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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

While working on a list of synonyms of European White...

Roderick Cameron | Aug 24, 2026

Report led by The Morton Arboretum will help prioritize oak...

Website Editor | Aug 06, 2026

Motivation I live in the village of Dolné Dubové...

Jozef Čapkovič | Jul 20, 2026

The only oak species endemic to Africa is rare in cultivation. It shouldn't be.

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