Oxalis Triangularis 'Mijke' (green shamrock) care

Light

Bright but filtered. Oxalis Triangularis 'Mijke' burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Thrives in bright indirect light with a little direct morning sun, which keeps the green foliage compact and encourages flowering. Too little light makes it stretch and flop; harsh midday sun can scorch the thin leaves. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering oxalis triangularis 'mijke': when the top 2-3 cm of soil is dry, roughly every 7-10 days. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water when the top couple of centimetres dry out and let excess drain away; the bulbs rot in soggy soil. If leaves yellow and die back, it may be entering natural dormancy rather than failing, so ease off watering.

Soil and pot

Oxalis Triangularis 'Mijke' grows best in light, well-draining potting mix. A general houseplant compost lightened with perlite drains well and suits the small bulbs. Good drainage is essential to prevent bulb and root rot. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Oxalis Triangularis 'Mijke' sits happiest at around 40-60% humidity and 15-24°C (59-75°F). Average household humidity is fine; it is not demanding. Avoid both bone-dry air near heaters and persistently damp, stagnant conditions that encourage rot and mildew. If you keep the room above 15 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed oxalis triangularis 'mijke' sparingly. Feed monthly with a balanced, diluted liquid fertiliser during active growth in spring and summer. Stop feeding entirely when the plant enters dormancy and the foliage dies back, resuming only when new growth appears. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on oxalis triangularis 'mijke' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Dormancy mistaken for death — Periodic foliage die-back is normal. Cut back spent leaves, reduce watering, and keep the pot cool and dry until fresh shoots emerge from the bulbs.
• Bulb rot from overwatering — Soggy soil rots the small bulbs. Let the top of the soil dry between waterings and ensure the pot drains freely.
• Leggy, floppy growth — A sign of insufficient light. Move to a brighter spot so the leaf stalks stay short and the clump dense.
• Spider mites — Dry indoor air can bring mites to the thin foliage, causing stippling. Rinse the leaves and treat with insecticidal soap if needed.

Propagation

Easiest by division: lift the clump when repotting and separate the small bulbs (rhizomatous tubers), replanting a few per pot. Each bulb sprouts into a new plant given warmth, light and moisture. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Oxalis Triangularis 'Mijke' is toxic to pets. Oxalis is listed by the ASPCA as toxic to cats and dogs; the toxic principle is soluble calcium oxalates. Chewing can cause drooling, oral irritation, vomiting and diarrhoea, and large ingestions can affect calcium balance and kidney function, though serious cases are uncommon. Keep out of reach of pets and contact a vet if ingested. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Oxalis Triangularis 'Mijke' deep-dive guides

Every aspect of oxalis triangularis 'mijke' care, each with its own calibrated guide:

• Oxalis Triangularis 'Mijke' watering schedule
• Oxalis Triangularis 'Mijke' light requirements
• Best soil mix for oxalis triangularis 'mijke'
• Oxalis Triangularis 'Mijke' fertilizing guide
• When to repot oxalis triangularis 'mijke'
• How to propagate oxalis triangularis 'mijke'
• Oxalis Triangularis 'Mijke' growth rate & size
• Oxalis Triangularis 'Mijke' cold hardiness
• Oxalis Triangularis 'Mijke' temperature & humidity
• Is oxalis triangularis 'mijke' toxic to cats & dogs?
• Is oxalis triangularis 'mijke' toxic to cats?
• Is oxalis triangularis 'mijke' toxic to dogs?

Featured in these plant shortlists

Oxalis Triangularis 'Mijke' qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Oxalis Triangularis 'Mijke' is also commonly called green shamrock or Mijke oxalis.

• Snake plant care — light, water and common problems
• Dracaena care — light, water and common problems
• Peperomia care — light, water and common problems
• All 3899 plant care guides in the Growli library