Oxalis triangularis is the common purple false shamrock houseplant. Labels may say purple shamrock, love plant, or purple wood sorrel. Formerly Oxalis regnellii. Same URL. Family Oxalidaceae. Not true Irish clover (Trifolium).
NCSU Recommended Propagation Strategy for O. triangularis: division and seed. It grows from rhizomes with scale leaves like an elongated bulb. Penn State: grows from tubers; three triangular leaflets; five-petaled white flowers. University of Missouri IPM treats houseplant shamrocks as Oxalis imposters versus Trifolium. UAEX Shamrock row: division best; leaf yes; seed no; terminal no.
Houseplant "shamrocks" on NCSU's genus false-shamrock page also include other Oxalis species. MU notes O. deppei has four leaflets ("lucky clover"), different from classic three-leaflet O. triangularis.
For mix, see soil propagation.
Division of rhizomes and tubers
NCSU O. triangularis: propagated by dividing the rhizome or by breaking off the scale leaves, which will produce new plants.
Penn State: after dormancy signals, you can divide them by separating some tubers and replanting them in new pots.
University of Missouri: after a 4–8 week dry rest for dormancy types, the bulb-like structures may be divided and repotted before forcing new growth; resume watering. Do not force rest on species that keep flowering.
UAEX: Shamrock division is best.
NCSU genus page: bury rhizomes or stolons about 2 inches. Bulb storage in peat or vermiculite at 35–41°F (2–5°C).
Scale leaves
NCSU O. triangularis explicitly: breaking off the scale leaves produces new plants. Do not invent leaf-petiole cuttings as the same thing. UAEX Shamrock leaf yes is table-level and does not name O. triangularis alone.
Seed
NCSU lists seed in Recommended Propagation Strategy for O. triangularis and the genus. UAEX Shamrock row: seed no. Report both; do not invent a single rule.
Dormancy next to division
Penn State: late fall foliage yellows and dies; stop water and fertilizer; cool dark storage one to several months; wait for new growth.
MU: dry down 4–8 weeks if the plant is a dormancy type; then divide and repot before forcing.
NCSU: may go dormant in autumn or if too hot or dry; cut watering; wait for new growth. Genus page: dark cool area, new growth in 1–3 months.
Common mistakes
- Inventing stem-tip cuttings. UAEX terminal no for Shamrock.
- Inventing water propagation.
- Forcing a dormancy recipe onto non-dormant oxalis (MU warning).
- Copying Trifolium care onto Oxalis. Penn State and MU say commercial indoor shamrocks are usually Oxalis.
- Averaging NCSU's seed yes with UAEX's seed no into one invented answer.
- Inventing MSU storage numbers from a blocked page.
People also ask
How do I divide false shamrock?
NCSU: divide the rhizome or break off scale leaves. Penn State: separate tubers and replant. UAEX ranks division best. MU ties division to after a dry rest for dormancy types.
Is indoor shamrock the same as Irish clover?
Usually no. Penn State and MU: commercial shamrock houseplants are typically Oxalis, not Trifolium, which is poorly adapted indoors long-term.
Can I grow oxalis from seed?
NCSU includes seed for O. triangularis. UAEX Shamrock table says seed no. Quote both rather than picking one.