CULTURAL DIRECTIONS 323 



be deep enough to receive the plants so the tops will not 

 protrude more than about 2 inches above ground. 

 Trenching in most sections may begin any time after the 

 middle of October. When the tops are perfectly dry, the 

 plants are lifted. with some soil and set close together 

 in the trench. The boards which have been used for 

 blanching are nailed together in V form and placed over 

 the trenched plants. If the weather is warm after 

 trenching, blocks or stones should be placed under 

 the edges of the boards to admit air. When the nights 



FIG. 8O. CELERY STORAGE HOUSE 



become cold and there is some freezing, a light furrow 

 of soil is thrown along the base of the boards. Later 

 the boards are covered with manure, increasing the depth 

 as necessary. Trenching is most generally used when 

 the crop is to be sold rather early in the winter. 



Temporary and permanent pits are often used when 

 the crop is stored and managed as explained for hotbeds 

 and cold frames. 



Many growers have especially constructed houses. 

 Figure 80 shows a house in Wayne County, Pa. The de- 

 scription which follows has been furnished by the owner. 



