44 THE PRINCIPLES OF FLORICULTURE 



day, and houses are located on quite exposed areas, pro- 

 vided that other important factors warrant the selection 

 of such a site. Good air drainage about the houses purifies 

 the atmosphere and renders plants less susceptible to 

 disease. If there be a grove of evergreen trees a little dis- 

 tance from the range on the north or northwest, the driving 

 force of the wind is lessened and its suction force over the 

 ridge of the houses is reduced, and there is less breakage 

 of glass. 



40. Climatic conditions. One factor which is fre- 

 quently overlooked in deciding on a location is the fact 

 that in certain localities there are a large number of 

 cloudy or " gray " days. The flower-grower watches the 

 sunshine closely, for he realizes the benefit which comes 

 to his pocket-book through an abundance of bright, clear 

 days, especially in midwinter. In many sections, frequent 

 fogs are prevalent, especially during the morning when 

 light factors are important. In certain sections of the 

 United States, it is impossible to grow American Beauty 

 roses satisfactorily because of an abundance of cloudy 

 weather. Growth is not satisfactory, and the rich coloring 

 of blooms is defective. In other sections, where the at- 

 mosphere is " rare " and clear, they develop to perfection. 

 Thus this branch of the industry has become localized. 



Low outside temperatures are not the all-important 

 factors in flower-growing under glass. By sufficient piping 

 and careful regulation, cut-flowers may be grown just 

 as satisfactorily in Canada and northern United States, 

 and without a greatly increased coal consumption, as 

 they can farther south. The period when high tempera- 

 tures must be maintained may be somewhat longer and the 

 cost of production therefore somewhat increased. How- 

 ever, in the larger ranges, especially where roses are 



