PRACTICAL PLANT PROPAGATION 



SOWING VEGETABLE SEEDS FOR GREENHOUSE CULTURE 



Fig. 6A. A zone map of the United States, based on the average dates of the latest 

 killing frost in Spring. From Farmer's Bulletin 937. 



seeds. After being washed out of the pulp and dried, the seeds are 

 often stratified or sown immediately in flats, placed in coldframes 

 and subjected to the Winter freezings which will soften and crack 

 their seed coats. Some growers prefer to wait until February before 

 subjecting the seeds to the frost. 



Sand is frequently used instead of soil as the material in which 

 to sow the seeds. When the ground can be worked in the Spring 

 the seeds are sifted from the sand and sown in rows. If planting 



*Dates obtained from H. J. Ruetsnik, Cleveland, 0. 

 tDates obtained from A. G. Smith, Jr., Blacksburg. Va. 

 JDates obtained from "Gardener's and Florists' Annual," 1918. 



