DELPHINIUM — DEWBERRY. 22$ 



Delphinium (Larkspur). Raminciilacccc. 



Seeds may be sown outdoors in a warm border in 

 spring, or in pans, to be placed either in frames or outside. 

 The old plants of perennial sorts may be cut down after 

 flowering, when young growths will spring from the 

 base, and the whole may be lifted and carefully divided. 

 Cuttings of the young shoots, taken in autunm or spring, 

 will root freely if potted singly and placed in a coldfranie. 

 They will flower the following season at the same time 

 as the di\'isions. 



Dendrobium. Orchidacecr. 



Where a rapid increase of a new or special variety is 

 recjuired, the pseudo-bulbs that are more than one year 

 old should be cut into lengths, and fastened on orchid 

 rafts, with a layer of sphagnum beneath them. Suspend 

 them in a hot, moist house, if possible, over a water- 

 tank. The advantage of this method is that the young 

 |)lants do not need shifting after they commence rooting 

 on their own account. The section to which IJ. nggre- 

 gatum^ D. Jenkinsii, D. deiisiJJormn and D. /hrysiflornin 

 belong are best propagated by division. (See under 

 Orchids.) 



Dentaria (Toothwort). Cruiifera;. 

 Propagated by seeds or divisions. 



Deodar. See Cedrus. 



Deutzia. Saxifi-agaceix. 



Commercially, the species are mostly propagated by 

 green hardened cuttings in sunmier, under a frame. 

 Hard-wooded cuttings may be taken in autumn, and be 

 treated in about the same manner as currant cuttings (see 

 pages 67, 68). The deutzias are also pro|iagated by divi- 

 sions and layers. Some of the dwarf sorts are sometimes 

 forced, to make cuttings for winter use. 



Dewberry {Rubus Canadensis and vars., Rubus vitif alius 

 and Rubus trivialis). Rosacea. 

 .Seeds are handled in the same manner as blackberry 

 seeds. Increased bv layers and, like the blackberry, by 

 root cuttings. Layers are made by simply covering the 

 decumbent canes at the joints. This is the usual method 

 of multiplication. The tips, too, root freely, as in the black- 

 cap raspberries, and it is from these that the ccjmmer- 

 cial dewberry plants are mostly grown. See Blackberry. 



