Growing orchids outside in NZ is easier than you think

Orchids are one of the oldest and most diverse plant families, so it's no wonder there are plenty that will grow well outside in Kiwi gardens.

Though most prefer milder parts of the country, many are moderately frost-hardy if you site them carefully. 

Raising them off the ground is a good first step, not only to show off the blooms but also to protect them from frost in winter. The embrace of an evergreen tree rather than a deciduous one is another good way to cosset your orchids from the cold – the shelter from rain being as important as keeping them from getting too cold.

from
http://www.stuff.co.nz/life-style/home-property/82483772/Growing-orchids-outside-in-NZ-is-easier-than-you-think