Many of our popular house plants originate in tropical regions, so they like warmth (usually above 7°C) and humidity. However, in winter, when we turn on the heating, the air in our homes often gets very dry, and this can cause their leaves to turn brown or shrivel, especially around the edges and tips. This lack of humidity also encourages infestations of red spider mite, which feed on sap, leaving yellow mottling on the leaves and weakening the plant.
Most indoor plants suffer in dry air, but species with thin leaves are at greatest risk. If you grow indoor ferns such as the maidenhair fern (Adiantum raddianum), palms such as Chamaedorea elegans, or prayer plants (Calathea, Maranta), then check them regularly over winter and follow our tips to keep them healthy.