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

few-flowered garlic · Allium paradoxum
Also known as: few-flowered leek; quaint garlic
This plant is listed on Schedule 9 of the UK Wildlife & Countryside Act as an invasive non-native species. Although not banned from sale, it is an offence to plant or cause these to grow in the wild IN ENGLAND WALES, NORTHERN IRELAND and the REPUBLIC OF IRELAND. Gardeners possessing them should undertake measures to control them. See RHS advice on invasive non-native species for further information
No pruning required, other than to remove old flowered stems and foliage