Biota.—­See “Thuya.”

Bird Cherry.—­See “Cerasus.”

Blackberries.—­To obtain good crops plant in a poor, dry soil on raised banks facing south.  The bushes should be planted 6 ft. apart.

Bladder Nut.—­See “Staphylea.”

Blanket Flower.—­See “Gaillardia.”

Bleeding Heart.—­See “Dielytra.”

Bocconia Cordata.—­Ornamental hardy perennials.  They do best on a loamy soil, and may be increased by suckers taken from established plants in the summer and placed in rich soil; or by cuttings planted in sand, in a gentle heat under glass; also by seed sown during the autumn months.  They appear to the greatest advantage when grown as solitary plants, away from other tall-growing flowers.  The variety B. Frutescens has an exceedingly pretty foliage.  August is the month in which they flower.  Height, 6 ft.

Bog or Marsh Land.—­By planting a few of the more distinct species adapted for such positions, bogs or marshes may be made interesting.  The following plants are suitable:—­Arundo Donax, Bambusa Fortunei, Cypripedium Spectabile, Dondia Epipactis, Drosera Rotundifolia, Gunnera Scabra, Iris Kaempferi, Iris pseud-Acorus, Juncus Zebrinus, Myosotis Palustris, Osmunda Regalis, Parnassia Palustris, Pinguicula Vulgaris, Polygonum Sieboldi, and Sarracenia Purpurea.

Boltonia Asteroides.—­This is a hardy perennial which flowers in September.  The same treatment that is given to Asters is suitable for this plant.  Height, 3 ft.

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.