Water when the soil volume is 25% dry. Water thoroughly until you see water flow from the drainage hole. Discard any excess water in the saucer to discourage root rot.
Lack of Fertilizer
Fuchsia plants love to be fed. If the fuchsia’s leaves are dropping (or yellowing) this could be a sign that they are lacking nutrients. You can fertilize your fuchsia once a month with a half-strength solution of water-soluble fertilizer.
Sometimes, repeat fertilization can cause salt residue to build up in the soil. This buildup can physically burn the roots, in turn causing the leaves to begin dropping or turning yellow. Try flushing the soil thoroughly with water to make sure all the salt is being leached out through the bottom of the planter.
Sunlight & Hot Climate
The fuchsia could be dropping its leaves due to too much heat or direct sunlight. A fuchsia plant thrives in moderate temperatures and partial or full shade when grown outdoors. If the plant is yellowing with no new growth, no new blooms, or a leggy appearance, this can be a sign it needs more light.
