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Zone
Legend is also written below Map
Average Annual
MINIMUM Temperatures
(in
Fahrenheit)
- ZONE 1: Below -50°
- ZONE 2:
-50° to -40°
- ZONE 3: -40° to -30°
- ZONE 4: -30° to -20°
- ZONE 5:
-20° to -10°
- ZONE 6: -10° to 0°
- ZONE 7: 0° to 10°
- ZONE 8: 10°
to 20°
- ZONE 9: 20° to 30°
- ZONE
10: 30° to 40°
- ZONE 11: Above 40°
The Plant Hardiness
Zones,
(also called Climate
Zones),
were set up as a guide to
help determine which plants grow best in
what climates.They are designed to show
the average LOWEST temperature it will
get in each zone every year.With ZONE 1
being the coldest,and ZONE 11 being the
hottest regions.
It began in 1960
when Botanists and Horticulturists
started gathering weather records to
show the average coldest temperature in
each region. The maps were then made by
two independent groups: The Arnold
Arboretum of Harvard University in
Cambridge,Mass; and the United States
Department of Agriculture,(USDA).Today,
the USDA map is generally considered the
standard measure of Plant Hardiness.
With this Hardiness Zone Map,there
is a margin of error however. The
Average Minimum Temperature is not the
only thing that will determine whether a
plant will survive. Other factors are
soil types, length of day, rainfall,
humidity, wind, and Heat.
And now
we have a HEAT-ZONE MAP.
Zone
Legend is also Written Below Map
Average Number of
Days Annually
Temperature Is Over
86°
(Fahrenheit) - ZONE 1:
-1
- ZONE 2: 1 to 7
- ZONE 3: 7 to
14
- ZONE 4: 14 to 30
- ZONE 5: 30
to 45
- ZONE 6: 45 to 60
- ZONE 7:
60 to 90
- ZONE 8: 90 to 120
-
ZONE 9: 120 to 150
- ZONE 10: 150 to
180
- ZONE 11: 180 to 210
- ZONE
12: 210 +plus+
The
HEAT ZONE Map
was set up to
show the average number of days each
region will have temperatures over 86°
(F). The Map is divided into 12 Zones,
showing the annual average of these days
when temperatures will exceed 86° (F).
The temperature 86°(F), is the point at
which plants begin suffering
physiological damage from heat, which
effects branching and leaf growth.
The data used to create the map was
obtained from the archives of the
National Climatic Data Center,(NCDC). It
compiled and analyzed daily high
temperatures recorded between 1974 and
1995. Horticulturists began their
concern for the increase in the number
of "hot" days in the early 1970's,
blaming Global Warming. And it is still
getting worse, seven of the hottest ten
summers ever recorded in the U.S. have
occured since 1990, and they are now saying that the first six month period of 2006 has broke ALL heat records.
This
Heat-Zone Map,like the Hardiness-Zone
Map, still has other areas to consider
when looking at the survival rate for
plants. There are still soil types,
wind, humidity, and other things to
consider. But one main concern with heat
is water supply. Certain plants can take
different amounts of direct heat, but
all plants require extra water during
those harsh hot times. Remember to keep
a check on the water supply of your
outdoor plant. Also remember, shade
cloths and planting locations can help a
plant survive long periods of very hot
weather.
GOD
BLESS AMERICA
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