Mangaves will do quite well indoors, as long as they receive enough sunlight and are kept at room temperatures above 60 degrees F. For the best color retention, give your plants at least 6 hours of light daily by placing them near a sunny window or under a grow light. During the winter months, when plants are semi-dormant, cut back on watering frequency (see 10 Tips for Keeping Houseplants Healthy in Winter).