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Databases & Directories
	Quercus Portal Quercus Portal provides access to various databases regarding genetic and genomic resources and information. It includes also a dynamic user interface allowing the submission of complex queries across all data bases (Global Search). Additionally a static section of the portal is devoted to general...Visit site
	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. ...Visit site

Editor's Picks

"Japanese oaks" planted at Coventry Cathedral

Steve Potter | Dec 21, 2025

Six days exploring Oaxaca’s oak diversity, as reported by...

Wally Wilkins | Dec 10, 2025

Oaks planted in circles as a continuation of the artwork...

Steve Potter | Dec 10, 2025

Chestnut-leaf oak in habitat and in cultivation

Databases & Directories
	Quercus Portal Quercus Portal provides access to various databases regarding genetic and genomic resources and information. It includes also a dynamic user interface allowing the submission of complex queries across all data bases (Global Search). Additionally a static section of the portal is devoted to general...Visit site
	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. ...Visit site