These vigorous, long-lived plants produce luminous, true pale blue, airy flower spikes in summer and then again in late summer to fall.
| Perennial | |
| Delphinium | |
| Larkspur | |
| Zone 4 | |
| 5-12 hours | |
| Moist, Sandy | |
| Accent perennial and cut flower | |
| Massed in the perennial border | |
| 3-4' | |
| 12-18" | |
| Fall, Summer | |
| Blue | |
| 1-1.5" | |
| Rapid | |
| Clump, Upright | |
| Straw | |
| Flower-tone, Lime | |
| Yes | |
| Yes | |
| Geranium, Achillea, Paeonia, Leucanthemum |