Blue fountains delphinium Captivating blue, purple, and white flower spikes will only get to about three feet tall, but won't require any staking support. These huge blossoms will bloom in June and July, but can bloom again in the fall if cut back after flowering.
Delphinium Hummingbirds love delphinium, which blooms in early summer. Height for these perennials can average anywhere from 2 to 8 feet tall, depending on variety. Delphinium requires rich soil, and areas with relatively cool summers.