How to Prune yellow garlic?
No pruning required, other than to remove old flowered stems and foliage

yellow garlic · Allium moly
Also known as: golden-flowered garlic; lily leek; moly; sorcerer's garlic; yellow onion
Grow in full sun and a 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, other than to remove old flowered stems and foliage