Delphinium elatum Early blooms, outstanding uniformity and breathtaking color make Aurora Mix a champion delphinium. At 35-47 inches tall, the showy spikes of blues, purples, lavender and white make a magnificent display in both the flower garden and vase. A long-lived perennial, the plants produce tall, sturdy flower stems that fill with big, double florets. Hardy in zones 3-8. Germination code: (4) or (5)