Easy Flowering Toxic to pets

Purple Shamrock

Oxalis triangularis

Purple Shamrock is a fascinating bulbous plant with intense purple triangular foliage that opens and closes with the rhythm of day and night.

The essentials at a glance

Watering

Every 5 days
Light

Bright indirect light
Humidity

40–60 %
Temperature

15–25 °C

How to care for your Purple Shamrock

Everything you need to keep your Purple Shamrock healthy: watering, light, humidity, feeding, repotting and pruning.

Oxalis triangularis originates from Brazil and stands out with its spectacular butterfly-shaped foliage in deep purple. Its trifoliate leaves display a fascinating movement: they open in the morning to capture light and close in the evening like umbrellas. Delicate pale pink flowers regularly appear above the foliage. The plant may go dormant for a few weeks, losing all its foliage before vigorously regrowing from its underground bulbs.

Watering your Purple Shamrock

Every 5 days

Water moderately, allowing the compost to dry slightly between waterings. Reduce significantly during the dormancy period.

How to know it needs water

Compost dry 2–3 cm down
Leaves closing during the day (sign of stress)
Pot feels light

How much light a Purple Shamrock needs

Bright indirect light

Bright indirect light. Tolerates semi-shade. Foliage will be more deeply coloured with better light.

Direct sun tolerated: 1 to 3 h a day
Orientations that suit it: North, North-east, East, South-east, South, South-west, West, North-west

Humidity and misting

40–60 %

40–60% No misting necessary. Oxalis adapts well to the normal ambient humidity of an indoor space.

Feeding and fertiliser

Every 30 days

Fertilize only during the active growing period. Stop completely during dormancy. Oxalis has low nutrient requirements.

Recommended feed: Dilute balanced liquid fertilizer (NPK 10-10-10), once a month. · 5-10-5

Repotting your Purple Shamrock

Every 24 months

Use light, well-draining compost. Plant the small bulbs (rhizomes) 2–3 cm deep. This is the ideal time to divide bulbs to multiply the plant.

When: Spring, as it emerges from dormancy
Potting mix: All-purpose potting mix
Mix in: perlite, coco fibre

The tell-tale signs

Bulbs very crowded in the pot
Plant producing fewer leaves
Substrate exhausted and compacted

Pruning your Purple Shamrock

When the plant enters dormancy and the foliage yellows. Cut all yellowed or dry foliage to the ground. The plant will regrow on its own from the bulbs after a few weeks of rest. Do not worry — this is entirely natural.

Through the year

Watering is not set once and for all: it follows the light and the growth. Allow 9 days between waterings in the depth of winter, against 4 in the growing season.

Active growth · Days between waterings

Toxicity

Contains calcium oxalates toxic to dogs and cats. Ingestion in large quantities can cause tremors, hypersalivation, and renal failure.

Good to know

Oxalis leaves fold down in the evening and on cloudy days through a mechanism called nyctinasty, as if the plant is falling asleep.
Despite its shamrock nickname, Oxalis has no relation to true clover (Trifolium) and belongs to a completely different family.

Frequently asked questions about the Purple Shamrock

How do you care for a Purple Shamrock?

Water it every 5 days. Give it bright indirect light. Ideal humidity: 40–60 %. Ideal temperature: 15–25 °C. Water moderately, allowing the compost to dry slightly between waterings. Reduce significantly during the dormancy period.

How often should you water a Purple Shamrock?

Every 5 days Water moderately, allowing the compost to dry slightly between waterings. Reduce significantly during the dormancy period. How to know it needs water : Compost dry 2–3 cm down ; Leaves closing during the day (sign of stress) ; Pot feels light.

How much light does a Purple Shamrock need?

Bright indirect light Bright indirect light. Tolerates semi-shade. Foliage will be more deeply coloured with better light. 1 to 3 h a day

Is the Purple Shamrock toxic to cats and dogs?

Yes. Contains calcium oxalates toxic to dogs and cats. Ingestion in large quantities can cause tremors, hypersalivation, and renal failure. Keep it out of reach of your pets and call a vet if any is swallowed.

Why are my Purple Shamrock leaves turning yellow?

Yellowing most often comes from too much water: the mix stays wet and the roots suffocate. Check that the pot drains, empty the saucer, and let the mix dry before watering again. Too little light or a cold draught cause the same symptom.

When should you repot a Purple Shamrock?

Repot every 24 months, ideally in spring, as it emerges from dormancy. Use light, well-draining compost. Plant the small bulbs (rhizomes) 2–3 cm deep. This is the ideal time to divide bulbs to multiply the plant.