Reiman Gardens switched to A.D.R. Bulbs 12 years ago and has never looked back. The bulbs are high quality and the customer service is exceptional. Chris and Philipp are always willing to answer my many questions! We take pride in supporting one of the last remaining bulb farms that grows and exports.

Sarah Rummery , Reiman Gardens

« 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.

Description	Price
Bin Display Box of 250 Bulbs, Size 1	$101.75
Get Notified When Back In Stock Complete this form and we'll notify you when SKU BIN1000047 is restocked. Email: Needed By: Qty Requested:
Bulk Tray of 2500 Bulbs, Size 1	$770.00
Get Notified When Back In Stock Complete this form and we'll notify you when SKU BUL11000155 is restocked. Email: Needed By: Qty Requested:

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.