The so-called mother-in-law tongue, or snake plant, is classified as Sansevieria trifasciata. Part of the large agave family, snake plant has thick, succulent leaves that point upward and dark green markings resembling a snake. Rising to popularity in the 1930s, this plant makes a carefree houseplant that will live for many years. In areas with mild winters, it can be grown outdoors. Plants often produce offsets, or side shoots, when they become root-bound, which is a good time to separate these baby plants and give the older plant more room to grow.