Create an impressive display with this superb double-flowered dahlia mixture. Produces bushy, mid green foliage & large flowers in a great range of colours. Flowers June to first frosts. Height 30cm (12); spacing 30cm (12). While many people grow them as annuals, dahlias are in fact tender perennials, forming a tuber under the earth which, if lifted in autumn & stored in a frost-free place, can be planted again the following spring.