10 GREENHOUSE MANAGEMENT. 



warm the houses, and the amount should be gradually 

 increased, so that during the warmest and brightest part 

 of the day it will be ten or fifteen degrees higher than 

 at night. When the temperature is allowed to run up 

 ten or fifteen degrees before the air is let on, and then 

 the ventilators are opened wide, it will be almost sure to 

 bring on mildew. Plants grown with a judiciously reg- 

 ulated supply of air will be in a much healthier condi- 

 tion than those grown where extremes prevail. 



LIQUID MANURES AND FERTILIZERS. 



After the roses have started into growth, it will be 

 well to give them an application of liquid manure once 

 in two weeks. It will generally be advisable to pinch 

 off the first flower buds that form, that the plants may 

 throw all of their vigor into the development of stems 

 and leaves. 



From the first benches planted, cutting can begin 

 in July, and as soon as the crop is off the bed should 

 receive an application of ground bone, at the rate of one 

 pound to twenty-five square feet. This should be 

 slightly worked into the soil, and the bed covered with 

 manure. A half inch of sheep manure will be prefera- 

 ble, but if this cannot be obtained three-fourths of an 

 inch of cow manure will answer. Unless mineral ma- 

 nures are relied upon, the application should be repeated 

 once in two months. During the dull weather from 

 November to January, the mulching should be thin, but 

 by February the amount used may be slightly increased. 



It is believed by many growers that the diseases 

 like "black spot," and mildew, and the other troubles, 

 such as blind shoots, and imperfect flowers, may be at- 

 tributed, at least in part, to the stimulating effects of 

 stable manure. While they are not caused directly by 

 its use, there can be no doubt but that the large quan- 

 tity of sheep and cow manure used by many florists 



