papilionacea, the purpleleaf false shamrock, is hardy in mild and coastal areas of Britain, down to −5 °C (23 °F), and has won the Royal Horticultural Society's Award of Garden Merit.

The leaf is formed of three sessile leaflets, obtriangular to obovate-triangular, glabrous, arranged in the same plane perpendicular to the petiole.

Oxalis triangularis requires bright indirect sunlight supplemented with a cool indoor temperature of 15 °C (59 °F).

Mature plants are cut back to the soil every 3–5 years in early summer or during the dormancy period.

Young plants are cut back to the soil every year in early summer or during the dormancy period, until they reach maturity.

Plants usually only need nitrogen but phosphorus, potassium, and easily absorbed trace elements help them to flower long and beautifully.

[5] When growing in a flowerbed,[6] it is also worth feeding oxalis during the flowering period with a small dose of a multi-component fertilizer.

[7] The subspecies Oxalis triangularis subsp papilionacea has won the Royal Horticultural Society's Award of Garden Merit.