FRAME CROPS 



389 



convenient way until wanted again. The commoner 

 method is to use, for the sides, boards which are nailed 

 to stakes, as shown in Fig. 133. Between seasons, the 

 boards may be used for the blanching of celery if desired. 

 Most of the extensive frame growers do not use cross 

 bars for the support of the sash, though they are an ad- 

 vantage in some respects and a disadvantage in others. 

 It is largely a matter of preference. 



There is a marked tendency to use concrete in the con- 

 struction of frames. The walls need not be more than 

 3 inches thick. When banked on the outside with manure, 

 they are practically as serviceable in protecting the 

 plants from cold as are wood side boards. Light T-iron, 



Fig. 133. An extensive flat of coldframes. Note method of ventilation and side- 

 boards nailed to stakes. 



inverted, may be used for cross bars, if these are desired. 

 The durability of this type of frame appeals to growers 

 who have found the frequent renewal of wooden frames 

 an expensive proposition. 



Cloth-covered frames. In North Carolina, South Caro- 

 lina and other southern sections where the climate is not 

 severe, the frame is usually covered with cloth instead of 



