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Hopkins' bioclimatic law states that in North America east of the Rockies, a 130-m (400-foot) increase in elevation, a 4° change in latitude North (444.48 km), or a 10° change in longitude East (two-thirds of a time zone) will cause a biological event to occur four days later in the spring or four days earlier in the fall. [1]
The plants have tall spikes of purple flowers resembling bottle brushes or feathers that grow 1–5 ft (0.30–1.52 m) tall. The species grows in hardiness zones 3 - 8, [ 4 ] stretching from the Midwest to the East Coast, eastern and western Canada.
Asclepias syriaca, commonly called common milkweed, butterfly flower, silkweed, silky swallow-wort, and Virginia silkweed, is a species of flowering plant. [2] [3] It is native to southern Canada and much of the United States east of the Rocky Mountains, excluding the drier parts of the prairies. [4] It is in the genus Asclepias, the milkweeds ...
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Lepidoptera societies and the PLANTS Database of the United States Department of Agriculture's (USDA's) Natural Resources Conservation Service provide state and county-level distribution maps of specific plants. [17] Published lists of host plants for butterflies and other pollinators can help select the plant species desired in the garden. [18]
In fact, fall actually is an ideal time for adding new perennials and shrubs to your garden to add beauty, privacy, and pollinator-friendly plants. In the Southeast, the toughest growing season ...
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