Easily grown, they prefer sun in a well-drained soil, preferably
enriched with compost.
Keep moist at all times and fertilize.
Shelter from strong winds and stake the taller species. Cut the long
stems down to ground level and tidy the clumps when the flowers have
There are two colors,white and light blue.
Propagate by seed. Powdery mildew, rust, aphids and snails can be a