Oxalis plants, also known as shamrock plants, are members of the wood sorrel family and are not related to true shamrocks. They were given this name because of their clover-shaped foliage. Oxalis leaves can be found in colors of green, purple, red or a combination of these colors. White, yellow, pink or red flowers appear once or twice per year. Oxalis is almost exclusively grown indoors, where it is easy to care for and requires minimal maintenance to thrive.