HERBACEOUS CLIMBERS 37 



if the Tropaeolum makes little growth the first season. 

 If it appear the second year, and is well attended to 

 in the way of water supply, it will grow more vigor- 

 ously, although one can hardly be sure of having 

 established it until it has reached a height of six or 

 seven feet in the second season. It must also have 

 twine or rough twigs to cling to. T. tuberosum is 

 only half-hardy and the tubers ought to be treated 

 like potatoes, planted out in April, and lifted when 

 the foliage becomes yellow, and stored in a frost-proof 

 place in winter. 



