Perfect for: Lining your borders for a vibrant display every summer. Dahlia tubers: Get pack of four or eight dahlia 'cactus collection' tubers! Varieties: Get one or two each of 'Orange Turmoil', 'Yellow Star', 'Nuit d'Ete' and 'Badger Twinkle'. Peak height and spread: Approximately 100cm (height) x 50cm (spread). Flowers: Produces large, fully double blooms, in gorgeous colours. Re-plant: Can be lifted after the first hard frost of autumn, to be replanted the following spring. Dahlia 'cactus Collection' Tubers | Living Social