VEGETABLES AND THEIR CULTURE 391 



planting time in the field, a condition which may check their growth and 

 cause them to produce seed shoots instead of marketable stock. On account 

 of the very small size of the seed, there is always likelihood of sowing too 

 thickly. The plants should be thinned if that happens, and in a month or 

 five weeks transplanted one and one-half to two inches apart in flats or beds. 

 In the latter a constant supply of moisture should be maintained until the 

 plants are set in the field. 



Celery Under Irrigation, Skinner System. 



Seed for the late crop should be sown in the spring as soon as the ground 

 can be prepared. 



When boards are to be used for blanching the early crop, it is customary 

 to allow about two feet of space between rows and to space the plants three 

 to five inches apart in the row. In most sections of the North, plants 

 should not be set in the open ground before May 10th. The crop will 

 stand considerable cold, but heavy frosts almost invariably check the growth 



