Back in spring 2021.  1 litre sized pot.  Herbaceous, hardy perennial.  Aster lateriflorus var. Horizontalis has small white flowers with pink centres held on stems that shoot out horizontally with dark green foliage.  Likes full sun to part shade, well-drained soil.  Reaches 60-70 cm.  Flowers in late summer/autumn.  Loved by bees and beneficial insects.