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Oxalis triangularis folds up for the evening

Its leaves, each made of three triangular leaflets, change position at night: a small performance that requires no remote control.

1 min readPublished
Potted Oxalis triangularis with purple leaves composed of three leaflets, one folded leaf and small pink flowers; a crescent moon suggests evening.
Positive Times · ImageGen · AI-assisted illustration

Easy

How to care for it, step by step

Care guide checked on

Is it for you?

Suitable for an indoor pot or a sheltered outdoor position where climate allows. A container makes protection during cold periods easier. [2]

Where to put it

Choose a bright window; it can take sun or partial shade. Leaf loss during very hot weather is not automatically a request for more sun. [1]

When and how to water

Feel the surface: when dry, water and let excess escape. If it becomes dormant and loses foliage, reduce water; resume gradually when new shoots appear. [1]

Pot and growing medium

Use a light, freely draining mix with organic matter or a sandy component in a pot with holes. Water should pass through rather than collect around roots. [2]

Step by step

  1. Choose a sheltered spot and a pot you can move if frost is forecast. [2]

  2. Before watering, check the mix rather than leaf position alone. [1]

  3. Routine pruning is unnecessary; outdoors, watch for chewed leaves. [2]

If something looks wrong

Leaves close in the evening

Check

Do they reopen with light? Night-time closure is normal. [1]

What to do

Do not add extra water to make them reopen. [1]

Leaves have missing pieces

Check

Outdoors, look for slugs and snails before blaming watering. [2]

What to do

Remove any animals found and protect the pot; chewing marks alone cannot identify the culprit with certainty. [2]

Read the sources (2)
  1. Oxalis triangularis NC State Extension · accessed 7 Oct 2026
  2. Oxalis triangularis Royal Horticultural Society · accessed 7 Oct 2026

Oxalis triangularis has leaves made of three leaflets, which can be green or deep purple. North Carolina State University describes their nightly closure; the small white or pink flowers also close at night. [1]

The Royal Horticultural Society describes its clump-forming habit and triangular leaflets. Flowers appear on slender stems above the foliage: a useful detail for recognising the plant beyond the outline of something that resembles clover. [2]

Take this with youA suggestion from our editors: observe the same leaf before and after sunset, without touching it. A change of position can deserve more attention than a notification.

Read the sources (2)
  1. Oxalis triangularis North Carolina State University · Extension Gardener Plant Toolbox · accessed 13 Sept 2026
  2. Oxalis triangularis Royal Horticultural Society · accessed 13 Sept 2026

Original writing and illustration made with AI assistance. Our editorial method

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