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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names purpleleaf false shamrock
Synonyms Oxalis regnellii 'Brazilian Butterfly' Oxalis regnellii
Family Oxalidaceae
Genus Oxalis can be annuals or perennials, with fibrous, bulbous or rhizomatous rootstocks, palmately divided leaves and funnel-shaped or bowl-shaped flowers that mostly close in dull weather and at night
Details O. triangularis subsp. papilionacea is a deciduous, winter-dormant, frost-tender bulbous plant, producing purple foliage from spring to autumn and white to pale-pink starry flowers in summer
Foliage Deciduous
Habit Suckering
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H3
Partial Shade
Aspect South-facing or East-facing or West-facing
Exposure Sheltered
Loam
Sand
MoistureMoist but well-drained
SoilLoam, Sand
pHAlkaline, Neutral
Ultimate height 0.1-0.5 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 1-2 years
Cultivation Can be grown year-round in a cool greenhouse or conservatory or a cool room indoors. Alternatively place outdoors in late spring to early autumn in partial shade. Bring indoors for the winter and provide cool, frost-free conditions. Requires a moisture retentive but well-drained soil mix of equal parts loam, leaf mould (or soil-less compost) and grit. Water moderately when in growth and apply a balanced liquid fertiliser monthly. Keep barely moist when dormant in the winter
Propagation Propagate by seed or division
Suggested planting locations and garden types Sub-tropical Patio & Container Plants
Pruning No pruning necessary
Pests Slugs and snails may be a problem outdoors
Diseases Prone to rust diseases
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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.