The tea tree plant (Melaleuca alternifolia) is an evergreen shrub or small tree native to Australia. Considered easy to grow outdoors in U.S. Department of Agriculture plant hardiness zones 9 through 11, this tropical plant can be grown indoors as well with a bit of extra effort. Tea trees typically produce wispy white blooms in the spring and summer, but may not do so when grown indoors. The plants are sometimes capable of self-pollination, but rely on insect pollinators as well. Your plant may not flower unless you set it outdoors during warm weather, so insects can access it. When working with this plant, remember that, although it has many health benefits when properly processed, raw tea tree oil is toxic, and the plant should be grown well out of the reach of children.