In February or March greenhouse plants should be looked over, and repotted where necessary; those that are too tall should be cut in, and cuttings made of their shoots. The young plants raised from cuttings made in autumn should be repotted in larger pots for flowering; and where the plants do not require fresh potting, but have the surface of their mould become green and mossy, the moss should be taken off, and the ground slightly stirred with a flat stick, taking care, however, not to go so deep as to injure the roots. When trouble is not an object, all greenhouse plants are the better for repotting once a year, either in spring or autumn; and when the ball is taken out of the pot for this purpose, it should be carefully examined, and all the decayed parts of the roots should be cut off. Sometimes, when the ball of earth is turned out, nearly half of it will fall off almost without touching it; and when this is the case, it will generally be found that there is a worm in the pot. Worms do a great deal of mischief to greenhouse plants in cutting through the roots, as their instinct teaches them to make their way through the earth straight across the pot and back again, and they cannot do this without tearing the roots asunder every time they pass.
Another point to be attended to in the management of a greenhouse is, keeping the plants as near as possible to the glass, as, unless this be done, the plants will become what gardeners call "drawn up," that is, they will be unnaturally tall and slender, from the efforts they make to reach the light.
As I have frequently mentioned _repotting_, I may as well tell you here the best mode of performing the operation. The pot to which the plant is to be removed should always have been previously washed quite clean, and be perfectly dry. Some bits of broken pots, called potsherds, should then be put at the bottom of the pot, the quantity varying from three or four pieces (so as just to cover the hole) to a mass an inch in depth, depending upon the nature of the plant. If the plant has not been in a pot before, the roots are then placed just above the potsherds, and the earth is filled in, the plant being occasionally shaken so as to allow the earth to get amongst its roots. The soil is next consolidated by shaking the pot, and then lifting it up and setting it down again with a jerk; and is rendered firm and neat round the rim by means of a broad smooth piece of stick shaped somewhat like a table-knife, and called a potting-stick. When a plant has been in a pot before, and is repotted or shifted, as it is called, into a pot a size larger, the plant is turned out of its old pot by putting the hand upon the earth and turning the pot upside down; or, if the ball of earth does not come out readily, striking the rim of the pot against the edge of the potting-table or shelf. The ball containing the plant will thus drop out into the left hand; and the potsherds that adhere to the bottom of the ball having been picked off, and any part of the root that appears decayed having been removed, a little mould is put on the drainage in the new pot; and the ball of earth, containing the plant having been placed in the centre, the space between it and the pot is filled in with light rich mould, and made firm with the potting-stick. The operation is concluded by shaking the pot, and then taking hold of the rim with both hands, and striking the bottom of the pot two or three times with a jerk against the potting-bench. The plant is then watered, and set in the shade for the remainder of the day.
