bulb corm tuber

Purple Shamrock

Oxalis regnellii

The Story

Plant Bio

Oxalis regnellii 'Triangularis' is known for its decorative triangular leaflets and retains foliage throughout the year in warmer climates.

This cultivar features striking purple leaves which are a distinctive characteristic, making it unique among other Oxalis species.

Uses & Benefits:

Adds vibrant purple foliage to shaded gardens, providing visual interest year-round.

Requires minimal maintenance and tolerates partial shade, making it ideal for low-effort gardens.

Provides nectar for pollinators and creates ground cover that suppresses weeds.

Essentials

At a Glance

Plant Type

Bulb Corm Tuber

Height

9 inches

Width

18 inches

Light

Partial Sun, Shade

Zones

8, 9, 10

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

South America

Toxicity

Toxic to pets and humans if ingested

Bloom period

Early spring – Mid-spring

In flower about 2 months of the year

Planting

How to Grow

Tuck bulbs into well-draining soil in early spring.
Mist cuttings lightly to maintain humidity, keep soil moist.
Place in partial shade for optimal growth.
Water regularly but avoid waterlogging, especially in winter.
Fertilize monthly with balanced liquid feed during active growth.
Divide clumps every 2-3 years to maintain vigor.

Pro Tip

Ensure soil is well-draining to prevent bulb rot and promote healthy growth.

Keep It Thriving

Care Guide

Do

Water moderately during growing season 🌱
Provide bright indirect light for best foliage
Fertilize monthly during active growth
Divide clumps in spring every few years
Protect from frost in colder zones

Don't

Avoid overwatering to prevent bulb rot ❌
Do not place in full sun in hot climates
Refrain from neglecting winter dormancy
Never transplant during flowering
Avoid using heavy clay soil without amendments

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Fertilize
Plant
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Violet-colored groundcover in shaded bedsContainer accent for patiosEdging plant along walkways

Companion Plants

HostaFerns Caladium Begonia Impatiens

Multiply

Propagation Methods

Good to Know

Common Questions

Purple Shamrock questions

What zones can Purple Shamrock grow in?

Purple Shamrock is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Purple Shamrock deer resistant?

Yes — Purple Shamrock is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Purple Shamrock bloom?

Purple Shamrock typically blooms in early spring through mid-spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Purple Shamrock need full sun?

Purple Shamrock does best in part shade.