Whether in a container, border or bouquet, Red Labyrinth is sure to be the center of attention. Individual petals twist and curve, showing off a light cream reverse and giving each massive, 6-8 in. bloom tons of body. Raspberry-red flowers keep their outstanding color from first emergence until full maturity, making for showstopping cut arrangements with a long vase life. Dahlias perform best when planted in full sun or partial shade, and you’ll want to lift in the fall in Zones 3-8.