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Delphinium Seeds & Plants
Delphiniums, also known as larkspur, are easy-to-grow flowers that add vertical color to your garden. Choose from baby blues or soft mixed hues that thrive in beds and borders. Shop our collection of unique varieties to grow reliable delphinium seeds and plants this season.
Are Delphiniums Easy to Grow from Seed?
Yes, delphiniums are surprisingly easy to grow with the right conditions. Start your seeds indoors 8–10 weeks before the last frost and transplant after the danger of frost has passed.
During the indoor growth process, you can use our Bio Dome to maintain optimal spacing and humidity levels.
When you're ready to transplant your delphinium seedlings, be sure to provide full sun and rich, well-draining soil for the best results.
Are Delphiniums Shade Plants?
Not quite. While delphiniums enjoy cooler temperatures, they still need full sun to thrive. Aim for a spot that gets at least 6 hours of sunlight each day. Afternoon shade in hot climates can help extend blooming.
If you're building your shade garden, try plants like caladium, hosta, or toad lily.
What Is a Companion Plant for Delphinium?
Delphiniums pair beautifully with several plants, including:
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Shasta daisies – These sun-loving perennials add contrast and attract pollinators.
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Foxgloves – Their tall spires mirror delphinium growth and thrive in similar soil conditions.
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Lupines – Nitrogen-fixing plants that improve soil and offer colorful spikes that blend well in cottage gardens.
Quick Tip: Avoid planting delphiniums near aggressive spreaders like mint or invasive groundcovers.
What Month Should I Plant Delphinium Seeds?
For spring blooms, start seeds indoors in late winter (January–March) if you live in USDA Zones 3–7. In Zones 8–10, you can also sow seeds outdoors in the fall for early growth the following spring.
Always check your USDA Hardiness Zone for the best timing to grow your delphinium seeds and plants.
5 Simple Steps to Grow Delphinium Seeds
Starting delphinium from seed is simple with a few careful steps. These cold-loving perennials need some special handling at first, but reward you with beautiful spires all season long. Here's how to grow them successfully:
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Chill your seeds: Refrigerate for 1–2 weeks to boost germination.
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Start indoors: Sow in seed-starting trays with quality potting mix.
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Keep moist and cool: Germinate at 60–65°F in indirect light.
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Transplant carefully: Move outdoors after hardening off.
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Stake tall varieties: Support growth and prevent wind damage.
Stick to these steps and you'll enjoy delphinium blooms that create a focal point in any sunny garden.
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