74 LUTHER BURBANK 



Now the stock is ready for grafting. The 

 stock branches selected for this purpose should 

 not be over two or three inches in diameter. The 

 cions grow rapidly and an orchard produced in 

 this way surpasses all others. Its trees have a 

 natural black walnut vigorous system of roots, 

 with undisturbed tap root. A year's growth has 

 been saved by not transplanting, and a start 

 equivalent to the growth of several years has been 

 gained by using the faster-growing hybrid. 



So the English walnut grafted on this stock 

 becomes a producing tree at a very early age, and 

 an orchard of English walnuts thus grafted is 

 worth perhaps at least twice as much as one on its 

 own roots. 



The tree thus grafted has not only the advan- 

 tages mentioned, but it is more wide-spreading 

 and therefore more productive than the original 

 tree; and the spread of limb is duplicated by the 

 root system, which thus insures a good supply of 

 nourishment and the capacity to produce large 

 crops even in dry seasons. 



We have seen that the hybrid walnuts of both 

 the Paradox and the Royal types have the pecul- 

 iarity of producing trees of quick growth and 

 gigantic stature in the first filial generation, and 

 a mixture of dwarfs and giants in the second 

 generation. 



