Lysimachia Nummularia (Creeping Jenny).—­This plant is extremely hardy, and is eminently suitable either for rock-work or pots.  It is of the easiest cultivation, and when once established requires merely to be kept in check.  Every little piece of the creeping root will, if taken off, make a fresh plant.

Lythrum.—­Very handsome hardy perennials which thrive in any garden soil, and may be raised from seed or increased by dividing the roots.  They flower in July.  Height, of different varieties, 6 in. to 4 ft.

M

Madia.—­A hardy annual of a rather handsome order.  The seed should be sown in May in a shady situation.  The plant is not particular as to soil, and will flower about eight weeks after it is sown, and continue to bloom during August and September.  Height, 11/2 ft.

Magnolia Grandiflora.—­A handsome, hardy evergreen, with large shining, Laurel-shaped leaves, and highly-scented, Tulip-shaped white flowers.  A noble plant for a spacious frontage, but in most places requires to be grown on a wall.  It flourishes in any damp soil, and is increased by layers.  Flowers in August.  Height, 20 ft.

Mahonia.—­Handsome evergreen shrubs, useful for covert planting or for grouping with others.  They grow best in a compost of sand, peat, and loam, and may be propagated by cuttings or by layers of ripened wood, laid down in autumn.  They flower in April.  Height, 4 ft. to 6 ft.

Maianthemum Bifolium.—­The flowers of this hardy perennial are produced in April and May, and somewhat resemble miniature Lily of the Valley.  Seed may be sown at the end of July.  The plant will grow in any soil, but delights in partial shade.  Height, 6 in.

Maize.—­See “Zea.”

Malope.—­Very beautiful hardy annuals having soft leaves.  They may be raised from seed sown in April in any garden soil.  They bloom in June or July.  Height, 11/2 ft. to 2 ft.

Malva.—­Very ornamental plants, more especially the greenhouse varieties.  The hardy perennials succeed in any good garden soil, and are increased by seed sown in the autumn, or by division of the root.  The greenhouse kinds should be grown in rich earth:  these are propagated by cuttings planted in light soil.  The annuals are poor plants.  Some of the varieties bloom in June, others in August.  Height, 2 ft.

Mandevillea Suaveolens.—­A fine climbing plant bearing very sweet white flowers in June.  It is rather tender, and more suitable for the conservatory than the open air.  It does not make a good pot-plant, but finds a suitable home in the border of the conservatory in equal parts of peat and sandy loam.  In pruning adopt the same method as for the vine or other plants which bear flowers on wood of the same year’s growth.  It is propagated by seed sown in heat, or by cuttings under glass.  Syringe the leaves daily during the hot season.  A temperature of from 40 to 50 degrees in winter, and from 55 to 65 degrees in summer should be maintained.  Height, 10 ft.