Oxalis

Oxalis, commonly known as Wood Sorrel or the Shamrock Plant, is a diverse genus of plants with over 800 species found worldwide. Many popular houseplant varieties, such as Oxalis triangularis and Oxalis deppei, originate from South America, Africa, and parts of Europe. These plants are admired for their colourful foliage, delicate flowers and easy care nature.

This mini guide will explain everything you need to know about caring for Oxalis, including lighting, watering, dormancy, and troubleshooting common issues. 

💡 Did You Know? Oxalis plants exhibit an interesting behaviour called nyctinasty, where their leaves fold down at night and reopen during the day. This natural rhythm is triggered by light sensitivity and helps conserve water and protect from pests.

What Lighting Do Oxalis Prefer?

Oxalis thrives in bright, indirect light. A south or east-facing window is ideal, as too much direct sunlight can scorch the leaves, while too little light may result in leggy and less vibrant growth. 

How Often Should I Water My Oxalis?

Oxalis prefers consistently moist but not soggy soil. Water when the top inch of soil feels dry, typically once a week, using room-temperature water to avoid shocking their fine and fragile roots. Reduce watering frequency in the plant’s dormant period (usually late summer or winter) when it dies back temporarily.

Unlike many houseplants, Oxalis goes through a natural dormancy period where it may appear to die back. This usually happens in late summer or winter, depending on the species. Dormancy is a resting phase, not a sign of plant death. During this time:

• Leaves will yellow and fall off
• Growth will slow or stop completely
• The plant will rely on its underground bulbs to store energy.

How to Care for a Dormant Oxalis:

• Reduce watering:
• Stop fertilising
• Store the pot in a cool, dry place for about 4-6 weeks.
• Resume care when new growth appears

When Should I Repot My Oxalis?

Repot your Oxalis every 1–2 years or when the plant outgrows its container. Spring is the best time for repotting, as the plant enters its active growing phase. Be gentle when handling the delicate bulbs or rhizomes to avoid damage.

Using a well-draining potting mix is essential to prevent root rot. Consider using our Simply Houseplant Mix for an optimal growing medium. 

Do I Need to Feed My Oxalis?

Yes! During the growing season (spring to early autumn), feed your Oxalis with a diluted balanced liquid fertiliser every 2–4 weeks. A general-purpose houseplant fertiliser works well. Reduce feeding in the dormant period when growth slows down.

Common Issues When Growing Oxalis Houseplants

• Yellowing leaves overwatering or poor drainage. Allow soil to dry slightly between waterings.

• Drooping leaves could be a sign of underwatering, dormancy, or too much direct sun.

• Leggy growth can be due to insufficient light. Move your plant to a brighter location.

• Dormancy confusion… Many owners mistake dormancy for plant death. Be patient and let the plant rest.

• Pests might be attracted to the flowers on this plant. Keep an eye out for spider mites and aphids. Treat with insecticidal soap if needed.

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