Orostachys spinosus. Plant & Plant photo: Mario Couvreur, Belgium
If you are looking for a succulent that takes cold down to -35C (-30F), Orostachys, (Crassula family) are worth considering for your outdoor garden.
As examples, a grower in Russia reports both Orostachys spinosa and O. malacophylla are hardy to at least -30F (-35c)
More on Orostachys and other cold hardies along with two excellent articles (one on how to get started with cold hardy plants) coming in our September, 2000 issue … Vol. 12 No. 3. 24.5.00
Update: Found a wonderful photo of Mario Couvreur.
Rescued from The Wayback Machine. Plant photographs and content are © Copyright THE AMATEURS’ DIGEST. The photographs may be downloaded for personal use only, but not the one of Mario, himself, in his greenhouse. Mario was kind enough to leave his photo as a tribute to Marina.