Guardian Blue Delphinium

Guardian Blue is a Delphinium elatum in PanAmerican Seed’s Guardian F1 series. The upright selection is listed at 30–39 inches tall by 10–12 inches wide, with outdoor hardiness in USDA zones 4a–7b. ## Garden Profile PanAmerican lists Guardian Blue for sun and early-spring to spring flowering. The Guardian series is suited to perennial landscape plantings, commercial cut-flower growing, and potted plant programs. Its blue color and compact width make it useful in a sunny border or a cut-flower bed; see the [Guardian Blue profile](https://www.panamseed.com/products/022103336000616/delphinium-guardian-blue/) and [2026–27 catalog entry](https://catalog.panamseed.com/view/445948364/133/). ## Planting Choose fertile, well-drained soil and a sunny site sheltered from strong winds. Give the upright flower stems room, especially when planting among other perennials. ## Maintenance Stake stems as they grow, water during dry weather to keep the soil moist but not soggy, and deadhead spent flowers to encourage more bloom. The [RHS perennial delphinium guide](https://www.rhs.org.uk/plants/delphinium/perennial/growing-guide) offers general care guidance.