Abstract
The frost hardiness of the shoots of individual trees within two Chilean provenances of Nothofagus procera (Poepp & Endl.) Oerst. was measured once in each of the months January, February, November and December 1989 and January and February 1990. There were significant ( P <0.05) differences of frost hardiness between provenances but only one tree could be shown to be significantly more frost hardy than the others within the same provenance. During the winter of 1989/90 both provenances were hardy to about −14°C (temperature killing 50 per cent of shoots) in December, but the shoots dehardened to about −9°C in January before hardening again in February. This pattern of alternate hardening and dehardening seemed to mirror changes in air temperature and could render N. procera liable to frost damage where (as happened in 1988/9 in the UK) mild spells occur in winter followed by severe frosts.
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