How to Propagate flat-stalked garlic?
Propagate by seed when just ripe or in spring; or propagate by offsets which can be carefully detached by lifting the bulb after flowering has finished. See bulb propagation

flat-stalked garlic · Allium nutans
Grow in moist but well-drained, reasonably fertile soil in full sun. Happy in moist soils, unlike most allium species. See allium cultivation for further advice
Propagate by seed when just ripe or in spring; or propagate by offsets which can be carefully detached by lifting the bulb after flowering has finished. See bulb propagation