Sky blue flowers with a distinct pink/violet star.
The plant is not very frost hardy, but it can be grown outdoors as a tender annual in temperate zones.
Requires a fertile well-drained loam in a sunny position.
Pre-soak the seed for 12 hours in warm water, or scarify the seed, and sow in individual pots in a greenhouse in early spring. The seed usually germinates in 1 - 3 weeks at 22°c. Plants are extremely resentful of root disturbance, even when they are quite small, and should be potted up almost as soon as they germinate. Grow them on fast in the greenhouse and plant them out into their permanent positions after the last expected frosts. Consider giving them some protection such as a cloche until they are growing away actively.