How to Grow Larkspur
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Supplies You'll Need
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Plant Overview
Growing Requirements
Sun
Full Sun to Partial Shade
Water
Moderate (1 inch/week)
Spacing
9" apart
Depth
0.25" deep
Height
2-4 ft
Germination
14-21 days
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Seed Saving Guide
EasyWhen to Harvest Seed
Allow seed pods to turn brown and dry on the stalk. Harvest before pods split open.
Processing
Crack dry pods to release tiny seeds. Dry in open envelope for 1 week.
Seed Viability
Up to 2 years when stored cool, dark, and dry.
Pro Tip
All parts of larkspur are toxic — wash hands thoroughly after handling seeds. Self-sows readily once established.
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Raised Bed Planting Guides
A 4×8 bed fits 56 plants of Larkspur. See plant counts, spacing grids, and companion pairings for every bed size →
Larkspur Planting Calendar by Zone
Larkspur Planting Calendar by State
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Frequently Asked Questions
When should I plant Larkspur? +
Sow Larkspur seeds directly in the garden 4 weeks before your last frost date. Use the search on this page to find exact dates for your location.
How long does Larkspur take to grow? +
Larkspur typically blooms in about 65 days from planting. Exact timing varies by variety, soil conditions, and local climate.
Should I start Larkspur indoors or direct sow? +
Larkspur does best when direct sown outdoors. Plant seeds directly in the garden at the appropriate time based on your local frost dates.
How much sun does Larkspur need? +
Larkspur requires full sun to partial shade to thrive.
How far apart should I plant Larkspur? +
Space Larkspur plants 9 inches apart to allow adequate airflow and root development.
How much water does Larkspur need? +
Larkspur has moderate (1 inch/week) water needs. Consistent moisture is important especially during germination and early growth.
Can you save seeds from Larkspur? +
Yes — seed saving difficulty for Larkspur is rated easy. Allow seed pods to turn brown and dry on the stalk. Harvest before pods split open. Crack dry pods to release tiny seeds. Dry in open envelope for 1 week.
How long do Larkspur seeds last in storage? +
Properly dried and stored Larkspur seeds remain viable for up to 2 years. Store in a cool, dark, dry location in an airtight container with a silica gel packet for best results.
Are Larkspur seeds open-pollinated? +
Yes — Larkspur is open-pollinated, meaning seeds saved from your harvest will grow plants true to the parent variety. This makes it an excellent candidate for building a self-sustaining garden.
About Larkspur
Elegant cottage flower with delphinium-like spikes in blue, purple, pink, and white. Cool-season annual. Direct sow in early spring — does not transplant well.
Expect your Larkspur to be ready for harvest in approximately 65 days from planting.
Use the search above or browse by zone or state to find the perfect planting dates for your location.