What is your normal winter temperature range Jim? and your known minimum winter temperatures? I grow most of the Arum you list without cover. Normal minimums here are about minus 12 C. lst winter was much colder. Every few winters here there is a period of up to six weeks wihout thaw but most winters the pattern is freeze/ thaw, with the occasional frozen week. Peter (UK) On Thu, Feb 16, 2012 at 10:58 PM, Jim McKenney <jamesamckenney@verizon.net>wrote: > > But my experiences here make me very reluctant to recommend any of the > winter green aroids (Ambrosina, Arisarum except proboscideum, Biarum, and > Arum in general except Arum italicum) as plants for the open garden. >