[Chap. XXXV 



VEGETATIVE MULTIPLICATION 



403 



dozen runners from 3 to 10 feet in length may grow from a single 

 strawberry plant during one season. Roots and shoots of new strawberry 

 plants develop at every other node of each runner. Secondary runners 

 develop from the alternate nodes and also from the new strawberry 



Fig. 177. Clones of strawberry plants develop from runners. Note the regular 

 occurrence of new shoots and secondary runners at alternate nodes. 



plants. By this means a clone of a score or more strawberry plants may 

 develop from a single plant during one summer. Under cultivation, the 

 new plants may be lifted from the soil and reset in rows. In nature they 

 become separated by the death of the connecting runners. 



Fig. 178. Tip-layering of black raspberry. In late summer when the ends of 

 the branches bear very small leaves and have a rat-tail appearance, they are 

 buried vertically in holes dug in the soil (A). After adventitious roots have de- 

 veloped from the buried nodes the stem tip begins to grow upward (B). The 

 rooted tips with a portion of the old canes attached are dug up and reset early 

 the following spring before the tip has emerged from the soil. 



