Leptospermum.—­Neat greenhouse evergreen shrubs, most at home in equal portions of loam, peat, and sand.  Cuttings may be struck in sand under glass.  They flower in June.  Height, 4 ft. to 5 ft.

Leschenaultia.—­Elegant greenhouse shrubs, delighting in a mixture of turfy loam, peat, and sand.  They are evergreen, flower in June, and are propagated by cuttings of the young wood under glass.  Height, 1 ft.

Lettuce.—­Sow early in February on a slight hotbed, and prick out into a well-manured and warm border, having the soil broken down fine on the surface.  For early summer supplies sow outdoors in March, and at intervals till the middle of September for later crops.  Some of the plants raised in September should be wintered in a cold frame, and the remainder transplanted to a dry, sheltered border, or protected with hand-lights.  The June and July sowings may be made where the plants are intended to remain.  They should stand from 6 to 9 in. apart.  A north border is a suitable position in the summer months, as they are less exposed to the sun, and do not run to seed so quickly.  The Cos Lettuce requires to be tied up to blanch; this should be done ten days before it is wanted for use.  Cabbage Lettuce does not need to be tied.

Leucanthemum (Hardy Marguerites).—­Same treatment as Chrysanthemum.

Leucojum (Snowflake).—­Also known as St. Agnes’ Flower.  Handsome plants.  The flowers are pure white, every petal being tipped with green, dropping in a cluster of from six to eight blooms, each nearly 1 in. long.  They grow freely in almost any soil, sandy loam being preferable.  Increased by off-sets from the bulb, or by seed as soon as it is ripe.  The spring snowflake blooms in March, the summer variety in June.  The latter is a much more vigorous plant than the former.  Height, 12 in. to 18 in.

Leucophyton Browni.—­A popular white-foliaged bedding plant, which may be increased by dibbling cuttings in sandy soil and placing them in a cool frame.

Lewisia Rediviva.—­This makes a pretty rock-plant.  It is a perennial and quite hardy, but requires plenty of sun.  During April and May it produces large flowers varying in colour from satiny rose to white.  The most suitable soil is a light loam mixed with brick rubbish.  It is increased by division of the root, or it may be raised from seed.  Height, 3 in.

Leycesteria Formosa.—­Ornamental plants, the flowers resembling Hops of a purple colour.  They will grow in any soil, but need protection in winter.  They are multiplied by cuttings.  Height, 3 ft.

Liatris Pycnostachya.—­A curious old herbaceous perennial, now seldom met with, sending up late in summer a dense cylindrical purple spike 2 ft. high.  It needs a rich, light, sandy soil, and to be protected during the winter with a thick covering of litter.  The roots may be divided in the spring.  Height, 3 ft.

Libertia Formosa.—­The narrow foliage and spikes of pure white flowers, produced in May and June, render this hardy perennial very ornamental.  The soil should consist of equal parts of loam and peat.  It is propagated by dividing the roots.  Height, 1 ft.