208 



PLANT PROPAGATION 



though the trees are rather slower but produce better 

 ripening, smoother fruit. Lime stocks make trees sen- 

 sitive to cold and give too many failures. 



Investigation has shown that for Florida, orange grow- 

 ers prefer rough lemon stock for "high pine" lands. Sour 

 stock is considered better than sweet stock for all kinds 

 of land. In Louisiana, sour stock is preferred by about 

 90 per cent of the planters. California growers who have 

 tried sweet and sour stocks side by side on a large scale 

 give data which warrant the conclusions : 1, that sour 

 stock trees make more thrifty growth ; 2, are freer 

 from disease and are fully resistant to "foot rot" ; 3, less 

 liable to injury by cold while young; 4, the quality of 

 the fruit is not impaired. 



FIG. 172 ENGLISH "CLEFT" GRAFT 



A, Improper angle for large cuttings, should not be parallel but slightly away 

 from long side; B, ditto for small cuttings; C, D, proper angle for tongues; 

 E, F, uniting and tying. 



Orange on Citrus trifoliata stocks in California have made good 

 growth in open culture. Satsuma and other varieties of the Man- 

 darin class at five to nine years old were eight to ten feet high. 

 This stock appears to resist drouth especially well, and the varieties 

 of orange and other citrus fruits grafted on it appear to stand 10 

 degrees more cold than on other stocks and also to come earlier 

 into bearing. 



Seeds from only mature specimens should be saved for 

 growing seedlings. It should be plump. Culls and 

 drops allowed to rot are used, the seed being washed out 

 and air dried after sifting in a strong stream of water. 

 When the ground is warm enough the seed is sown in 



