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[68] [42] In the coldest of these areas, it may require considerable protection to survive the winter. [69] In the United Kingdom, the Royal Horticultural Society has assigned it hardiness rating H4, [66] indicating that it tolerates temperatures as low as −10 to −5 °C (14 to 23 °F), hardy in most of the country through typical winters. [70]
Tender plants are those killed by freezing temperatures, while hardy plants survive freezing—at least down to certain temperatures, depending on the plant. "Half-hardy" is a term used sometimes in horticulture to describe bedding plants which are sown in heat in winter or early spring, and planted outside after all danger of frost has passed.
As an example, Quebec City in Canada is located in zone 4, but can rely on a significant snow cover every year, making it possible to cultivate plants normally rated for zones 5 or 6. But, in Montreal, located to the southwest in zone 5, it is sometimes difficult to cultivate plants adapted to the zone because of the unreliable snow cover.
Salvia azurea, the azure blue sage, [3] azure sage, blue sage or prairie sage, is a herbaceous perennial in the genus Salvia that is native to Central and Eastern North America. [ 4 ] [ 5 ] Description
Salvia spathacea, the California hummingbird sage or pitcher sage, [2] is a species of flowering plant in the family Lamiaceae, native to southern and central California growing from sea level to 610 m (2,001 ft). This fruity scented sage blooms in March to May with typically dark rose-lilac colored flowers.
Salvia (/ ˈ s æ l v i ə /) [3] is the largest genus of plants in the sage family Lamiaceae, with just under 1,000 species of shrubs, herbaceous perennials, and annuals. [4] [5] [6] Within the Lamiaceae, Salvia is part of the tribe Mentheae within the subfamily Nepetoideae. [4]
The end of summer is when mums really hit their stride. Learn the best way to grow mums, whether as annuals or perennials, and find out how to care for them.
Insect winter ecology describes the overwinter survival strategies of insects, which are in many respects more similar to those of plants than to many other animals, such as mammals and birds. Unlike those animals, which can generate their own heat internally ( endothermic ), insects must rely on external sources to provide their heat ...