Matures 130-150 days: Also known as Pacific Coast hybrids, Delphinium elatum “Pacific Giant” is a group of regal delphiniums with tall, spiky blooms available in the colors shown. At maturity, the plants reach impressive heights of 1.5-2.5 meters “Pacific Giant” delphiniums are suitable for growing in plant hardiness zones 2 through 9. Long flower-filled spikes bloom in a beautiful blue. The flowers populating the spikes are symmetrically shaped, with huge 8 cm blooms. This delphinium also has mildew resistance.