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The zones are defined by steps of 5 degrees Celsius, from −15–−10 °C for zone 1 to 15–20 °C for zone 7. [19] They are numerically about 6 lower than the USDA system. For example, Australian zone 3 is roughly equivalent to USDA zone 9.
Rhododendron periclymenoides, the pink azalea [1] or pinxter flower, is a species of shrub in the heath family Ericaceae. It is native to eastern North America, where it is widespread from Alabama to New Hampshire. [2] It is often found in riparian areas, in wet to dry forests. [3]
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Rhododendron occidentale, the western azalea [1] or California azalea, is one of two deciduous Rhododendron species native to western North America (the other is Rhododendron albiflorum). The western azalea is known to occur as far north as Lincoln and Douglas Counties in Oregon and as far south as the mountains of San Diego county.
According to the new map released in November 2023, about half of the United States has shifted to a new hardiness zone. That's really big news if you consider 80 million Americans use this map to ...
NRCS (USDA), "Plants Database", United States Department of Agriculture (USDA) This is the template sandbox page for Template:Cite usda plants ( diff ). See also the companion subpage for test cases .
The Azalea Society of America designated Houston, Texas, an "azalea city". [citation needed] The River Oaks Garden Club has conducted the Houston Azalea Trail every spring since 1935. [citation needed] Valdosta, Georgia is called the Azalea City, as the plant grows in profusion there. The city hosts an annual Azalea Festival in March.
This list of horticulture and gardening books includes notable gardening books and journals, which can to aid in research and for residential gardeners in planning, planting, harvesting, and maintaining gardens. Gardening books encompass a variety of subjects from garden design, vegetable gardens, perennial gardens, to shade gardens.