SASH-BED CONSTRUCTION 29 



FORCING BOXES 



Forcing boxes or plant forcers are small 

 coldframes with a single pane of glass, 

 which are used to place over individual plants 

 started early in the spring. They are used 



Fig. 14. Types of forcing boxes or plant forcers 



for protecting tomatoes, eggplants, melons 

 and other heat-loving plants, and are re- 

 moved as soon as continuous hot weather 

 arrives. They are used also for forcing rhu- 

 barb, asparagus 'and other vegetables in early 

 spring, and for perennial flowering plants. 



Fig. 15. Forcing boxes in use on a commercial scale 



