Keeping your houseplants healthy and thriving during the winter months comes down to these five things. First make sure they have enough light. You may have to move your plants around the house during the winter in order to provide the best light situation. Another way to increase light is to add plant grow lights like this Jump Start Light System. It comes complete with stand and light and is easy to set up. Great for starting seeds too. You can also buy grow bulbs that will fit a standard socket. Second, water your houseplants consistently. Regular watering will keep the soil moist. You want to avoid letting the soil dry out completely or keeping the soil soggy. Houses are dry during the winter, which doesn't help your houseplants. Another way simple way to increase humidity is to place your plants on a pebble tray. Make a pebble tray by spreading an even layer of small pebbles in a saucer or shallow pan and then add water. As the water evaporates, it increases the humidity around your plants. Be sure that the bottom of the pot doesn't sit in the water.