Prepare your houseplants for winter. Many of us like to give our indoor houseplants a summer vacation outside, but the summer break is about to end. It’s time to bring those plants back inside. During the summer you might have found that your plants grew a lot, and errant branches are in need of a little pruning. Herbaceous plants can simply be pinched back, but use clippers on woody stems. Be sure to remove any stems or leaves that are dead or diseased. Repot plants whose roots are growing out of the drainage holes or are at the soil’s surface. Select a container that is only one size larger than the old one; otherwise top growth may be retarded while the roots try to fill up the extra space.Clean the leaves of dust and dirt that gathered during the summer. This covering can interfere with a plant’s ability to turn light into food. A gentle spray from the garden hose and a light wipe with a sponge are usually adequate. A light application of insecticidal soap is a wise precaution before bringing your plants back inside, even if you haven’t seen evidence of pests. Spider mites and other pests thrive in a dry, heated house and will multiply rapidly, if present.Once they're inside, locate your plants where they will receive as much natural light as possible. When you water them, do so thoroughly but less often in winter than you did in the summer.