Oxalis triangularis ‘Mijke’, commonly known as the Purple Shamrock or False Shamrock, is an elegant ornamental plant native to South America. A member of the Oxalidaceae family, this variety is admired for its rich, velvety purple foliage and delicate pale pink or white flowers.

The ‘Mijke’ cultivar is a refined selection known for its particularly deep, vibrant colouration and compact growth. The plant features distinctive triangular, clover-like leaves that fold closed at night or during low light — a fascinating movement known as nyctinasty. By day, the leaves open wide to reveal their satiny texture and jewel-like tones, creating a dynamic and ever-changing display.

In spring and summer, slender stems rise above the foliage, bearing clusters of soft pink blooms that contrast beautifully with the dark purple leaves. Compact and easy to grow, Oxalis triangularis ‘Mijke’ makes an ideal choice for windowsills, tabletops, and containers, bringing a touch of sophistication to any setting.

Oxalis triangularis ‘Mijke’ – Care Guide

Light

Thrives in bright, indirect light. It can tolerate gentle morning or late-afternoon sun, which enhances the rich purple leaf colour. Avoid harsh midday sunlight, which can fade or scorch the foliage.

Watering

Keep the soil lightly moist during the growing season. Water when the top 2–3 cm of soil feels dry. Reduce watering in winter when the plant becomes dormant and leaves naturally die back.

Temperature and Humidity

• Temperature: Prefers 18–26°C. Avoid temperatures below 10°C, especially during dormancy.

• Humidity: Adapts well to average indoor humidity levels.

Soil and Potting

Use a light, free-draining peat-free compost. Adding perlite or grit improves drainage. Repot every 2–3 years in spring, separating the small tubers (rhizomes) if you wish to propagate new plants.

Feeding

Feed every 4–6 weeks in spring and summer with a diluted balanced fertiliser. Stop feeding during the dormant winter period.

Pruning and Maintenance

Remove faded flowers and old leaves at the base to keep the plant tidy. If the plant enters dormancy and loses all its leaves, reduce watering completely and store in a cool, dry place until new shoots appear (usually after 6–8 weeks).

Growth and Maturity

A fast-growing, compact plant reaching 15–25 cm tall and wide. With proper care, it will regrow each year from its tubers.

Common Issues

• Yellowing leaves: Overwatering or poor drainage.

• Pale foliage: Too little light.

• Leaves closing in daylight: Sign of stress, such as overwatering or temperature changes.

• Pests: Occasionally aphids or spider mites.

Background and Benefits

Oxalis triangularis is native to Brazil and other parts of South America and has long been prized for its beauty and movement. The ‘Mijke’ variety is particularly valued for its darker, more uniform purple foliage. Compact, hardy, and endlessly elegant, it adds a graceful, decorative touch to indoor spaces and patios alike.

✅ Quick Care Summary

• Light: Bright, indirect; tolerates gentle sun

• Water: Lightly moist; reduce during dormancy

• Temperature: 18–26°C; avoid below 10°C

• Humidity: Average indoor

• Soil: Light, free-draining compost

• Feed: Every 4–6 weeks in spring/summer

• Growth: Compact perennial, 15–25 cm; deep purple triangular leaves and pale pink flowers