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Where the expence of blanching-pots is objected to, the beds must be covered with a large portion of loose gravel and mats; but the saving is trifling, when the time and trouble of removing and replacing the gravel, for the cutting of the crop and securing the plant, are considered.
The temperature under the blanching-pots should constantly be kept as near fifty-five degrees of Fahrenheit's scale as possible, and on no account higher than sixty at any time.
It is likewise necessary to cut the leaves off a fortnight or three weeks before they decay, in those plants which are intended to be forced at a very early period. It is also suggested that the blanching-pots used in forcing should be made in two pieces, the uppermost of which should fit like a cap upon the lower; as the crop might then be examined at all times without disturbing the hot dung.
The blanching-pots for this use are somewhat of the same shape and size as the large bell-glasses commonly employed in market gardens for raising tender vegetable crops, but made of the same materials as the common earthenware, having a handle at the top. They may be about a foot and a half in diameter at the rim where they apply to the ground. Forcing sea-kale.
Then each circle of plants is to be covered with one of the blanching-pots already alluded to, pressing it firmly into the ground, so as to exclude all light and air, as the colour and flavour of the shoots are greatly injured by exposure to either of them.
It should invariably be well pressed down between the blanching-pots, heat-sticks being placed at proper intervals, by the occasional examination of which the heat below will be readily shewn.
When the beds are twenty-six feet long, and four wide, they will hold twenty-four blanching-pots, with three plants under each, making seventy-two plants in a bed. They are to be examined from time to time, the young stems being cut, when about three inches above the ground, care being taken not to injure any of the remaining buds below, some of which will immediately begin to swell.