CUT FLOWERS UNDER GLASS 09 



WHEN AUTUMN COMES 



The most critical time of all is as we ap- 

 proach autumn, September and October. 

 Changes in the atmosphere are then sudden 

 and of great degree. The rose grower who 

 has his house so piped that he can turn on a 

 little only a little heat even during Sep- 

 tember is often very glad of his foresight. 

 Sometimes for this purpose a single pipe is 

 carried overhead in the ridge, or one on each 

 side of the house near the eaves. The night 

 temperature at that time should not drop 

 below 60 degrees; it will be better to keep 

 it at 65 degrees. The cold nights are very 

 treacherous to the rose grower and he must 

 be prepared. As the weather gets colder 

 the fire heat is gradually increased so as to 

 maintain 56 to 58 degrees at night for Teas, 

 and 58 to 62 degrees for Hybrid Teas, except 

 Meteor, which requires 10 degrees higher 

 both day and night. In the ordinary rose 

 house a day temperature of 65 degrees is 

 to be kept up. When the thermometer in- 

 side shows one degree above the temperature 

 outside open the ventilators on the side away 

 from the wind and at the top one inch and 



