How to grow delphinium

When to plant delphinium

Delphinium is a tall, short-lived perennial (NC State: lifespan 3 to 5 years) set out as a plant in spring. Plant in spring once the soil is workable in a sunny, sheltered, well-drained spot; it needs staking and benefits from cool, moist summers, with some afternoon shade in the southernmost zones.

Delphinium is timed by season rather than your frost dates, so the planting calendar does not generate ZIP-specific dates for it. Check the cited sources below to fine-tune for your area.