[Overview]
A perennial.
The leaves are simple and opposite.
The flowers are borne in racemes or singly, and are tubular and lipped.
The fruit is a capsule.
[Cultivation]
Propagate from seed.
It is weak against heat and humidity, so it is mainly treated as an annual sown in autumn.
It prefers soil in sun to partial shade that is well drained and retains water well.
Take care that it does not dry out, and water thoroughly when the soil surface begins to dry.
If too much fertilizer is given, only the leaves grow lushly and flowering is poor, so no fertilizer is particularly needed if a base fertilizer is applied.
There are no particular pests or diseases.
