allium cernuum

Nodding onion (Allium cernuum) is widespread.

A friend has suggested Allium cernuum, which he has seen colonising sunny borders in Oxfordshire.

Orders to Telegraph Garden Service, Allium cernuum, Dept.

Produces abundant white flowers that dry to produce white cottonball-like puffs which stay on the plant all winter long.Nodding Onion (Allium cernuum )

I'm also fond of the nodding onion (Allium cernuum), all of which is edible: the small bulbs and leaves taste of sweet spring onions, while the flowers carry a bolder flavour.