I am in South Florida, so not sure if that is OK; the climate may be a little different. I have so much Chaya ( Cnidoscolus aconitifolius ), I don't know what to do with it. The branches will grow anywhere I stick them in the ground. They are a non-stinging variety, and very tasty, with a nice crunch even after 12 minutes of boiling. I also have pigeon pea but not much seeding right now. I have 2 Katuks but both are juveniles, maybe ready to clip within the next year. Also, cranberry hibiscus should be big enough to clip within the year.
I can't get rid of the Chaya once I tell people about the Cyanide. If you want to trade some for some southern blackberry clippings, let me know.
--Chris