Early July is ideal for propagating by cuttings, as the plants are growing vigorously at this stage. Watering on a regular basis will produce new plants in about six weeks, at which time I plant them in the border. These new asters will give blooms during their first fall. 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.