The reason for the name(Also known as tree onions) is that they form a head
of bulbuls in a stalk which as it dies falls over so the next clump to grow
is anything from 1 to 2.5 ft away from the first so that if left over a few
years they can move several yards.
In America they cut the stems and leaves into sections and have them
stuffed.
--
David Hill
Abacus Nurseries
www.abacus-nurseries.co.uk