3 1 2 Plums and Plum Culture 



limits exactly determined. The general northward 

 range of two well-known varieties is shown in the map, 

 Kelsey is doubtless the most tender of the com- 

 moner varieties. Most of those generally grown ap- 

 proach very nearly the hardiness of Burbank. 



Americana group. These are hardy anywhere 

 where agriculture can be practiced. 



Nigra group. These varieties have the same 

 range in cultivation as those of the preceding group. 



DIAGRAM SHOWING APPROXIMATE NORTHERN LIMIT OF THE 

 SUCCESSFUL CULTURE OF BURBANK AND KELSEY PLUMS. 



Wildgoose group. Wildgoose, the best-known va- 

 riety of the group, has been widely tested and is known 

 to succeed fairly well to the south of the line shown 

 on the map, on the following page, and to be unreliable 

 north of that line. 



Several of the other varieties of this group seem to 

 come up to this line fairly well. 



Miner group. These varieties are almost as hardy 

 as the Americanas, but not quite. They succeed as 



