96 GARDENING FOR PLEASURE. 



high) should be one foo teach way, so as to get the full 

 benefit tff a crop by January. It is true that, if planted 

 twice that distance, they would be thick enough before 

 bearing ; but they will not II up sufficiently until the 

 middle of January, if planted much wider than one foot, 

 and it is always before that date that Roses are highest in 

 price. The temperature at which Roses are grown in 

 winter is an average of fifty-five degrees at night, with 

 ten to fifteen degrees higher during the day. Conse- 

 quently, if heated by hot water, in this latitude, a house 

 twenty feet wide will require eight runs of four-inch pipe 

 to maintain that heat ; if sixteen feet wide, about six 

 runs ; and if twelve feet wide, about four runs. If heated 

 by steam, a one-and-a-half-inch pipe will be about equal 

 to a four-inch hot-water pipe. 



VENTILATION 



is an important matter. In a Rose house twenty feet 

 wide, sufficient ventilation will be obtained by having 

 lifting sashes, to the width of thirty inches, placed along 

 the whole of the roof on the south side, hinging them so 

 that they will open at the ridge pole. For this purpose 

 the patent ventilating apparatus should be used, which 

 costs from sixty to seventy cents per running foot. 



WATERING AND MULCHING. 



Watering is a matter of the first importance, and re- 

 quires some experience to know what is the proper con- 

 dition. It is not often that Roses require to be watered. 

 The heavy syringing necessary each forenoon in clear 

 weather to keep down red spider is generally sufficient to 

 keep them in the proper condition of moisture ; of course, 

 good judgment must be used to syringe heavier in warm, 

 bright weather, when the plants are in vigorous growth, 

 than in dull weather, or when the plants are not so vigor- 



