Arctotis.--A showy and interesting half-hardy annual. Raise the seed in a frame in March, and transplant in May. It succeeds best in a mixture of loam and peat. It flowers in June. Height, 1 ft. Arctotis Grandis.--A very handsome, half-hardy annual producing large daisy-like flowers on long wiry stems, the upper part being white and the base yellow and lilac, while the reverse of the petals are of a light lilac. The seed should be sown early in spring on a slight hot-bed, and the plants potted off, when sufficiently strong, using a rich, light mould. They may be transferred to the border as soon as all fear of frost is over. Height, 2-1/2 ft. Ardisia Japonica.--An evergreen shrub which delights in a mixture of loam and peat. Cuttings will strike if planted in sand under glass with a little bottom heat. It flowers in July. Height, 6 ft. Arenaria Balearica (_Sand Wort_).--A hardy evergreen trailing plant of easy culture, provided it is favoured with a sandy soil. Its cushions of white flowers are produced in July, and it may be increased by seed or division. Height, 3 in. It is a beautiful plant for moist, shady rock-work. Argemone.--Interesting hardy annuals, succeeding well in any common garden soil. Are increased by suckers or by seed sown in spring. Height, 6 in. to 3 ft. Aristolochia Sipho (_Dutchman's Pipe_).--This hardy, deciduous climber grows best in peat and sandy loam with the addition of a little dung. It may be raised from cuttings placed in sand under glass. Height, 30 ft. Armeria (_Thrift_).--Handsome hardy perennials for rock-work or pots. They require an open, rich, sandy soil. Bloom June to September. Height, 1-1/2 ft. Arnebia.--Ornamental hardy annuals, closely allied to the Anchusa. The seeds are sown in the open in spring, and flowers are produced in July. Height, 2 ft. There is also a dwarf hardy perennial variety (_A. Echioides_) known as the Prophet's Flower, growing about 1 ft. high, and flowering early in summer. It needs no special treatment. Artemisia Annua.--Pretty hardy annuals, the silvery leaves of the plant being very effective on rock-work. Sow the seed in spring where it is to flower. Height, 6 ft. Artemisia Arborea. _See_ "Southernwood." Artemisia Villarsii.--A hardy perennial whose graceful sprays of finely-cut silvery foliage are very useful for mixing with cut flowers. It may be grown from seed on any soil, and the roots bear dividing; flowers from June to August. Height, 2 ft. Artichokes.--The Jerusalem variety will flourish in light sandy soil where few other things will grow. Plant the tubers in March, 6 in. deep and 12 in. apart in rows 3 ft. asunder, and raise and store them in November. The Globe variety is increased by off-sets taken in March. Set them in deeply manured ground in threes, at least 2 ft. apart and 4 ft. from row to row. Keep them well watered, and the ground between them loose. They bear best when two or three years old.