If you're looking for an especially long-blooming flower to bring color to your garden, your lawns borders or even a window box, decorative dahlias are a fantastic choice. With their wide, flat-tipped petals packed throughout their blooms, decorative dahlias sport a full, double bloom to brighten any garden or container with shades of pink, red, orange, lavender or yellow. Their leafy stems and rich green foliage help to fill out a flower bed beautifully. For gardeners looking to cultivate the perfect flowers for creating stunning bouquets in a vase, the formal varieties, with their more regular arrangement of petals, are a great option. Decorative dahlias planted in the spring will start showing flowers in mid-summer and will keep blooming continuously throughout the fall.