How to Grow Black-eyed Susan
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Supplies You'll Need
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Plant Overview
Growing Requirements
Sun
Full Sun (6-8 hours)
Water
Low (drought tolerant)
Spacing
18" apart
Depth
0.13" deep
Height
18-36"
Germination
7-14 days
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Seed Saving Guide
EasyWhen to Harvest Seed
Allow seed heads to dry on the plant through fall. Harvest before winter winds scatter seeds.
Processing
Rub dried seed heads to release small seeds, spread to dry further before storing.
Seed Viability
Up to 2 years when stored cool, dark, and dry.
Pro Tip
Native Rudbeckia self-sows freely — often no active seed saving is needed once established.
Seed Storage Supplies
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Raised Bed Planting Guides
A 4×8 bed fits 14 plants of Black-eyed Susan. See plant counts, spacing grids, and companion pairings for every bed size →
Black-eyed Susan Planting Calendar by Zone
Black-eyed Susan Planting Calendar by State
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Frequently Asked Questions
When should I plant Black-eyed Susan? +
Sow Black-eyed Susan 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 Black-eyed Susan take to grow? +
Black-eyed Susan typically blooms in about 85 days from planting. Exact timing varies by variety, soil conditions, and local climate.
Should I start Black-eyed Susan indoors or direct sow? +
Black-eyed Susan 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 Black-eyed Susan need? +
Black-eyed Susan requires full sun (6-8 hours) to thrive.
How far apart should I plant Black-eyed Susan? +
Space Black-eyed Susan plants 18 inches apart to allow adequate airflow and root development.
How much water does Black-eyed Susan need? +
Black-eyed Susan has low (drought tolerant) water needs. Consistent moisture is important especially during germination and early growth.
Can you save seeds from Black-eyed Susan? +
Yes — seed saving difficulty for Black-eyed Susan is rated easy. Allow seed heads to dry on the plant through fall. Harvest before winter winds scatter seeds. Rub dried seed heads to release small seeds, spread to dry further before storing.
How long do Black-eyed Susan seeds last in storage? +
Properly dried and stored Black-eyed Susan 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 Black-eyed Susan seeds open-pollinated? +
Yes — Black-eyed Susan 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 Black-eyed Susan
Native American wildflower with golden-yellow petals and dark brown centers. Extremely drought-tolerant and long-blooming. Attracts bees, butterflies, and finches.
Expect your Black-eyed Susan to be ready for harvest in approximately 85 days from planting.
Use the search above or browse by zone or state to find the perfect planting dates for your location.