n August. Height, 11/2 ft.

Incarvilleas.--Ornamental hardy herbaceous plants, of easy culture.
They are suitable for the border or the rockery, and will grow in any
soil if not too dry and exposed. The tuberous roots may be planted at
any time in autumn, 4 in. deep. I. Delavayi makes a fine solitary or
lawn plant, its leaves being from 1 to 3 ft. long; the soft rose-pink,
Mimulus-shaped flowers, which are carried on stout stems well above
the foliage, appearing in May. Care should be taken not to disturb it
in spring, and it is advisable to cover the roots in winter with a
pyramid of ashes, which may be carefully removed at the end of April.
Incarvilleas may be propagated by seed sown, as soon as it is ripe,
in light, well-drained soil, giving the young plants protection in a
frame during the first winter, with enough water merely to keep them
moist. Height, 2 ft.

Indian Corn.--_See_ "Zea."

Indian Shot.--_See_ "Canna."

India-rubber Plants.--_See_ "Ficus."

Indigofera.--Beautiful evergreen shrubs. I. Australis has elegant,
fern-like foliage and racemes of pink or purple Pea-shaped flowers in
April. I. Decora Alba bears its white flowers in July. They require a
sandy loam or peat soil, and greenhouse culture. Cuttings of the young
wood planted in sand under glass will strike. Height, 21/2 ft.

Insects on Plants.--To destroy insects on plants wash the plant with
Tobacco-Water (_which see_). Or put 1 oz. of quassia chips in a muslin
bag, pour on some boiling water, and make it up to I gallon; dissolve
1 oz. of soft soap, add it to the chips, and stir well. Use it two or
three times during spring and early summer.

Inula Royleana (_Fleabane_).--A hardy perennial which flowers in
November. It will grow in any garden soil, and can be increased by
seeds, or by division of the roots. Height, 3 ft.

Ionopsidium.--These hardy annuals grow freely in any rich, damp soil;
a shady position is indispensable. Height, 1/8 ft.

Ipomoea.--These beautiful climbing plants are very suitable for
covering trellis-work, or for the pillars or rafters of the
stove-house. The seed is generally sown in April on a hotbed or under
glass, and the young plants set out in the border of the house in May
in light, rich soil. Success is mainly secured by allowing plenty of
root-room. The perennial kinds are increased from cuttings taken from
the small side-shoots placed in sand in a brisk bottom-heat. If grown
in the open they often shed thei