False Shamrock Identification Guide

Key Identifying Features

The False Shamrock (Oxalis triangularis, also Purple Shamrock or Love Plant) is a bulbous wood-sorrel recognized by its deep purple, triangular leaflets arranged in threes that fold up like butterflies at night. The dramatic burgundy color and nyctinastic movement make it unmistakable.

• Three triangular (butterfly-wing) leaflets per leaf
• Deep purple to maroon foliage (sometimes green forms)
• Leaves and flowers fold/close at night and reopen by day
• Delicate pale pink/white flowers

Leaves & Stems

Each leaf is trifoliate, with three broad, triangular leaflets (wider at the tip than the base) that hinge at the center. The classic cultivar is a rich purple-violet, often with a darker zone toward the center. Leaves are held on slender, fragile petioles rising from underground bulbs/rhizomes. The whole leaf performs daily movements (nyctinasty), opening flat in light and folding down in darkness, an easy live confirmation of Oxalis.

Flowers & Fruit

Flowers are small, five-petaled, and pale lavender, pink, or white, held in loose clusters above the foliage. They also close at night. Fruit is a small capsule, rarely noticed indoors. The plant grows from bulbs and can go dormant, regrowing after a rest.

How to Tell It Apart from Look-Alikes

• True shamrock/clover (Trifolium) has rounded green leaflets, not triangular purple ones, and does not grow from bulbs.
• Oxalis tetraphylla (Iron Cross) has four leaflets with a dark central marking.
• Green Oxalis (O. regnellii) is the same species form but green; the leaf shape and night folding are identical.

The three triangular purple leaflets that fold at night are diagnostic for False Shamrock.

Where You'll Find It

Native to Brazil, it is grown as a houseplant and seasonal garden plant worldwide. Indoors it wants bright indirect to direct light to keep deep purple color. It grows from bulbs, may go dormant in summer or winter, and returns with watering.

Quick ID Checklist

• Trifoliate leaves with three triangular leaflets
• Deep purple/maroon color (or green form)
• Leaves fold up at night, open by day
• Small pale pink/white flowers
• Grows from underground bulbs

Triangular purple leaflets that close like butterflies at night confirm Oxalis triangularis.