Sept.] GREEN-IIOUSE AND CONSERVATORY. 1069 



SEPTEMBER. 



VENTILATION. 



The evenings will now, particularly towards the end of the 

 month, be beginning to become chilly and cold, ventilation 

 must therefore be attended to, although during the day the 

 plants should be as much exposed as possible ; yet, during the 

 night, particularly in wet weather, they must be shut up, at 

 least all the roof-sashes must be closed. If the green-house 

 be kept too much shut up at this time, many of the plants will, 

 if not totally die, at least experience a very great check, and 

 in consequence lose many of their leaves, and some of the 

 more succulent or luxuriant shoots will damp off altogether. 

 As they were gradually exposed to the action of air and sun- 

 shine in spring, so must they be gradually weaned from it at 

 this season. In mild weather during the night, the ventilators, 

 if any, should be kept open ; and where there are not these 

 conveniencies, the front or end sashes should be left partially 

 open, so as to admit a pure current of air without admitting 

 rain, which would be the case, were the roof-sashes to be 

 opened. 



The same rules are to be applied, in a certain extent, to the 

 conservatory also ; as the plants have, during the summer, been 

 fully exposed to the air, they should now also be gradually 

 accustomed to a less degree, accordingly as the cold weather 

 approaches. It is only on very mild nights that much air can 

 be admitted after this time ; but during every day, until towards 

 the end of the month at least, it should be admitted freely. 



WATERING. 



Plants in pots will for the most part require less water now 

 than formerly ; and those which are denominated succulents, 

 may, with few exceptions, be considered as sufficiently sup- 

 plied from the atmosphere. The plants in the conservatory 

 should also have it in less quantity, as getting the borders into 



