Zone 1
Below -45.6
C
Below -50
F
Betula
glandulosa (dwarf birch)
Empetrum
nigrum (black crowberry)
Populus
tremuloides (quaking aspen)
Potentilla
pensylvanica (Pennsylvania cinquefoil)
Rhododendron
lapponicum (Lapland rhododendron)
Salix reticulata
(netleaf willow)
Zone 2
-50 to -40
F
-45.6 to -40
C
Betula
papyrifera (paper birch)
Cornus
canadensis (bunchberry)
Elaeagnus
commutata (silverberry)
Larix laricina
(eastern larch)
Dasiphora
fruticosa (shrubby cinquefoil)
Viburnum
opulus var. americanum (American cranberry-bush)
Zone 3
-40 to -30
F
-40 to -34.5
C
Acer
saccharum (sugar maple)
Elaeagnus
angustifolia (Russian olive)
Hydrangea
paniculata (panicle hydrangea)
Juniperus
communis (common juniper)
Lonicera
tatarica (Tatarian honeysuckle)
Malus baccata
(Siberian crabapple)
Parthenocissus
quinquefolia (Virginia creeper)
Spiraea
x vanhouttei (Van Houtte spirea)
Thuja occidentalis
(American arborvitae)
Zone 4
-30 to -20
F
-34.5 to -28.9
C
Berberis
thunbergii (Japanese barberry)
Juniperus
chinensis (Chinese juniper)
Ligustrum
obtusifolium subsp. suave (Amur privet)
Ligustrum
vulgare (common privet)
Parthenocissus
tricuspidata (Boston ivy)
Taxus cuspidata
(Japanese yew)
Zone 5
-20 to -10
F
-28.9 to -23.3
C
Acer
palmatum (Japanese maple)
Cornus
florida (flowering dogwood)
Cotoneaster
microphyllus (small-leaf cotoneaster)
Deutzia
gracilis (slender deutzia)
Euonymus
fortunei (winter-creeper)
Rosa multiflora
(multiflora rose)
Zone 6
-10 to 0 F
-23.3 to -17.8
C
Buxus sempervirens
(common boxwood)
Cedrus
atlantica (Atlas cedar)
Hedera
helix (English ivy)
Ilex opaca
(American holly)
Ligustrum
ovalifolium (California privet)
Prunus
laurocerasus (cherry-laurel)
Taxus baccata
(English yew)
Zone 7
0 to 10 F
-17.8 to -12.3
C
Acer macrophyllum
(bigleaf maple)
Rhododendron
Kurume Group (Kurume azalea)
Ilex aquifolium
(English holly)
Zone 8
10 to 20 F
-12.3 to -6.6
C
Arbutus
unedo (strawberry-tree)
Choisya
ternata (Mexican orange)
Olearia
x haastii (New Zealand daisy-bush)
Pittosporum
tobira (Japanese pittosporum)
Viburnum
tinus (laurustinus)
Zone 9
20 to 30 F
-6.6 to -1.1
C
Asparagus
setaceus (asparagus-fern)
Eucalyptus
globulus (Tasmanian blue gum)
Fuchsia
hybrids (fuchsia)
Grevillea
robusta (silky-oak)
Schinus
molle (California pepper-tree)
Syzygium
paniculatum (Australian brush-cherry)
Zone 10
30 to 40 F
-1.1 to 4.4
C
Bougainvillea
spectabilis (bougainvillea)
Cassia
fistula (golden shower)
Corymbia
citriodora (lemon-scented gum)
Ficus elastica
(rubber plant)
Ensete
ventricosum (Abyssinian-banana)
Roystonea
regia (royal palm)
USDA
Miscellaneous Publication No. 1475. Issued January 1990.
Authored
by Henry M. Cathey while Director, U.S. National Arboretum
Edited,
formatted and prepared for the US National Arboretum web site by Ramon
Jordan, March 1998 & Revised March 2001
U.S. National Arboretum, Agricultural Research Service, U.S. Department of Agriculture,
Washington, DC 20002
Note: This publication is not copyrighted, and permission to reproduce all or any part of it is not required.
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Last Updated January 8, 2009 10:11 AM
URL = http://www.usna.usda.gov/Hardzone/hrdzon4.html