Aster

Probably one of the top ten border plants, this traditional lavender-blue aster offers several advantages over other Michaelmas daisies. It has a longer flowering season, beginning earlier, in mid summer, continuing into autumn. It does not need staking (except in windy gardens), and is mildew resistant. It is also exceptionally free-flowering, with an attractive colour that is easy to place as it associates well with so many summer and autumn flowers. Aster is best grown in a sunny or partially shaded position with fertile, well-drained soil. It requires adequate moisture throughout summer. The Royal Horticultural Society have given it their prestigious Award of Garden Merit.

Looks good with:

Achillea millefolium
Echinacea purpurea 'White Swan'