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The boundaries of these zones are not always straight 
as indicated, for they are modified by elevation, moun- 
tains, river valleys and other factors. But such zones offer 
a basis for judging possibilities of plant adaptibility. 
For instance, American holly is growing in northern 
Illinois, near Detroit and in southern New York so we be- 
16 
t = Lyramieo Che 
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es 7 / i hes 
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Okmulgee or ail fan pune Fe 
t ES MISSIS \ 4 “a Columbie fF 
title Rock | ‘ 
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= 
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MICHIGAN 
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Uourtono 
A CLIMATIC MAP 
dividing the U. S. into temper- 
vote Ature zones. It is based on aver- 
age annual minimum temper- 
atures as they appear in the At- 
las of American Agriculture, U. 
So ID, Ale, IOBE, 
lieve it will thrive nearly everywhere in zone 4 and might 
be tried in parts of zone 3. 
English hollies at least 20 years old are doing well in 
zone 6 and a few have been reported from zone 5. Hardy 
strains of Hex cornuta have been reported in zone 5 
ey, 
