How to Prune plain harlequin flower?
Remove spent flower stems and allow foliage to die down naturally

plain harlequin flower · Sparaxis grandiflora
Grow under glass in good light but shaded from hot sun. In autumn, plant corms 20cm deep in loam-based potting compost with added sand and leaf mould. Water sparingly when in growth and keep cool; dry off as flowers fade and keep completely dry when dormant
Remove spent flower stems and allow foliage to die down naturally