Choosing varieties

'Aster' now spans Symphyotrichum (Michaelmas daisies), Aster amellus (Italian asters), and the annual China asters (Callistephus). Pick by season and shape.

Reliable choices: S. 'Little Carlow' (sky-blue, mildew-resistant); A. × frikartii 'Mönch' (lavender-blue, long-flowering, 80 cm); Callistephus 'Matsumoto' mix (annual, brilliant for cutting).