hydroid

My experience has been that the Goldfinger is not that cold tolerant for my area, but they always come back every year. Namwah has been pretty cold tolerant for me also.
I always recommend Orinoco as a beginners plant because they seem to be tough and durable under most extreme conditions and it always helps if a first time grower has success (like the old timex commercial) "Takes a licking and keeps on ticking". I've also had very good luck in cold with Saba. Hope this helps.
Bo