A GENERAL SURVEY 3 



Their chief use is for starting plants in early 

 spring. 



Coldframes. These are similar to hotbeds 

 but are seldom heated and may therefore be 

 of more shallow construction, as no pit is 

 needed to store the manure. Their chief use 

 is for the growing and protection of young 

 plants after they have been started in hot- 

 beds or forcing houses, or for the growing 

 of plants in late spring after danger of severe 

 weather has passed. 



Coldpits. These are deep pits chiefly used 

 for the storing of bulbs and semi-hardy 

 plants during the winter. They are usually 

 provided with sash roofs the same as hot- 

 beds and coldframes, so that light may be ad- 

 mitted when desired. 



CLASSES OF GREENHOUSES 

 Forcing Houses. These are greenhouses 

 used for^growing or "forcing" plants at other 

 times than at their natural seasons. Prac- 

 tically all houses used by commercial florists 

 and vegetable growers are forcing houses. 

 Conservatories. In this class of green- 

 houses, plants are kept mostly for display. 

 Often it is not desired that the plants so kept 



