Many of the houseplants we grow originate in warmer, more humid climates than ours. Now that it’s getting colder and the central heating has been switched on, the air in our homes can become very dry. This can cause the leaves of indoor plants to shrivel or develop brown patches. To keep them in tip-top condition, make sure houseplants have sufficient moisture. Use a mist sprayer on leaves or stand the pot in a shallow tray or bowl filled with pebbles and water – humidity from the water will rise up around the plant. Make sure the pot sits just above the water so the roots don’t get waterlogged.