25 Seeds Ocean Mix Delphinium Flower Perennial Easy to grow truly spectacular perennial. Pacific giants are the tallest and showiest of all delphiniums, with spikes that reach 5 feet tall.this is a mix of dark purple, lavender and white,. This plant should be staked in high wind areas. They are long-lived sturdy bushy perennials. Will bloom the first year. Low maintenance beauties with long lasting flowers. Prefer full sun / partial shade and moist soil. Ideal for arrangements. Cut flowers will last 6-8 days in a vase. Blooms early june through late fall. Delpheniums are disease resistant.