HERBACEOUS PERENNIAL VINES 87 
Most of the vines included in this group are 
continuous bloomers; that is to say, they do not 
flower in a given season, but prolong their bloom- 
ing until cut down by frosts. Vines of this sort 
should never want for water, as they are con- 
stantly using energy to develop their flowers. 
Some tender tuberous-rooted climbers that are 
perennial in the South have been included, but, 
_except where otherwise stated, all vines are hardy 
and need no protectionin winter. It is advisable, 
in the case of hardy vines which are fibrous- 
rooted, such as the hop, to divide the roots every 
four or five years, as these plants become old and 
make far more annual growth than they can 
support. Such division will give an opportunity 
to re-stock the soil with nourishment, which 
should never be lacking. ‘This can be done in 
spring or fall. The usual method is to lift the 
entire clump, cut it into four equal parts with a 
good, sharp spade, and plant one part in the 
place where the old plant was. Use the other 
three elsewhere or throw them away. 
This class of vines is not to be despised, as 
there are some grand climbers in it. Most of 
them are second only to annual vines in the 
amount of flowers produced. Why it is I do not 
know, but most people usually think of perennial 
