
Map of Climatic Zones from Manual of Cultivated Trees and Shrubs by Alfred Rehder 
of Arnold Arboretum. The figures at ends of lines separating the zones show lowest 
average temperatures of the coldest single month on record. Look at figure III. and you 
will appreciate how elevation, air drainage, water bodies and other local conditions 
may have much influence in affecting the way trees will survive in particular locations. 
Therefore this map is only an approximate guide. The heavy line (170) marks average 
length of frost free season of 170 days. Lewisburg, Pa., is just above it on the Susque- 
hanna River. Note this line again near Great Lakes. Remember that this line is an 
average. Some seasons are shorter and some are longer. In Pennsylvania, a careful 
study of the records shows that in one-fourth of the years the growing season is three 
weeks longer than the average. That fact makes it possible for a Pecan tree to come 
through with an occasional crop much farther north than it can be depended upon to 
ripen its nuts. But it is an ornament every year. So is every other tree on our list. 
and propagated, and you can now buy 
little trees with every expectation that 
they will yield nuts which you can crack 
in your hand, which will yield their ker- 
nels in entire halves and have a quality 
that is not only the equal of any Pecans 
from the South, but better. 
Beat George Washington 
It is now easy for you to beat George 
Washington in the Pecan business, be- 
cause you can plant better trees than he 
could plant. You can plant grafted trees. 
He only had seedlings, and if there is any 
gamble that is loaded against you it is 
planting seedling Pecan trees. I’ve seen a 
row of them in southern Illinois planted 
from the best seed they could find. None 
gave nuts like the original seed, no two 
were alike, and nearly all were virtually 
worthless. 
You can beat George Washington easily 
because the tens of thousands of wild trees 
of the Ohio Valley have been carefully 
searched, the best trees have been found 
Pecans of Highest Quality 
At a national Pecan show at Mobile, 
Alabama, with all the big Pecans of the 
South present, the first prize for quality 
went to a Pecan from the Ohio Valley, the 
place our varieties originated. Why this 
high quality? It is a fact well known in 
horticultural science that many varieties 
of fruit and nuts often produce their best 
