Photo showing an allotment flower garden growing group of flowering dahlias in various colours, such as yellow, orange, red, pink and white. These dahlias contrast with the surrounding vegetables and are being grown as a crop of cut flowers, for floral arrangements. The different types of dahlia picture include decorative, single flowered, cactus (spiky), anemone flowered, peony flowered, ball (pompon) and collarette.