FROST EFFECTS 115 



TIMES FOR PLANTING CERTAIN VEGETABLES IN VALLEY AND FOOTHILL 

 REGIONS OF CENTRAL AND NORTHERN CALIFORNIA. 



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* * * * 



Beans ' 



Beets 



Cabbage 



Carrots 



Cauliflower 



Celery 



Corn 



Cucumbers 



Eggplant 



Lettuce ; * * * * * * * * * * * * 



Melons * * * * 



Onions . . . . * * * * * * 



Peas * * * * * * * * * 



Potatoes * * * * * * * * 



Potatoes, sweet 



Radishes * * * * * * * * * * * * 



Salsify * . . ; t '_ .- * * * . . 



Spinach * * * 



Squash * * * * 



Tomatoes * * * 



Turnips * * .. * * * * * * * * 



THE FROST FACTOR. 



The intrusion of the frost period is a local limitation of the 

 planting season. Each vegetable grower should keep records of 

 frost occurrence for his own guidance in future operations and for 

 the public benefit, for the government weather service is very 

 anxious to get local observations on this point. 



During the last decade the San Francisco office of the United 

 States Weather Bureau has given particular attention to frost 

 phenomena, including conditions of occurrence and prevention, and 

 the publications by the local officer in charge, Prof. Alexander G. 

 McAdie, comprise the best knowledge on the subject. 



The discussion in the chapter on California Climate as Related 

 to Vegetable Growing shows that weather conditions are every- 

 where dependent to a degree on local topography and environment, 

 even though there are regional characters which must be under- 

 stood. In this place it is fitting to emphasize especially the dates 

 at which killing frosts have occurred in a large number of localities, 

 because such dates are seldom accurately remembered even in the 



4 On irrigated or naturally moist low land. 



