Winter frost resistance of leaves of some plants growing in Dunedin, New Zealand, in winter 1985

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Abstract
The frost resistance of leaves of eleven different species of plants was measured in late July and early August 1985 when winter hardening to frost would be expected to be near its maximum. The frost resistance of the native plants was generally low (-5°C to -8°C except for Hebe albicans (—10°Q), but similar to previous studies. The exotic species originated from warm (mediterranean to subtropical) climates and were usually at least as frost resistant as the natives; although they included the species with both the least and greatest frost resistance Datura sanguinea (—2°C) and Magnolia grandiflora (—15°C) respectively).