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Klicka på [Svenska Fuchsiasällsakpet]
om du vill se en massa fuchsior
(US Department of Agriculture)
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Corresponding Zones
in Europe Motsvarande
zoner i Europa Sweden's
"Own Zoning" (External link in new
window))Sveriges egen zonindelning (Extern
länk öppnas i nytt fönster)USDA (?) Zones in Canada (N.B.! External Link from here) 
Range of average annual minimum temperatures
Zone 3 (-35 F) (-37
C)
Zone 4 (-25 F) (-32
C)
Zone 5 (-15 F) (-26
C)
Zone 6 (-5 F) (-21
C)
Zone 7 (5 F) (-15
C)
Zone 8 (15 F) (-9
C)
Zone 9 (25 F) (-4
C)
Zone 10 (35 F) (+2
C)
A plant's winter hardiness is critical in deciding whether it is suitable
for your garden. Basic laboratory testing can easily determine the lowest
sustained temperature a particular plant species can withstand, but how
does that relate to your garden?
In an attempt to answer this question for gardeners, years ago botanists
and horticulturists started gathering weather records throughout North
America to compile a database to show the average coldest temperatures
for each region. These records were condensed into a range of temperatures
and transformed into various zones of plant hardiness. Maps were then constructed
to delineate these temperature zones.
The climatic studies and subsequently created maps were undertaken by two
independent groups: The Arnold Arboretum of Harvard University in Cambridge,
Massachusetts, and the United States Department of Agriculture (USDA) in
Washington, D.C. The two maps reflected some variances, but in recent years,
the differences between the Arnold Arboretum and the USDA have narrowed.
Today, the USDA map, which was last updated and released in 1990 (based
on weather records from 1974-1986), is generally considered the standard
measure of plant hardiness throughout much of the United States.
But many gardening enthusiasts in the West have long been dissatisfied
with the USDA system of averaging temperatures. Western gardeners are well
aware that the combined influences of the Pacific Ocean, desert regions,
and the Sierra Nevada and Cascade mountain ranges provide the West with
unique weather conditions and patterns. Naturally these conditions affect
what gardeners can grow in their local areas. The differences between neighboring
regions are substantial enough that information for baseline zones in the
Midwest, South, and Northeastern states often do not apply in western states.
Growing Zones in Europe corresponding to USDA zones above.
Up to USA!
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