How to Prune Allium schubertii 'Magic'?
No pruning required, flowers and seedheads are very ornamental

Allium schubertii 'Magic' · Allium schubertii 'Magic'
Grow in full sun and fertile well-drained soil. It is best to grow in containers where garden soil is heavy clay and prone to saturation over winter. See allium cultivation
No pruning required, flowers and seedheads are very ornamental