Aster dumosus ‘Wood’s Pink’ (syn. Symphyotrichum) – A compact aster (12 to 18″ tall) that will not require staking, which also features good disease resistance (particularly to powdery mildew). ‘Wood’s Pink’ bears abundant 1/2 to 3/4″ wide light pink semi-double blooms with a contrasting yellow center. It flowers from late August through to October and is hardy to zone 4.
Aster novi-belgii ‘Believer’ (syn. Symphyotrichum ‘Yobeliever’) – The single deep lavender-blue blooms (with yellow centers) really hold up well in the wet fall weather, and are not prone to fading or browning fast. ‘Believer’ is a prolific bloomer with strong stems that make good cut flowers. This is an upright form (24″ or taller, depending on soil fertility), so pinch in June. Zone 4 hardy.
Aster novi-belgii ‘Hazy’ (syn. Symphyotrichum ‘Yohazy’) – Absolutely eye-pooping hot pink single blooms with strap-like petals and a contrasting yellow center. These almost cover the foliage starting in mid-September, and continuing into October. This fairly new introduction (2008) remains compact and dense (12-16″ tall and 16-24″ wide). Zone 4 hardy.
Aster ‘Lavender Mist’ (syn. Symphyotrichum ‘Kiastlavmi’) – Abundant semi-double pale lavender blooms with thin almost fringed petals that open up around a yellow center. This 2011 introduction is self-cleaning and works well in autumn containers. ‘Lavender Mist’ grows 12-16″ tall to 18-24″ wide and is deer resistant. Hardy to zone 4.
Aster dumosus ‘Wood’s Purple’ (syn. Symphyotrichum) – The pale purple to violet-blue semi-double blossoms average a half-inch across and often cover the foliage. This cultivar is quite drought resistant once established and it also attracts butterflies. ‘Wood’s Purple’ blooms from mid-August through to October and grows an average of 12-16″ tall (15-20″ wide). Hardy to zone 4.