High Desert Plant Finder & Guide

annual

Purple Shamrock

Oxalis regnellii 'Triangularis'

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Purple Shamrock (Oxalis regnellii 'Triangularis') at Moana Nursery

Purple Shamrock flowers

Purple Shamrock flowers

(Photo courtesy of NetPS Plant Finder)

Purple Shamrock (Oxalis regnellii 'Triangularis') at Moana Nursery

Purple Shamrock foliage

Purple Shamrock foliage

(Photo courtesy of NetPS Plant Finder)

Plant Height:  6 inches

Flower Height:  8 inches

Spacing:  5 inches

Sunlight:  full sun  partial shade 

Hardiness Zone:  (annual)

Other Names:  Purple Wood Sorrel

Description:

Rich foliage gives a shock of purple color to the garden; covered with dainty little flowers in spring; interesting foliage opens and closes throughout the day; have fun pairing this up with contrasting colors for big impact

Ornamental Features

Purple Shamrock's attractive fan-shaped leaves remain black in color with hints of purple throughout the season. Neither the flowers nor the fruit are ornamentally significant.

Landscape Attributes

Purple Shamrock is a dense herbaceous annual with a mounded form. Its medium texture blends into the garden, but can always be balanced by a couple of finer or coarser plants for an effective composition.

This is a relatively low maintenance plant, and may require the occasional pruning to look its best. It has no significant negative characteristics.

Purple Shamrock is recommended for the following landscape applications;

  • Mass Planting
  • General Garden Use
  • Groundcover
  • Container Planting

Planting & Growing

Purple Shamrock will grow to be only 6 inches tall at maturity extending to 8 inches tall with the flowers, with a spread of 6 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 5 inches apart. Its foliage tends to remain low and dense right to the ground. Although it's not a true annual, this plant can be expected to behave as an annual in our climate if left outdoors over the winter, usually needing replacement the following year. As such, gardeners should take into consideration that it will perform differently than it would in its native habitat.

This plant does best in full sun to partial shade. It is very adaptable to both dry and moist growing conditions, but will not tolerate any standing water. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. This is a selected variety of a species not originally from North America. It can be propagated by division; however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.

Purple Shamrock is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a canvas of foliage against which the thriller plants stand out. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Massing  Garden  Groundcover  Container 
Applications
Foliage Color 
Ornamental Features

Please note: Our Plant Guide is all about plants that will work in the high desert. It is not, nor is it intended to be, a current list of plants in stock on hand at each location or at our farm. We purposely do not sell or ship plants via the internet. Plant questions and availability are best determined in-store.