Some types of orchids may drop their leaves due to natural or seasonal factors. Deciduous orchids, like some types of Dendrobium orchids, naturally drop their leaves before winter.
Overwatering is one of the most common reasons why orchids drop their leaves. Most types of orchids should be watered every five to ten days during the summer.
Orchids may also lose their leaves if they aren’t getting enough water. Without sufficient hydration, orchids will struggle to produce healthy leaves and flowers.
Orchid leaves may also drop off if exposed to too much bright, direct sunlight. Most orchids prefer bright, indirect light from east or southeast-facing windows.