200 CITRUS FRUITS AND THEIR CULTURE. 



As a stock for the Satsuma, the sour orange is a 

 failure. When worked on sour stock, this variety makes 

 a stunted, unsatisfactory growth; in short, it is a total 

 failure. Why this should be so it is difficult to say, but 

 for some reason or other the union is decidedly uncongen- 

 ial. In certain cases the same condition is noted when 

 the stock is used for kumquats, but in the majority of 

 instances it is quite satisfactory. 



ROUGH LEMON (C. LJMONUM). 



The rough lemon tree is not so hardy as the sweet 

 orange and is more liable to damage by cold than the pom- 

 elo. Of all the stocks commonly used for citrus trees it 

 is the most susceptible to damage by cold and hence can- 

 not be expected to increase the hardiness of the top, but 

 on the contrary, it is inclined to make it less hardy. In 

 southern Florida it grows wild and appears to be per- 

 fectly adapted to its surroundings, but it is not found in 

 the northern portion of the State, being much too tender 

 to stand the climate of the more exposed sections unless 

 protection is afforded. 



The main roots of this stock show a wide variation. 

 In all instances the crown roots extend a good distance 

 from the trunk and a good tap root is produced. But in 

 some individuals, here and there, these large lateral roots 

 lie quite close to the surface and most of the feeding roots 

 are in the top fifteen inches of soil. On the other hand, 

 most trees worked on this stock have the roots well dis- 

 tributed through the soil. A root system of this kind 

 is particularly desirable for dry soils and for those which 

 need irrigation. 



Rough lemon stock is capable of inducing a more 

 rapid growth in the top worked on it than any other kind 



