How to Grow Zinnia
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Supplies You'll Need
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Plant Overview
Growing Requirements
Sun
Full Sun (6-8 hours)
Water
Moderate (1 inch/week)
Spacing
12" apart
Depth
0.25" deep
Height
12-36"
Germination
5-10 days
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Common Zinnia Varieties
Popular cultivars to look for at your local nursery or seed supplier.
California Giant
Large 4–5 inch double flowers on tall stems; superb for cutting.
Benary's Giant
Top-rated cut flower series with strong stems and an enormous color range.
Envy
Unique lime-green zinnia that pairs beautifully with warm-toned flowers in arrangements.
Zahara
Disease-resistant series with smaller, mounded habit — excellent for beds and containers.
Days-to-maturity figures are approximate and vary by climate and growing conditions.
Seed Saving Guide
EasyWhen to Harvest Seed
Let flower heads dry completely on the plant — petals should be fully brown and papery.
Processing
Pull dried flower heads apart to find arrow-shaped seeds, dry 1 additional week.
Seed Viability
Up to 3 years when stored cool, dark, and dry.
Pro Tip
Zinnias cross easily — for pure color, save from just one variety or bag flowers before they open.
Seed Storage Supplies
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Raised Bed Planting Guides
A 4×8 bed fits 32 plants of Zinnia. See plant counts, spacing grids, and companion pairings for every bed size →
Zinnia Planting Calendar by Zone
Zinnia Planting Calendar by State
Other Plants
Frequently Asked Questions
When should I plant Zinnia? +
Sow Zinnia seeds directly in the garden 1 weeks after your last frost date. Use the search on this page to find exact dates for your location.
How long does Zinnia take to grow? +
Zinnia typically blooms in about 60 days from planting. Exact timing varies by variety, soil conditions, and local climate.
Should I start Zinnia indoors or direct sow? +
Zinnia 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 Zinnia need? +
Zinnia requires full sun (6-8 hours) to thrive.
How far apart should I plant Zinnia? +
Space Zinnia plants 12 inches apart to allow adequate airflow and root development.
How much water does Zinnia need? +
Zinnia has moderate (1 inch/week) water needs. Consistent moisture is important especially during germination and early growth.
Can you save seeds from Zinnia? +
Yes — seed saving difficulty for Zinnia is rated easy. Let flower heads dry completely on the plant — petals should be fully brown and papery. Pull dried flower heads apart to find arrow-shaped seeds, dry 1 additional week.
How long do Zinnia seeds last in storage? +
Properly dried and stored Zinnia seeds remain viable for up to 3 years. Store in a cool, dark, dry location in an airtight container with a silica gel packet for best results.
Are Zinnia seeds open-pollinated? +
Yes — Zinnia 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 Zinnia
Vibrant, heat-loving annual with prolific blooms in every color. Attracts butterflies and pollinators. Cut-and-come-again — the more you pick, the more it blooms.
Expect your Zinnia to be ready for harvest in approximately 60 days from planting.
Use the search above or browse by zone or state to find the perfect planting dates for your location.