The Garden Under Glass

GLOSSARY 357 Leaf Cuttings.—With plants of the Gesneraceæ order propagation by means of leaves can readily be effected. The method is explained and shown by illustration on pages 76 and 210. Lead.—This word is used chiefly in connection with orchids, and means the growth springing from the plant to eventually become a pseudo bulb. A better idea may be gained by refer-ring to Diagram 45, page 219, where on the right of the plant in Figure 3 a young lead is seen. Leading Growth.—The main or central growth of a plant. Lean-to.—A greenhouse having but one span and leaning against a high wall is called a lean-to house. An illustration of the sectional plan of a lean-to structure will be found on page 13, Figure 2. A lean-to structure should usually face the south, so as to command plenty of light and sunshine. A lean-to facing north is very useful in an establishment where there are several other glass-houses, but cannot be recommended as a general utility greenhouse. Leggy.—A plant is said to be leggy when it has become long, thin and attenuated instead of being dwarf and sturdy. Legginess is promoted by excessive heat, excessive shade, want of air and a crowded condition. The remedy for all these conditions is obvious. Lifting.—When a young fruit-tree—notably a peach-tree— becomes luxuriant in growth, it is a good plan to take it out of the ground in the autumn and plant it afresh. This will check the exuberance and help it to become prolific. Some-times thick fibreless roots will be found. These must be cut hard back to promote the production of fibrous feeding roots. With quite young trees the mere act of lifting them will sufficiently check the exuberance. 1 he lifting may be done at any time after the leaves have fallen, but preferably before the end of November. Linings.—A lining is put to a frame for the purpose of keeping the heat therein. In those days when the use of hot-water heating was not very general, heat was obtained by means