Answer: Delphiniums are perennial plants, but in your gardening region they're generally treated as annuals. You can sow seeds in March or April for bloom in late summer. The plants may come back the next spring, but if they don't, you can sow new seeds for late summer bloom.
If you want to start the seeds indoors, begin the process now. Otherwise, sow outdoors in March. Delphinium seeds require a 2 week chill prior to germination. Place the seeds in a plastic bag with some moistened growing medium and refrigerate for two weeks. Then sow on the surface of moistened seed starting mix and just cover with additional soil. Seeds should sprout in 14-28 days when kept at 50F-55F.
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