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Flora
of the Northern Hemisphere
Woody plants are more sensitive indicators of this zone than herbaceous plants, being less easily protected from heavy frost by soil or snow cover. Unlike their deciduous counterparts, many temperate evergreens have their cold limit at or around Zone 7. One such is a magnolia grandiflora, a typical Zone 7 tree from the southern USA, and widely planted elsewhere in the world. Similarly, many of the Chinese evergreen rhododendron species are not hardy below Zone 7.
Certain plants are readily grown right across the zone, others are much more sensitive to climatic factors such as summer temperatures, rainfall, and humidity. For example, some plants that are hardy down to Zone 6 or even Zone 5 in hot dry continental regions will hardly cope with winter in oceanic climates of Zone 7, such as those of southwestern Canada and Scotland, because they enter the winter with their aerial growth less hardened and their root systems wetter. Rose of Sharon is one such example.
For the same reason, the Scottish Highlands and the Pacific Northwest (of North America) are excellent for trees and shrubs from the cold wet parts of Chile and New Zealand, or from Himalayan areas with wet summers. The British horticulturist Ken Beckett, who has made several studies of plant hardiness, considers that gardeners in British Isles should choose plants rated to one zone more hardy than that in which they garden.
The greatest horticultural wealth for the zone is to be found in the plants from the mountains of Japan, China, and the Himalayas. Native to this region are the many hardy rhododendron species, which have given rise to a multitude of hybrids, and the magnificent flowering cherries, developed mainly in Japan although some of their wild progenitors may have come from China.
In the southern interior of the USA, there is a wealth of native plant life for gardeners, in particular, annuals and perennials for the daisy family. Some of the many colorful perennials and sub shrubs in the genus are also centered in Zone 7.