The foliar frost resistance of Pittosporum eugenioides, P. obcordatum, P. tenuifolium, and P. crassifolium increased from -6°C to -8°C in March and April to between -9°C and -10°C in July. Leaves of P. obcordatum had the lowest frost resistance (-7°C) in April, but showed the highest resistance (
CITATION STYLE
Bannister, P., Colhoun, C. M., & Jameson, P. E. (1995). The winter hardening and foliar frost resistance of some new zealand species of pittosporum. New Zealand Journal of Botany, 33(3), 409–414. https://doi.org/10.1080/0028825X.1995.10412967
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