[Overview]
An annual or perennial.
The leaves are simple, alternate or opposite, ovate with a pointed tip, and the leaf margins are entire.
The flowers are borne singly in the leaf axils or in involucrate inflorescences, and are blue, purple, white and so on.
The corolla is 5-lobed, the corolla tube is long and slender, and there are 4 stamens.
The fruit is a capsule.
[Cultivation]
Propagate from seed.
It prefers well-drained soil and is grown in a sunny place, but in midsummer it should be moved to partial shade.
Water thoroughly when the soil surface dries.
Apply slow-release fertilizer placed on the soil.
There are no particular pests or diseases.
