Thursday, March 19, 2009

hardiness happens

USDA 1990 Hardiness Zone Map

The revised National Arbor Day Foundation 2006 Hardiness Zone Map

In 2006 the National Arbor Day Foundation published its own revised map using data that showed winter lows increasing as much as eight degrees warmer in some places. According to the foundation, the old zones have marched alarmingly northward.

Louise Ducote writing in the March | April 2009 issue of Orion Magazine about the USDA's resistance to replacing their 1990 hardiness zone map, drawn from data gathered from 1974 to 1986, with one that relies on more recent data regarding temperatures in the U.S.

1 comment:

amayer said...

My brother in law owns a company in Washington State that specializes in rehabilitating damaged ecosystems--salmon streams, forests, wetlands and the like.

Sadly, the conservation groups in the Northwest have already concluded that tree species such as the Western Red Cedar will not survive the anticipated climate in 50 years. Already their habitat is marching north into Canada. In a pragmatic way, the remapping is happening already.

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