ASEXUAL PROPAGATION OF PLANTS ON OWN ROOTS 55 



73. Tip layering, in which the tips only of branches are 

 placed in the soil, is illustrated in Fig. 27. The black rasp- 

 berry and loganberry are 

 propagated in this way. 

 74. Simple layering. 

 In this form of layering, 

 the branch is bent over 

 and covered with soil so f 

 as to leave a portion of 

 the top projecting, as 

 shown in Fig. 28. Fre- FlG 27 -~ Tip layer ' showing early growth of tip " 

 quently the top is staked in order to keep it in an upright posi- 

 tion. Usually the portion buried is encouraged to form roots 



by wounding, which is done 

 by scraping the bark, cutting 

 a notch, or twisting. Many 

 varieties of plants can be grown 

 successfully by simple layering. 

 75. Serpentine or compound 

 layering is used frequently 

 when it is desired to produce 

 several plants from a single 

 cane or vine. In this form of layering, the branch is covered 

 with soil at various points where there are buds (Fig. 29); 



FIG. 28. A simple layer. 



FIG. 29. Serpentine layer. 



