perennial

Purple Shamrock

Oxalis triangularis ssp papilionacea

The Story

Plant Bio

Oxalis triangularis 'Papilionacea' is a perennial herb characterized by its distinctive trifoliate, deep purple leaves that form a striking, symmetrical pattern and delicate, five-petaled white flowers. It prefers moist, well-drained soil and thrives in shaded to partially sunny locations.

This cultivar is notable for its unique butterfly-shaped leaf arrangement and its vibrant contrast between the dark foliage and the pristine white flowers, making it a standout ornamental plant.

Uses & Benefits:

The vibrant purple flowers and attractive trifoliate leaves add visual interest to shaded gardens and containers.

Provides ground cover in low-light areas, suppressing weeds and soil erosion.

Supports pollinators like bees and butterflies with early spring blooms.

Essentials

At a Glance

Plant Type

Perennial

Height

9 inches

Width

12 inches

Light

Partial Sun, Shade

Zones

8, 9, 10

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

Brazil

Toxicity

Toxic to pets in large quantities

Planting

How to Grow

Tuck seeds lightly into moist soil in early spring.
Keep soil consistently moist but not waterlogged.
Place in partial shade for best growth.
Mulch around plants to retain moisture.
Divide clumps every 2-3 years in early spring.
Mist cuttings to encourage root development.

Pro Tip

Ensure well-draining soil and avoid overwatering to prevent root rot.

Keep It Thriving

Care Guide

Do

Water regularly during active growth 🌱
Provide partial shade in hot climates
Feed with a balanced fertilizer in spring
Divide in early spring to maintain vigor

Don't

Avoid overwatering to prevent rot ❌
Don’t expose to full harsh sun in extreme heat
Refrain from heavy fertilization late in season

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Shaded border with purple accentsGroundcover beneath treesContainer plant for shaded patios

Companion Plants

HostaFerns Astilbe HeucheraJapanese forest grass

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?

Not reliably. Deer may browse Purple Shamrock, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Purple Shamrock bloom?

Purple Shamrock typically blooms in spring to summer through late 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.