CULTIVATION AND PROPAGATION 



43 



For Pimis Jeffreyi, P. attenuata, P. ponderosa var. pendula, and 

 all other forms P. pojiderosa stock should be used. All pines re- 

 sembling P. nigra var. austriaca should be grafted on that stock. 

 Pinus Strohus varieties should be grafted on that species, as 

 well as P. cemhroides vars. monophylla and edulis, P. Bungeana, 

 P. flexilis, and P. aristata. For P. Mugo and its var. Mughus, 

 P. rigida, and varieties of P. sijlvestris, the latter should be 



5. One-year grafts. — From left to right: Abies numidica, 

 Pinus cembroides var. edulis, Picea Breweriana. 



employed. Pinus resinosa must be used for its varieties as they 

 will not grow on any other stock. Varieties of tsuga should be 

 grafted on T. canadensis, and forms of pseudotsuga on P. taxifolia. 



Plenty of sand should be used in the propagating bench. 

 To prevent the heat from scorching the roots, the pots should 

 be plunged in the sand and given moderate bottom heat. 

 Plants potted a year before should not be plunged as they will 

 start to grow without this treatment. 



The time for grafting is when the plants show young roots. 

 The graft should be placed as near the root as possible, 



