Most, if not all, of the nut tree nurseries are making a study of 
the different varieties of nut trees. We have under test at present 
living grafts of more than 100 different named varieties of hickories 
and hickory hybrids, 40 varieties of black walnuts, 6 named varieties 
of Persian (English) walnuts and more than 50 seedling varieties of 
the Crath Carpathian varieties, 8 varieties of Asiatic heartnut and 
several varieties of Chinese and hybrid chestnuts. 
Northern nut tree nurseries are members of the Northern Nut 
Growers Association and through contact with the other nut 
enthusiasts and the study of their reports on their experiences and 
experiments gain much knowledge of nut tree culture and the merits 
of different varieties. 
But we, as with other nut tree nurseries and the other nut tree 
enthusiasts, do not know all of the answers—we are like a band of 
explorers traveling through an unknown land; we do not know what 
lies over the next hill or around the next curve. Also, as with all 
travelers, each of us cannot see each detail, but very little will escape 
the gaze and attention of the entire body. This past winter has been 
such a hill with us—it has taught us that very few varieties of the 
Persian (English) walnuts will escape injury by temperatures as low 
as — 34° F. (although very few of our hardy varieties suffered serious 
injury), whereas all varieties of Asiatic heartnuts which we have 
under test did not show any injury from this low temperature and 
blossomed and bore fruit normally this season. 
THE HEARTNUT 
(Juglans Cordifernius) 
A varietal form of an Asiatic walnut. The trees are rapid 
growing, very ornamental, wide spreading, excellent as a lawn 
tree. While the shade is dense, grass grows well under it. 
A real nut tree for the far North as well as for the South. It is 
a real ornamental, especially for the lawn; it is rather too spreading 
to make a real good street tree. 
This past winter (1942-1943) we experienced the very low 
temperature of — 34° F. yet none of the varieties of heartnut we have 
under test showed any injury at all. As the nuts ripen early they 
should succeed and mature their crops in the far North, probably 
anywhere in the United States and many parts of Canada. 
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