Editor's Picks
The Morton Arboretum, in collaboration with Botanic Gardens...
Website Editor
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Jul 17, 2019
Stelian Radu, a founding member of the IOS, accomplished an...
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Jun 16, 2019
Scientists in Poland have successfully micropropagated 500...
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May 30, 2019
Plant Focus
Quercus look is one of the least-known oaks of the arid mountains of the Middle East. It grows on Mount Hermon and in the Anti-Lebanon...
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.
