In article , Steve
Harris writes

Mine has got to about 4-5 feet. It was started early and pampered. I
understand they should be left until next spring for harvesting. Maybe
it will be bigger then?

Ha, perhaps that is the over-wintering part then? I'll try leaving this
year's stems in but I can't really see them growing much more now.
--
Alan & Joan Gould - North Lincs.