Lengthening the day: Giving some extra light after nightfall is often enough to keep a plant vigorous. This is especially true in the winter, when the days are short. These extra hours of light can be achieved by placing the plant near a reading light in the evening, but not so near that the heat burns the leaves.

Making extra light: If the plant cannot be moved, bring more light to the plant by training a decorator spotlight on it in its present location. This light can be used to extend the day or, if the location is dim, it can be left on all day to brighten the location.

Growing under lights: You can make plants independent of natural light by supplying all their light needs with artificial lighting. Fluorescent fixtures with cool-white bulbs are most practical. Use a reflector to focus the light on the plants. About 15 to 20 watts are needed for each square foot you wish to illuminate. Fix the lights 1 to 2 feet above the tops of the plants, and leave them on for 12 hours a day for foliage plants, and 16 hours a day for flowering plants. Most houseplants can be grown under fluorescent fixtures, but a few that need full sun, such as miniature roses, may not get enough light to bloom.