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'Sunset Velvet' is a brighter cultivar of Copper Velvet Shamrock (Oxalis siliquosa, formerly O. vulcanicola), possibly the most beautiful of all oxalis species & varieties, shown in this April morning photo with dew on its leaves.

Hostas and Oxalis (Golden Oxalis is the common name). Oxalis is a good plant for a shade garden. - by: Glenna Partridge Garden Design

Turquoise wicker chair and yellow bistro table on paved patio with plants in terracotta pots next to classical styled glass door - Hosta, Ilex aquifolium, Impatiens and Oxalis

from Better Homes and Gardens

The Best Summer Bulbs

Oxalis Also called shamrock, Oxalis regnellii bears clover-shape leaves (which are a stunning purple color in many varieties), and delicate pink or white flowers on a 10-inch-tall plant. Easy to grow, it thrives in sun or partial shade and is an excellent choice for container gardens. How to Grow It: Oxalis grow best in full sun or part shade and moist but well-drained soil. Zones 8-10; in cooler areas, dig and store them in a frost-free place for winter.

Purple Shamrock - Best in shade as front-of-bed edging or ringing a shade shrub such as hydrangeas or rhododendrons. Also nice in a shady flower pot. Companion plants: Under Ferns, Cimicifuga or Variegated Solomon’s Seal.