Indulge yourself with boldly colored, large flowers all summer long. The very large, red flowers are flecked with yellow, adding eye-catching appeal to sunny borders and cut floral arrangements. Dahlias are prized for their showy flowers, and this dinnerplate variety is one of the showiest we've found. To keep the blooms coming all summer until frost, remove the spent flower heads. Dahlias prefer well-drained, humus-enriched soil.