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For example, Seattle, Washington, and the city of Austin, Texas, are both in the USDA hardiness zone 9a because the map is a measure of the coldest temperature a plant can handle.
This towering native plant can reaching 7 feet tall. It’s a hardy perennial in Zones 3-9 and grows well in dry-to-moderate soil moisture. Plant these as a winter sowing or cold stratify them for ...
You can continue to plant every few weeks up until early to mid-summer for a longer harvest time. But if you plant too late in your hardiness zone, your sunflowers won't mature before the first frost.
For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [20]
Perennial sunflower is a crop of sunflowers that are developed by crossing wild perennial and domestic annual sunflower species. Annual sunflower is a major oilseed crop. Genes from wild perennial relatives may increase root depth and mass and extend the growing season. These upgrades means future varieties with higher yields and better soil ...
Tithonia diversifolia is a species of flowering plant in the family Asteraceae that is commonly known as the tree marigold, [2] Mexican tournesol, Mexican sunflower, Japanese sunflower or Nitobe chrysanthemum. It is native to Mexico and Central America but has a nearly pantropical distribution as an introduced species. [1]
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Heliopsis helianthoides is a species of flowering plant in the family Asteraceae, known by the common names rough oxeye, [2] smooth oxeye [3] and false sunflower. [4] It is native to eastern and central North America from Saskatchewan east to Newfoundland and south as far as Texas , New Mexico , and Georgia .