260 THE NURSERY-MANUAL 



Brussels Sprouts (Brassica oleracea var. gemmifera). Cruciferce. 



Propagated by seeds, sown in the open where the plants are to 

 stand, but usually in a coldframe or separate seed-bed and plants 

 transplanted to permanent quarters. They are hardy plants, 

 and seeds may be sown early if desirable. 



Bryonia (Bryony). Cucurbitaceos. 



Multiplied by seeds, and by divisions of the tuber. Cuttings 

 of the shoots will also strike (but with difficulty) in water. 



Bryophyllum. Crassulaccce. 



Propagated by stem-cuttings rooted in sand ; or by simply laying 

 the leaf on moist sand or moss, and at the indentations on the mar- 

 gin plantlets will appear, and because of this peculiarity the plant 

 is frequently grown for botanical instruction. Fig. 106. Also 

 grown from seeds. 



Buddleia. Loganiaceoe. 



Propagation is by seeds sown in spring in gentle bottom heat; 

 by greenwood cuttings under glass; and by hardwood cuttings 

 taken in fall and kept during winter in a frost-proof room. 



Buffalo-Berry (Shepherdia argentea). Elceagnaceoe. 



Grown readily from seeds, which are cleaned of pulp in fall 

 and stratified till spring. Sometimes transplanted from the wild 

 to nursery rows. Special varieties or strains can be grafted, if 

 desired, on the Russian oleaster (Elaeagnus angustifolia) . 



Bulbocodium. Liliacece. 



Handled by offsets of the bulbs. 



Bulbophyllum. Orchidacece. 



Multiplied by division of pseudobulbs. See Orchids, page 372. 



Bulbs. 



Consult the various genera, as amaryllis, crocus, hyacinth, 

 lily, narcissus, tulip, and others. Most bulbs and corms make 

 naturally separable parts, as offsets, bulbels and cormels ; these 

 may be grown to large size, making blooming plants in two to 

 four years. 



Burlingtonia : Rodriguezia. 



Butomus (Flowering Rush). Butomacece. 



Increased by seeds, and by division of the roots. 



