For the process of division, I use a transplant spade. In late spring, I take v-shaped wedges from the outer edges of the clump and replant these throughout the border. Spring growing conditions allow the newly-divided plants to establish firmly. Most asters need at least six hours of full sun. Too much shade results in weak stems that require staking.
Divide asters regularly to ensure they remain healthy and floriferous.
The flowers thrive until late October. Plant 'Snowbank' amongst dark-leaved shrubs where its airy, but neat growth habit and bright white flowers will be most effective. The first flowers open in mid-August and the plants continue to put on an outstanding display well into October. Where other plants jerk to and fro, grasses flutter and dance. There are upright, clump-forming plants, all with showy plumes that are a delight in the summer and fall garden.