VARIOUS FORCING METHODS. 



77 



applied, the dandelions start in about four weeks and 

 are out of the way before the rhubarb needs the room. 

 The rhubarb is allowed to grow until it is well matured 

 and is picked only once, but the single picking is a 

 thorough one. The cron occupies the house from De- 



Hot Wateb Pobcing House (.Interior View). 



comber to March, after which period the glass is taken 

 off and used for other crops. Several other growers 

 use practically the methods just described, some having 

 steam heat in place of hot water, and running a pipe 

 into the rhubarb house from an adjoining greenhouse. 

 Cold Frames. — The common plan for forcing with- 



