Oxalis are a group of foliage plants that also produce small ornamental flowers. Commonly called clover or shamrocks, oxalis grows from a small bulb or tuberous root section. These deep green plants produce three leaflets per stem, though there are four-leaf varieties available. The leaves fold closed at night and open back up in the morning light. Plant oxalis bulbs in spring after all frost danger has passed. Grow them indoors in pots or out in the garden bed.
Fill a 6-to-8-inch diameter pot with a well-draining potting mixture. Alternately, spread a 2-inch layer of compost over a well-drained, partially shaded garden bed and work the compost into the top 6 inches of soil to further aid drainage.
Plant the bulbs so that the top of the bulb is 1 inch beneath the soil surface. Space bulbs 2 inches apart in pots and 3 inches apart in the garden bed. Plant approximately three to five bulbs in a pot.
Water the potted oxalis after planting until the excess moisture drains from the bottom of the pot, then empty the drained water from the drip tray. Water bedded oxalis until the top 6 inches of soil feels moist.
Place potted oxalis in a brightly lit area that is not in direct sunlight, such as a south-facing window. Water when the soil surface just begins to feel dry.
Irrigate bedded oxalis once a week, moistening the soil to a 6 inch depth. Foliage grows in within six weeks.