False Shamrock
Oxalis regnellii
False Shamrock grows clover-like trifoliate leaves that fold closed at night and open by day. Clusters of small star-shaped white flowers sit above the green foliage. It is an easy tabletop plant once you accept its natural dormancy cycles.
Light
Bright Indirect
Water
Moderate
Difficulty
Easy
Humidity
Moderate
Pet Warning
Contains oxalic acid, which is toxic to dogs, cats, and horses. If ingested, it can cause excessive salivation, vomiting, and in large quantities, kidney distress.
Care Notes
Light
Place your plant in bright, indirect light. An east or west window works well. Too little light stretches the stems and thins the clump.
Water
Water when the top inch of soil feels dry. Keep moisture steady, but use a planter with drainage holes so the bulbs do not sit wet.
Soil
A peat-based mix with perlite or sand drains well and still holds enough organic matter for active growth.
Humidity & Temperature
Moderate humidity is fine. Aim for 60°F to 75°F (15°C-24°C); heat above 80°F can wilt the plant or push it into early dormancy. When leaves yellow and die back despite good care, stop watering, move the pot somewhere cool and dark for 4-6 weeks, then return it to light when new shoots appear.
Common Issues
Yellow leaves can mean overwatering or the start of dormancy. Leggy growth means it needs a brighter spot.
In-Depth Care & Growth
Feeding & Soil
Fertilizer
Balanced water-soluble houseplant fertilizer (10-10-10)
Soil
A well-draining potting mix high in organic matter, such as a peat-based mix with added perlite or sand.
Physical Attributes
Mature Size
6-12 inches tall and wide
Growth Rate
Fast
Propagation
Division of the small bulb-like rhizomes, best performed during the dormant period or when repotting in early spring.
Common Varieties
Oxalis triangularis (Purple Shamrock)
Deep burgundy triangular leaflets, often with lighter pinkish-violet patterning in the centers.
Oxalis regnellii 'Lucky'
Green triangular leaflets with a silvery-green watermark pattern in the centers.
Oxalis tetraphylla (Iron Cross)
Four heart-shaped bright green leaflets with a dark purple-to-black center that forms a cross pattern.