New Zealand Journal of Crop and Horticultural Science abstracts
Seasonal frost tolerance of Hebe species and cultivars
I. J. WARRINGTON
R. C. SOUTHWARD*
The Horticulture and Food Research
Institute of New Zealand
Private Bag 11 030
Palmerston North, New Zealand
*Present address: Seed Technology Centre, Massey University,
Palmerston North, New Zealand.
Abstract The frost hardiness temperature (i.e., the
temperature that causes damage) and the lethal temperature (i.e., the
temperature that causes death) were assessed in summer (January) and winter
(July) for 35 Hebe species, cultivars, and hybrids. Frost hardiness was
also assessed in both autumn and spring for a limited number of these
selections. The amount of frost tolerated in summer, when assessed using the
frost hardiness temperature, ranged from only -1.5deg.C (H.
diosmifolia (spring flowering type)) to -4.5deg.C (H. albicans,
H. cupressoides, H. macrantha var. macrantha, H. odora, H. odora
`Anomala', H. odora `Buxifolia', H. pimeleoides `Graeme
Paterson', H. aff. pimeleoides, H. propinqua, H. recurva, H. topiara, H.
`Emerald Gold', and H. x youngii) and, when assessed using
lethal temperature, from -2.4deg.C (H. `Inspiration') to -8.1deg.C
(H. cupressoides.). In winter the frost hardiness temperature ranged
from -2.4deg.C (H. diosmifolia (spring flowering type) and
H. `Inspiration') to -8.1deg.C (H. cupressoides) and the
lethal temperature ranged from -4.5deg.C (H. diosmifolia (spring
flowering type), H. elliptica var. elliptica and H.
`Inspiration') to -12.9deg.C (H. cupressoides and H. propinqua).
We present information on hardiness levels that challenges the current
classification of some of the material based on hardiness zones.
Keywords cold hardiness; frost hardiness temperature; lethal
temperature; Hebe species; Hebe cultivars
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
437-445
0114-0671/95/2304-0437 $2.50/0 (c) The Royal Society of New Zealand
1995
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