the hardy kinds, but they prefer shade and moisture. These may be
increased by seed or division. The greenhouse varieties thrive best in
a mixture of loam and peat. Young cuttings placed in sand under glass
will strike. July is their flowering season. Height, 1-1/2 ft. to 2
ft.
I
Iberis.--See "Candytuft."
Ice Plants.--See "Mesembryanthemum."
Ilex.--See "Holly."
Impatiens Sultani.--Half-hardy perennials. May be raised from seed
sown early in spring on a hotbed, or later on in a shady spot in the
open border; greenhouse culture, however, is more suitable. They bloom
in 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.