LIST OF PLANTS 135 
about 65 degrees. The hardy annual kinds of Impatiens 
may be sown outdoors in April. Stove and greenhouse 
species, such as I. Sultani, sown in March and grown 
on without check, will make good flowering plants the 
same season. These also propagate very readily from 
cuttings of strong, healthy shoots inserted singly in 
small pots in a propagating-frame at almost any season. 
INCARVILLEA.—The hardy kinds, such as the beautiful 
I. Delavayi, are readily increased by sowing seed in 
gentle heat in March. The crowns of strong plants 
may also be divided in early spring. 
INDIGOFERA.—These include hardy, greenhouse, and 
stove plants. They are propagated by seed sown in 
March and by cuttings of firm young shoots under bell- 
glasses in summer. 
InuLA.—The vigorous, hardy, cultivated species of 
this genus are easily raised from seed sown outdoors in 
March or April, and by division of the roots in October 
or March. 
Ipom#a.—The pretty, half-hardy, climbing sorts grow 
readily from seed sown either indoors or outside, accord- 
ing to their hardiness. The above species, of perennial 
duration, are propagated by cutting's of side-shoots taken 
off with a heel and placed in bottom heat in a close case, 
also by layers. These last are a good means of increas- 
ing the beautiful I. Horsfallie, which does not conform 
to the cuttings system ; it, however, succeeds and grows 
well when whip-grafted on a free-rooting sort such as 
I. insignis, also by root-grafting. 
IRESINE.—Cuttings of these coloured foliage plants 
will root in a close, warm frame at almost any season. 
Old plants or autumn-struck cuttings, kept moderately 
dry in an ordinary greenhouse through the winter, will 
