CULTURAL DIRECTIONS 
323 
he 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. 80. 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 and soil 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. 
