With St. Patrick’s Day approaching, many people are tempted to purchase the attractive “shamrock plant,” or may receive one as a gift. What is sold as a shamrock is actually a plant from the genus Oxalis, part of the wood sorrel family. Oxalis regnelli, often sold in March, resembles clover with its three triangular-shaped leaflets and delicate white blooms. A purpleleaf plant in the same family, Oxalis triangular, bearing pale pink to white flowers, is also widely available during this season.

A little plant knowledge goes a long way toward ensuring “good luck” with this charming houseplant. Shamrocks grow from tubers and prefer cool temperatures and bright light. Without sufficient light, stems become leggy and weak. Once the risk of frost passes, these plants also thrive outdoors in partial shade.

Shamrock plants dislike overwatering, which can lead to root rot and the plant will eventually die. In late fall, the foliage yellows and dies back – signaling dormancy. At this point, stop watering and fertilizing, and store the plant in a cool, dark place. When new growth begins, return the pot to a sunny location and resume normal care.

One of the most delightful traits of Oxalis regnellii is the way its leaves respond to light: They open in bright conditions and fold closed at night or on cloudy days — a fun phenomenon for plant lovers to observe.

During my years living in southwest Missouri, Oxalis triangular reliably overwintered outdoors in a protected, partiallyshaded spot. Though high summer temperatures sometimes caused leggy growth, the plant rebounded once cooler weather returned.

With proper care, Oxalis plants can live for many years. They are low maintenance, bloom readily, and offer beauty both indoors and out — making them a cheerful addition to any plant collection.

March Gardening Tip — March is the month often thought of for planting potatoes. While you may have great success planting this month, Missouri weather does not always lend well to planting potatoes. From decay from wet, cool soil and late spring freezes, planting potatoes by consistent weather conditions rather than the date may yield better results. Planting potatoes by consistent weather conditions rather than the date may yield better results. Planting potatoes in containers is an option for early planting.

I enjoy hearing from readers. Contact me with horticulture or other gardening questions. You can reach me at mechamk@ missouri.edu or call 660-542-1792.