False Shamrock
Oxalis regnellii
The Oxalis regnellii, commonly known as the Green Shamrock or False Shamrock, is a delightful and expressive houseplant characterized by its vibrant green, trifoliate leaves that resemble a three-leaf clover. This plant is famous for its nyctinastic movements, where the leaves fold inward at night and open wide during the day to catch the sunlight. It produces clusters of delicate, star-shaped white flowers that contrast beautifully against its lush greenery.
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 Guide
Light
Place your Oxalis in a spot with bright, indirect sunlight. A window facing East or West is ideal. Too little light can cause the plant to become leggy and lose its compact, bushy appearance.
Watering
Water when the top inch of soil feels dry to the touch. Oxalis prefers consistent moisture but is prone to bulb rot if the soil remains waterlogged. Ensure your pot has excellent drainage.
Managing Dormancy
Oxalis plants naturally enter a dormant phase once or twice a year. If the leaves start to turn yellow and die back despite proper care, do not panic. Stop watering and move the plant to a cool, dark place for 4-6 weeks. Once new shoots appear, bring it back to the light and resume regular watering.
Temperature
This plant thrives in cooler indoor temperatures between 60°F and 75°F (15°C - 24°C). Temperatures above 80°F may cause the plant to wilt or enter dormancy prematurely.
Common Issues
- Yellowing Leaves: Usually indicates overwatering or the beginning of a dormancy cycle.
- Legginess: A sign that the plant is reaching for more light; move it to a brighter location.
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.