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Sempervivum (/ s ɛ m p ə ˈ v aɪ v əm / [1] [2]) is a genus of about 40 species of flowering plants in the family Crassulaceae, commonly known as houseleeks.Other common names include liveforever (the source of the taxonomical designation Sempervivum, literally "always/forever alive") and hen and chicks, a name shared with plants of other genera as well.
The plants grow close to the ground with leaves formed around each other in a rosette, and propagating by offsets. The "hen" is the main, or mother, plant, and the "chicks" are a flock of offspring, [1] which start as tiny buds on the main plant and soon sprout their own roots, taking up residence close to the mother plant.
Growing to 15 cm (6 in) tall by 50 cm (20 in) broad, it is a rosette-forming succulent evergreen perennial, spreading by offsets. It has grey-green, tufted, sessile leaves, 4–10 cm (2–4 in) in diameter, which are often suffused with rose-red. In summer it bears clusters of reddish-purple flowers, in multiples of 8–16, on hairy erect flat ...
Gardeners, take note! The USDA released a new hardiness zone map and half of the country has shifted. ... the types of plants that are able to grow successfully has changed for 50 percent of the ...
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.
In 2006, the Arbor Day Foundation released an update of U.S. hardiness zones, using mostly the same data as the AHS. It revised hardiness zones, reflecting generally warmer recent temperatures in many parts of the country, and appeared similar to the AHS 2003 draft. The Foundation also did away with the more detailed a/b half-zone delineations. [6]
This is a list of countries and territories of the world according to the total area covered by forests, based on data published by the Food and Agriculture Organization of the United Nations (FAO). In 2010, the world had 3.92 billion hectares (ha) of tree cover , extending over 30% of its land area.
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