Bomarea.--A useful greenhouse climber, the flowers of which are valuable for cutting, as they last a long time in water. It thrives best in a mixture of sand, peat, and loam.
Borago Laxiflora.--This very choice Boragewort is a trailing hardy biennial. It produces lovely pale pendent flowers from June to August, will grow in almost any soil, and can be increased by seed or division. Height, 1 ft.
Borecole, Kale, or Curled Greens.--Sow towards the end of March or early in April. Plant out as soon as ready in moderately rich soil in rows 3 ft. apart, and the plants 2 ft. apart in the rows. If the seed is sown thickly, the young plants must be pricked off into another bed until ready for planting, as strong, sturdy plants always produce the best results. They may succeed peas without any fresh manure.
Boronias.--Greenhouse evergreen shrubs. A single plant of B. Megastigma is sufficient to perfume a good-sized house. B. Drummondi, Elatior, Heterophylla, and Serrulata are all good plants. The pots should be filled with sandy peat and be well drained. They are propagated by cuttings taken at a joint and placed under glass. May is their flowering month. Height, 2 ft.
Bougainvillea.--A greenhouse evergreen climber, thriving best in a loamy soil. It flowers in June, and may be increased by cuttings. Height, 15 ft.
Bousingaultia Basselloides.--A rapidly growing climber, beautiful both in flower and foliage, the former of which is pure white, produced in July in elegant racemes from 6 in. to 8 in. long. It is nearly hardy; very suitable for a cool greenhouse. Any garden soil suits it. Height, 6 ft.
Bouvardias.--Favourite stove plants. They are propagated by pieces of the thick fleshy roots, about 2 in. long, inserted in light, rich, sandy soil, and plunged in a bottom-heat. Plant out in May in rich, light soil, cutting back all the over-vigorous growth, so as to form a well-balanced plant. At the approach of cold weather they may be taken up and potted off, using small pots to prevent them damping off. In a warm greenhouse they will flower all the winter.
Box Edging.--A deep loam suits the box best. Cuttings should be taken early in autumn. Dig a trench, and make the bottom firm and even. Set the young plants thinly and at regular intervals, leaving the tops 1 in. above the surface. Tread the soil firmly against them. Cover with 1 in. of gravel to prevent them growing too luxuriantly. The end of June is a good time for clipping. May be transplanted early in spring or late in autumn. (_See also_ "Buxus.")