Formerly Aster laevis, the Smooth blue aster which has large lavender/blue flowers in late summer. usually found growing in rocky, sandy habitats.
The nectar and pollen of the flower heads attract various bee species, wasps, butterflies and other insects.
One of my favourite and luckily that I found few seeds ready; it is not easy to collect ‘good’ seeds, like in the case of many other Compositae, so not too many…
Germination: warm germinator.