Soak the seed for 24 hours in tepid water before sowing. Plants will flower the year after planting. Basal cuttings can be taken mid- to late spring to propagate fine cultivars. However, if one is interested in new forms just let the seed germinate, and transplant the seedlings to a holding bed where they can flower so one can select the finest forms. Plants are spreading in habit and reach only 25 to 35 cm in height.
Flowers are deep blue to blue-purple and are borne in crowded racemes in the summer.
Planted in a sunny site on moderately fertile soil, this little annual has always done extremely well in my garden.