Purple Shamrock

Oxalis triangularis

FloweringEasyFasttoxic to pets

Good to know: A living clock: the butterfly-shaped leaves fold up like tiny umbrellas at dusk and reopen at dawn, and the dainty pale-pink flowers do the same. Often sold as a St. Patrick's Day "lucky shamrock," though it's an Oxalis, not a true clover.

Through the year 🗓️

🍂 Fall now

Ease off water and feed as growth slows, and move it somewhere bright for the darker months.

❄️ Winter

If it dies back, rest the bulbs nearly dry for a few weeks, then restart watering when new shoots appear.

🌱 Spring

Divide crowded bulbs into fresh mix and resume feeding as new leaves unfurl.

☀️ Summer

Give it bright light and keep it cool if you can. It may take a summer nap in real heat, which is normal.

The details

Light & placement

Light: Bright indirect with a few hours of direct sun; the deep purple needs strong light or the leaves pale and flatten out
Ideal PPFD: 200–400 µmol·m⁻²·s⁻¹
Grow-light distance: 10–16 in below LED

Water & feed

Watering method: Water when the top inch dries, then drain. It grows from small bulbs that rot in constantly wet soil. If the whole clump flops and browns, don't toss it: that's dormancy, not death.
Fertilizer: Balanced feed at ½ strength, monthly while it's actively growing.

Home & habit

Soil: Light, well-draining mix with perlite; pH 6.0–7.0
Humidity: Average (40–50%); no fuss
Temperature: 60–75 °F; it likes things cooler than most
Mature size: 8–12 in mound
Repotting: Every 1–2 yrs; divide the bulbs when the pot fills
Propagation: Lift and divide the little bulbs at repotting; each one starts a new plant.

When something looks wrong

Overwatering signs: Mushy stems, yellowing leaves, soft rotting bulbs below the soil
Underwatering signs: Leaves fold shut and stay collapsed; crispy edges on the thin foliage
Common pests: Aphids, spider mites, whitefly, fungus gnats

Care notes: The disappearing act fools everyone: every few months it may brown off and look stone dead. That's a natural rest, so stop watering, cut the dead growth away, and in a few weeks fresh purple triangles push back up. Bright light is what keeps the color deep rather than washed-out.

Common problems 🩺

The usual suspects when Purple Shamrock looks unhappy. Most houseplant trouble is watering or light, not disease — see all plant problems if you are not sure which plant is the culprit.

The whole plant dying back

Likely cause
Dormancy, not death. Oxalis rests for weeks at a time, often after flowering.

What to do
Cut the dead growth away, keep the bulbs dry and cool for a few weeks, then resume watering. It resprouts.

Long, floppy, reaching stems

Likely cause
Too little light.

What to do
Move it to bright indirect light with a few hours of gentle sun; rotate it so it grows evenly.

Mushy base and collapsing stems

Likely cause
Overwatering the bulbs.

What to do
Let the top inch dry between waterings, and water much less while it is dormant.

More like this 🌿

Peace Lily

African Violet

Air Plant

Anthurium

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