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gy Pelersbur 
A CLIMATIC MAP 
ee | ae 
dividing the U. S. into temper- y a 
anue ature zones. It is based on aver- eo mL 
age annual minimum temper- ak 
f) atures as they appear in the At- a ie 
ace f las of American Agriculture, U. cae N x 
( SD AE 1936. y: ees 
The boundaries of these zones are not always straight lieve it will thrive nearly everywhere in zone 4 and might 
as indicated, for they are modified by elevation, moun- be tried in parts of zone 3. 
tains, river valleys and other factors. But such zones offer 
a basis for judging possibilities of plant adaptibility. English hollies at least 20 years old are doing well in 
For instance, American holly is growing in northern zone 6 and a few have been reported from zone 5. Hardy 
Illinois, near Detroit and in southern New York so we be- strains of Hex cornuta have been reported in zone 5. 
16 17 
