Mertensia.--These hardy perennials flower from March to July. They will grow in any garden soil, but do best in peat, and are propagated by division. They make fine border plants. Mertensia Maritima and M. Parviflora, however, are best grown in pots, in very sandy soil, perfection being afforded them during the winter. Height, 11/2 ft. to 2 ft. Mesembryanthemums (_Ice Plants_).--These half-hardy, annual succulents have a bright green foliage covered with ice-like globules. They must be raised in a greenhouse or on a hotbed, sowing the seed in April on sandy soil. Prick the young plants out in May. If grown in pots they thrive best in a light, sandy loam. In the border they should occupy a hot and dry situation. Keep the plants well watered until established, afterwards give a little liquid manure. May be increased by cuttings taken in autumn. Cuttings of the more succulent kinds should be allowed to dry a little after planting before giving them water. A dry pit or frame is sufficient protection in the winter; they merely require to be kept from frost. Flower in July. Height, 1 ft. Mespilus.--_For treatment, see_ "Medlars." Meum Athamanticum.--A hardy perennial with graceful, feathery green foliage, but of no special beauty. It is a native of our shores, will grow in any soil, blooms in July or August, and is freely propagated by seeds. Height, 1-1/2 ft. Michaelmas Daisies (_Starworts_).--A numerous family of hardy herbaceous perennials. Some few are very pretty, while others can only be ranked with wild flowers. They thrive in any soil or position, but flourish best where there is a due proportion of sunshine. They are easily raised from seed, sown early in spring, or may be increased by root-division either in the autumn, as soon as they have done flowering, or in the spring. They vary in height from 1 ft. to 5 ft. Michauxia Campanuloides.--This is an attractive border biennial, bearing from March to June white campanula-like flowers tinged with purple, on erect stems. It is not particular as to soil, but requires a southern position and protection in winter. Propagated by seeds in the same way as other biennials. Height, 4 ft.