Zone 6
Average annual minimum temperature -10 to 0 degrees

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
Average annual minimum temperature 0 to 10 degrees

Acer macrophyllum (bigleaf maple)
Rhododendron Kurume Group (Kurume azalea)
Ilex aquifolium (English holly)

Zone 8
Average annual minimum temperature 10 to 20 degrees

Arbutus unedo (strawberry-tree)
Choisya ternata (Mexican orange)
Olearia x haastii (New Zealand daisy-bush)
Pittosporum tobira (Japanese pittosporum)
Viburnum tinus (laurustinus) 

Zone 9
Average annual minimum temperature 20 to 30 degrees

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
Average annual minimum temperature 30 to 40 degrees

Bougainvillea spectabilis (bougainvillea)
Cassia fistula (golden shower)
Corymbia citriodora (lemon-scented gum)
Ficus elastica (rubber plant)
Ensete ventricosum (Abyssinian-banana)
Roystonea regia (royal palm)

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