If this is Muehlenbeckia, I'm not sure it would be hardy in your zone. I grew it for several years in zone 8 but lost it...but I can't say definitely if it was due to cold temps...may have been in too heavy soil. I'd start a pot for carrying over inside for winter if I were to try again.

Good luck. It's always fun to try. Often a protected spot under eaves close to house will give a few degrees extra warmth. I'd try a bit in several locations, plus some in a pot - just in case. josh

Here is a link that might be useful: Muehlenbeckia complexa

Enjoy it now - it's unlikely to winter over for you. And no concerns about heat - New Zealand's climate is quite diverse, from alpine areas to subtropical regions - but the bulk of the country has climates that are the equivalent of our zone 8 or higher and most plants with New Zealand origins will need very mild climate zones to survive.

I am on the edge of zones 7b and 8a. I have grown creeping wire vine for years as a ground cover - and as a 'green mulch'. It is evergreen and gorgeous year round for me. I absolutely love it!