Editor's Picks
An intercontinental artifical hybrid raised at Arboretum...
Roderick Cameron
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Apr 12, 2020
David More shares some of his magnificent illustrations of...
David More
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Apr 08, 2020
A project aims to recover and restore habitats in Serra de...
Justin Roborg-Söndergaard
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Apr 07, 2020
Plant Focus
First described by the Japanese botanist Bunzō Hayata in 1913, Quercus hypophaea is a medium to large evergreen oak restricted to the...
USDA Plant Hardiness Zone Map
In January 2012, the USDA Agricultural Research Service released a new edition of the American Plant Hardiness Map. The previous edition was released in 1990. Two new zones 12 and 13 have been added to this 2012 edition. The zones are based on 1976-2055 weather data, that is 30 years of data. The 1990 edition was based on 13 years of data. See the What's new section of the USDA ARS Web site for details here.
For the first time, the map is available as an interactive GIS-based map.
