To care for a peace lily, water the plant with room-temperature water once a week to maintain moist but not overly wet soil. Peace lilies grow well in shady areas with diffused natural light, but are also tolerant of artificial lighting. Maintain healthy growth by fertilizing the lily once a month using 20-20-20 fertilizer that is diluted to 25 percent of the recommended strength. To force blooming, move the lily to a dark room or a shady location outdoors.
If the leaves turn yellow, move the plant further away from the light source. Water the plant more frequently if the edges of the leaves turn brown. Protect the plant from cold drafts in winter, and store in the plant in a location with temperatures above 45 degrees Fahrenheit. Peace lilies grow well in temperatures that range from 65 to 80 F.
Repot peace lilies in a combination of sand, peat moss and loam every one to two years, or when the roots are visible on the soil surface. If the broad leaves of the peace lily are dusty, wipe them clean with a damp sponge. Check the lily for pests regularly. If pests are present, spray the plant with insecticidal soap, or wipe the foliage with rubbing alcohol.