How to Prune purpleleaf false shamrock?
No pruning required

purpleleaf false shamrock · Oxalis triangularis subsp. papilionacea
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
No pruning required