How to Prune Peruvian lily 'Spitfire'?
Pull up spent flowered stems, leaving tubers in ground

Peruvian lily 'Spitfire' · Alstroemeria 'Spitfire'
Grow in fertile, moist but well-drained soils in full sun or partial shade. Young plants are best left undisturbed to form clumps; use a dry mulch for the first two winters. See Alstroemeria cultivation
Pull up spent flowered stems, leaving tubers in ground