68 THE NURSERY-MANUAL 



stock species of herbaceous border plants as aquilegias, 

 hemerocallis, helianthus are commonly grown in permanent 

 small areas by nurserymen, and plants are cut out of the 

 plot as orders are received. If, however, the nurseryman is 

 making a special "run" on any plant, he gets his stock by 

 dividing up the crowns or rootstocks into small portions, and 

 then growing these for a season in specially prepared beds,, or 

 sometimes in pots. 



Recent experience has shown that etherization of plants 

 may have important influence on the stimulation of offsets in 

 certain species; but this and similar treatments are yet too 

 little understood to warrant including them in a manual of 

 standard practices. 



