MAY] THE HOT-HOUSE. 419 



the open air. The more tender kinds should not be brought out till 

 the first week in June, but if previously removed into the green- 

 house for a week or ten days it would be the better way; always ob- 

 serving, wherever they are, to give them abundance of air to harden 

 and prepare them for the transition. 



In the eastern States the above work is to be deferred, in every 

 instance, from one to two weeks later, according to climate and the 

 local situation of the place; and to the southward of the middle 

 States it may be done somewhat earlier. 



Should you have no pine-apples in your hot-house, and there are 

 plants permanently growing in any beds or borders therein, the roof- 

 lights should be totally taken off when the other plants are out, that 

 these may receive the full benefit of the open air during the summer 

 months, &c. 



As to the manner of placing and treating the pots when and after 

 being brought out, I would advise the same as recommended for the 

 green-house plants, which see. 



You must be very careful when you plunge any of your pots, to 

 make it a particular point to turn them around in their seats once a 

 week, in order that such roots as run into the ground through the 

 holes in the bottom may be broken off; for though these would, for 

 the moment, encourage the growth of the plants, when you come to 

 take them up for housing, the sudden deprivation of their usual sup- 

 ply of nourishment would give them such a check as seriously to 

 injure them : and, besides, they would be but ill rooted in the pots, 

 and badly prepared to extract the necessary nourishment during 

 winter. 



TREES GROWN IN POTS. 



The injury done to the roots of trees grown in pots, is a subject that 

 the gardener should well consider. By cutting round the roots before 



Fig. 41. 



the removal of a tree (Fig. 41), we may have those rootlets preserved 

 from injury which are too often destroyed : the main roots now radi- 



