Champagne Brunch Dahlia is a fresh and bright mix of colours for the mixed border or larger containers. These ones can reach 100cm (40") tall, with large, 10cm (4") wide flowers, so they need a good anchor in the soil. Grow in full sun for best results. Dahlias bloom from mid- to late summer. Dahlias are not winter hardy, so make sure to lift the tubers in the fall and store them in a frost-free location over winter.