Zone |
Botanical (and
Common) Names |
1
Below -50 F
(Below -45.6 C) |
Betula glandulosa
(Dwarf birch)
Empetrum nigrum (Crowberry)
Populus fremuloides (Quaking aspen)
Potentilla pensylvanica (Pennsylvania cinquefoil)
Rhododendron lapponicum (Lapland rhododendron)
Salix reticulate (Netleaf willow) |
2
50 to -40 F
(-45.6 to -40 C) |
Betula papyrifera
(Paper birch)
Cornus canadensis (Bunchberry dogwood)
Elaeagnus commutata (Silverberry)
Larix laricina (Eastern larch)
Potentilla fruticosa (Bush cinquefoil)
Viburnum trilobum (American cranberry bush) |
3
40 to -30 F
(-40 to -34.5 C) |
Berberis thunbetgii
(Japanese bayberry)
Elaeagnus angustifolia (Russian olive)
Junipercus communes (Common juniper)
Lonicera tatarica (Tatarian honeysuckle)
Malus baocata (Siberian crabapple)
Thuia occidentalis (American arborvitae) |
4
30 to -20 F
(-43.5 to -28.9 C) |
Acer saccharum (Sugar
maple)
Hydrangea paniculata (Panicle hydrangea)
Juniperus chinensis (Chinese juniper)
Ligustrum amurense (Amur River privet)
Parthenocissus quinquefolia (Virginia creeper)
Spiraea x vanhouttei (Vanhouffe spirea) |
5
20 to -10 F
(-28.9 to -23.3 C) |
Cornus florida
(Flowering dogwood)
Deutzia gracilis (Slender deutzia)
Ligustrum vulgare (Common privet)
Paithenocissus tricuspidata (Boston ivy)
Rosa multiflora (Japanese rose)
Taxus cuspidata (Japanese yew) |
6
10 to 0 F
(-23.3 to -17.8 C) |
Acer palmatum
(Japanese maple)
Buxus sempervirens (Common boxwood)
Euonymus follunei (Winter creeper)
Ilex opaca (American holly)
Ligustrum ovalifolium (California privet) |
7
0 to 10 F
(-17.8 to -12.3 C) |
Acer macrophylium
(Bigleaf maple)
Rhododendron Kurume hybrids (Kurume azalea)
Cedrus atlantica (Atlas cedar)
Cotoneaster microphylla (Small-leaf cotoneaster)
Ilex aquifolium (English holly)
Taxus baccata (English yew) |
8
10 to 20 F
(-12.3 to -6.6 C) |
Arbutus unedo
(Strawberry tree)
Choisya temata (Mexican orange)
Olearia haastii (New Zealand daisy-bush)
Pittosporum tobira (Japanese pittosporum)
Prunus laurocerasus (Cherry-laurel)
Viburnum tinus (Laurestinus) |
9
20 to 30 F
(-6.6 to -1.1 C) |
Asparagus setacous
(Asparagus fern)
Eucalyptus globulus (Tasmanian blue gum)
Syzygium paniculatum (Australian bush cherry)
Fuchsia hybrids (Fuchsia)
Grevillea robusta (Silk-oak)
Schinus molle (California pepper tree) |
10
30 to 40 F
(-1.1 to 4.4 C) |
Bougainvillea spectabilis
(Bougainvillea)
Cassia fistula (Golden shower)
Eucalyptus citriodora (Lemon eucalyptus)
Ficus elastica (Rubber plant)
Ensete ventricosum (Ensete)
Roystonea regia (Royal palm) |