286 THE NURSERY-MANUAL 



Codiaeum (Croton of gardeners). Euphorbiacece. 



New varieties are produced by seed, started in heat. Cut- 

 tings of half-ripened wood taken in winter or spring make good 

 plants if struck in a bottom heat of 80. Large branches may be 

 mossed (air-layered) and made thereby into separate plants ; this 

 treatment is often also employed with old tall plants : an incision 

 is made in the stem beneath the crown of leaves and moss is 

 tied about the plant, and in about three weeks it should be ready 

 to be severed and potted. 



Coelogyne. Orchidaceoe. 



Propagated by division and by taking off the back bulbs. See 

 Orchids, page 372. 



Coffea (Coffee). Rubiaceos. 



Under glass as an ornamental or " economic " plant, coffee may 

 be grown from ripe cuttings. 



As a crop in the tropics, coffee is raised from seeds. Sometimes 

 volunteer seedlings in old plantations are used, but it is best to 

 plant the seeds, after the pulp is removed, in carefully prepared 

 shaded seed-beds, well protected from heavy rains. In ten to twelve 

 weeks, the plants should be ready to transplant to nursery rows, 

 the first foliage leaves having appeared. The tap-roots are cut 

 back. After about five pairs of true leaves are developed, the 

 plants may be set in the field ; they should bear in three or four 

 years. 



Coix (Job's Tears). Graminece. 



Grown from seeds, sometimes started indoors with heat. 



Colchicum (Autumn Crocus). Liliaceae. 



Increased by seeds, as soon as ripe, June to July ; also propagated 

 by separation just after the leaves die, end of June or early July. 



Coleus. Labiatoe. 



Multiplied by seeds (which grow readily) for new varieties ; also 

 by cuttings of soft growing shoots with the greatest ease at any 

 season. Fig. 117. 



Collards (Brassica oleracea var. acephala). Cruciferas. 



Grown from seeds, in the South started in February and March 

 so that growth may be made before hot weather, in the North in 

 July or August so that the growth may be made before winter. 



