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. zthiopica (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. wthiopica, 
excepting that they are of a greenish yellow color. 
The plants are to be treated in the same manner. 
