Purple Shamrock - Oxalis triangularis ‘Mijke’

Overview: Oxalis triangularis ‘Mijke’ is a showstopper of a houseplant, loved for its deep purple, triangular leaves that open and close with the rhythm of the day—like delicate butterflies fluttering with the light. The ‘Mijke’ cultivar boasts particularly vivid foliage and soft, lilac-pink blooms that hover gracefully above the foliage. Its compact size, quirky movement, and bold colouring make it a charming addition to any well-lit room or windowsill display.

Growing Conditions in Native Habitat: Found growing in warm, shaded woodlands and grassy areas in South America, where it experiences seasonal rainfall and periods of dormancy.

Care Guide Light: Thrives in bright, indirect light. A few hours of soft morning sun will enhance its vibrant leaf colour, but avoid harsh midday rays which can fade or scorch the foliage. Ideal Room: Perfect for sunny spots in kitchens, living rooms, or bright offices. Feeding: Feed once a month during the active growing season (spring to early autumn) with a balanced liquid houseplant fertilizer. Humidity: Average household humidity is fine, though it appreciates a little extra during very dry months. Ideal Temperature: Prefers temperatures between 60°F and 75°F (15°C to 24°C). Protect from cold drafts and avoid exposure to temperatures below 50°F (10°C). Watering: Water when the top inch of soil feels dry. Allow water to drain freely and avoid letting the plant sit in excess moisture. Reduce watering during winter or if the plant enters dormancy.

Pet/Child Safe: Mildly toxic if ingested. Contains oxalates that can cause irritation—keep out of reach of pets and children.

Soil Type: Use a well-draining potting mix. A blend of standard indoor compost with added sand or perlite works well to prevent waterlogging.

Propagation: Easily propagated by dividing the underground rhizomes when repotting. Replant divisions into fresh soil and keep lightly moist until established.

Eventual Height and Spread: Reaches around 6–12 inches (15–30 cm) tall and wide, creating a soft, mounded shape perfect for shelves or tabletop displays.

Growth Rate: Moderate. May go dormant in colder months, losing leaves before regrowing vigorously in spring.

Pests and Treatment: Generally pest-resistant, but may occasionally attract fungus gnats or aphids. Treat with neem oil or insecticidal soap if needed.

Repotting: Repot every couple of years in early spring before new growth begins, or when the plant has outgrown its pot.

Pruning: Remove faded flowers and old leaves at the base to encourage fresh, healthy foliage. If the plant becomes leggy, cut it back gently to refresh growth.

Air Purification: While not a top performer in NASA studies, its presence adds visual serenity and contributes to a calming indoor atmosphere.