We have one of these on the south end of our lanai. It gets sun from early to mid-morning then is protected by our house the rest of the day. We have it trained to go up a trellis. I has survived two winters without covering it but it is protected by the over-hang of the roof. We were told "IF" they get frost on them, then turn brown, to wait til it's warm in the spring--cut off the brown and it will grow back again. This also applied to our hibiscus. We were told if it appears to "die" from frost to do that same thing. This winter ours flourished...though it did apparently get some aphids which our "bug man" saw and took care of.
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