270 BULBS AND TUBEROUS-ROOTED PLANTS. 



After flowering, a season of complete rest is essential. 

 This is best afforded by turning the pots on their sides 

 in some shaded place, where water cannot reach. This 

 is as near as we can approach a natural rest. With this 

 rest the plants will make less leaves, and far more flow- 

 ers, which is the object to be gained. 



The plants may be re-potted, if necessary, about the 

 first of October, giving them a pot one size larger than 

 they previously occupied. The offsets may be potted 

 separately, in two-inch pots, which are sufficiently large. 

 If the plants are not over-crowded in the pots a change 

 will not be necessary. Set the pots in a tub of water 

 until the ball is thoroughly wet, then grow on as before 

 stated. For the window garden there is no more satis- 

 factory plant than the Calla ; it will endure more heat 

 than most others, and there is no danger from over- 

 watering. An occasional syringing and washing of the 

 leaves with a soft sponge, to keep them free from dust, 

 is of great importance. What are popularly known as 

 Crimson or Black Callas, are species of Arum, described 

 on Page 33. The true species are : 



R. sethiopica (Syn. R. africana). — Described 

 above. 



R. albo-maculata. — A species with spotted foliage, 

 and smaller white flowers, with purple center, produced 

 freely in summer. It makes a fine clump in the border. 

 The tubers of this species can be kept dry during winter, 

 the same as Dahlias (Page 84), and divided in spring 

 when planted out. This species grows readily from seed 

 sown in the garden at the same time the bulbs are 

 planted ; flowering the second year. 



R. hastata (Yellow Calla). — The flowers of this 

 species are similar in all respects to those of R. cethiojnca, 

 excepting that they are of a greenish yellow color. 

 The plants are to be treated in the same manner. 



