3IO THE NURSERY LIST. 



cellar. The next spring they are planted out in beds, 

 and during the following summer and winter they are 

 given some protection from sun and cold. Yeus and 

 arbor-vittes are handled in the same way. 



Retinosporas are often grafted upon retinospora or com- 

 mon arbor vita; stocks. This operation is usually per- 

 formed upon potted plants in winter by the veneer method. 



Rhamnus, including Frangula (Buckthorn'. A'/iaiimarCcr. 

 The hardy kinds may be increased by means of seeds 

 or b_\- layers The stove and greenhouse species may be 

 multiplied by cuttings of growing parts. Seeds should 

 be stratified. 



Rheum (Rhubarb, Pie-plant, Wine-plant). Polyg:onacea:. 

 Increased by seeds and by division. Each division 

 should contain at least one bud on the crown. Seeds 

 may l)e sown where the plants are to stand, but will not 

 reproduce the varieties, and three years are required for 

 the jjlants to mature. 



Rhipsalis, including Lepisniium, Pfeiflera. Cactacca:. 



Cuttings, after having l:ieen dried lor a few days, should 

 be inserted in ciarse gr;uel or sand. See Cactus. 



Rhodanthe. See Hclipleruni. 



Rhododendron, Azalea (Rose-Bay). EritacecT. 



.Seeds are largely employed, but they are small and 

 light, and must be carefully hand'ed. They are sown in 

 spring in pans or boxes in a soil oi sandy peat, care being 

 t<iken to cover them ver\- lightly and not to dislodge them 

 when applying water. They are handled in coldframes 

 or in a c loi hi luse, and the young plants must be shaded. 

 The plants are C' immonly allowed to remain a year in the 

 tjo.xes. Liixv-growing plants are often layered. Cuttings 

 of growing w.Hjd, cut to a heel, are sometimes employed, 

 being made \n summer and handled in a frame, but the 

 jiercentage of rooted plants will often be small. Rhodo- 

 dendrons are extensively grafted, the \eneer method be- 

 ing most used. The operation is performed upon potted 

 plants in late summer or early fall, or sometimes in a cool 

 house in early spring. Most of the leaves are alh;uved to 

 remain u|ion the cion. The plants are then pliced in 

 densely shaded cool frames { Fig. 47), and are nearly cov- 

 ered with sphagnum. \'arious stocks are employed, but 

 for severe climates the hardy species, like R. Catawbieii'.e 



