We have been purchasing our bulbs from A.D.R. for many years now. As a contractor, the process to order bulbs for many different clients is easy and seamless. The website is a wonderful tool that we refer to quite often for product information, photos, and combination ideas. Our bulbs always arrive on time and wonderfully organized to make our installation much more efficient . The product is top notch and leaves our customers with wanting more and more each season.

Ashley Marrin , Bret-Mar Landscape

« Previous Plant | Next Plant »

Oxalis 'Triangularis'

Purple Shamrock

Oxalis triangularis, commonly known as Purple Shamrock, is a bulbous perennial prized for its deep purple, triangular leaves that fold at night and reopen in daylight. This movement, known as photonasty, adds a dynamic element to its charm.

In spring and summer, Oxalis triangularis produces delicate, trumpet-shaped flowers in white or pale pink, contrasting beautifully with its dark foliage. It thrives in bright, indirect light and prefers well-drained soil, making it ideal for indoor cultivation or shaded garden beds. This variety is low-maintenance and can be grown in containers or as a seasonal accent plant.

Oxalis Calculator

Fill out the dimensions below to determine how much product is required for planting.

When should I plant Oxalis 'Triangularis'?

Growing and Maintenance Tips for Oxalis 'Triangularis'

Planting: Plant bulbs just below the surface in a well-draining potting mix (2 parts peat to 1 part loam works well). Use a container with drainage holes.
Spacing: Place bulbs 1 to 2 inches apart for a full look.
Light: Prefers bright, indirect light. A north- or east-facing window is ideal. Can tolerate some direct morning sun but avoid harsh afternoon rays.
Watering: Water when the top inch of soil feels dry. Avoid overwatering—Oxalis dislikes soggy roots. Reduce watering during dormancy (often in summer or winter).
Temperature & Humidity: Thrives at 60–75°F. Protect from drafts and temperature swings. Prefers moderate humidity but adapts well to typical indoor conditions.
Fertilization: Feed every 2–3 weeks during active growth (spring and fall) with a balanced liquid fertilizer diluted to half strength.
Dormancy: If leaves yellow and die back, the plant may be entering dormancy. Stop watering, let it rest in a cool, dry spot for 4–6 weeks, then resume watering to encourage regrowth.
Propagation: Divide bulbs or offsets when repotting. Each section should have 3+ growing points for best success.
Pest & Disease: Generally pest-free. Watch for root rot if overwatered. Toxic if ingested—keep away from pets and children.