Here in Canby, OR, USA, in a similar zone as yours, we successfully grow Dracunculus vulgaris and Arum italicum (in addition to the ones you mentioned) in the ground all year. They do just fine with a little winter mulch if it gets below 20F. Both of these are available from most of the larger mail-order nurseries. A Google search will give you more leads than you could ever look at in a normal lifetime. We also grow a number of hardy orchids outside: Bletilla, Pleione, Calanthe, Dactylorhiza, Roscoea, Spiranthes, etc. Some of these do well in full sun, and some appreciate a little light shade during the hot summer afternoons.
----- Original Message ----
From: Franck <email@example.com>
To: Discussion of aroids <firstname.lastname@example.org>
Sent: Saturday, February 23, 2008 4:45:54 AM
Subject: [Aroid-l] Need some advice for aroids in outdoor condition climate zone 7
I would like to put some aroids in outdoor condition in the garden. I
am in a climate zone 7, with hot summer and severe winter (around -10°C
in average to the lower level). What could you advice me as species ? I
have retained some ones but it is just to be sure (Arisaema sp.,
Typhonium sp., Symplocarpus sp.
are the genus I have for example. I
don't write the species because the list is long). And to finish, how
or where can I found some specimens adapted in culture outdoor ?
Thanks a lot for your help
Franck RADNAI - Climate Zone 7
Web site : http://fradnai.free.fr/
Photos : http://picasaweb.google.fr/Franck54280
Long. 6°21' 7" Est
Lat. 48°47'14" Nord