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 
