In article , Steve
Harris writes
Brassica Leylandii, I believe ;-)

'Walking Stick' Cabbage are Brassica oleracea longata
aka Jersey Cabbage, Jersey Kale, Chou Cavalier; Tree cabbage; Walking-
Stick-Cabbage, Walking Stick Kale. Tall growing cabbage (to 6M.18ft.)
with large loose-leaved head. Stems used for walking sticks. Young
leaves and sprouts edible. Grow as for standard cabbage.

Details from urg Veg & Salad Index at:
http://www.fuchsiazone.co.uk/veg-index/vegindex.htm
--
Alan & Joan Gould - North Lincs.