400 VEGETABLE FORCING 
Fig. 141.—Frame cauliflower ready to head. 
may be grown both as a fall and as a spring crop. See 
Chapter XV for data on the forcing of this crop. 
Celery is grown occasionally as a spring frame crop. 
The plants should be started as explained in Chapter IX 
and transferred to the frames, when there will be no un- 
certainty about the possibilities of maintaining proper 
temperatures. All the notes on celery as a greenhouse 
crop, page 362, apply equally well to its culture in frames. 
It is possible to mature the crop six weeks earlier in 
frames than in the open ground. 
Chinese cabbage may be grown in frames as a spring 
crop with entire success, provided careful attention is 
given to watering, ventilation and the removal of the sash 
when the temperature becomes very high. See page 360 
for additional notes. 
Corn salad, when given careful attention, is a profitable 
frame crop. It is sown in rows about 8 inches apart. 
Tree ventilation and skillful watering are required to 
prevent the ravages of damping-off fungi. 
Cress may be grown in frames in the same manner as 
that explained for greenhouse culture, page 361. 
Cucumber (Fig. 142)—The cucumber is one of our 
