Sunflower Growing Guide
Growing Sunflower is easier than you think. This guide walks you through everything you need — from planting your first seed to harvesting.
At a Glance
Difficulty
Easy
Category
Flower
Sun Exposure
Full Sun
Frost Tolerance
Frost Tender
Cold Hardiness
Survives to 2°C
Plant Family
Asteraceae
Growing Season
Warm Season
Plant Lifecycle
Annual
Also grows well as
How to Start It
★ Recommended for beginners
Push the big seeds about 2cm deep where they're to grow after frost — fast and foolproof. Stake the tallest varieties.
A fast, dramatic annual that's perfect for kids and beginners — the big seeds are easy to sow and germinate quickly. Direct sow after frost where they're to grow (they have a taproot and resent transplanting), give full sun and support for the tallest types, and protect young seedlings from slugs. Leave the seed heads for the birds, or harvest them once the backs turn brown.
When To Start
First Chance to Plant
7 Days After Last Frost
Last Chance to Plant
60 Days Before First Frost
When should you plant Sunflower?
Your planting dates depend on your local climate. Sign up and add your location to unlock personalized dates.
Your Sunflower Planting Window
Start planting
May 15, 2026
Last chance
Sep 10, 2026
The Journey Ahead
Sunflower's Lifecycle
Seedling
Mature Plant
Seed Production
Step 2
Planting & Sprouting
Expect sprouts in 7–10 days
Growing Tips
- 1Sunflowers thrive in full sunlight, so plant them in a spot that gets at least 6-8 hours of direct sun each day.
- 2Water them deeply but infrequently, allowing the soil to dry out between waterings to prevent root rot.
- 3Use well-draining soil enriched with compost, and space the seeds about 6 inches apart to give them room to grow.
- 4To manage pests, consider using natural deterrents like neem oil or introducing beneficial insects such as ladybugs.
Seedling Phase
Step 3
Growth & Maturity
~70
Days to Maturity
200 cm
Mature Height
60 cm
Mature Width
Pests to Watch For
Diseases to Watch For
Mature Plant
Step 4
Harvesting
Harvest Window
21 days
When to Pick
Cut seed heads when back of head turns brown
How to Harvest
- 1Harvest sunflowers when the back of the flower head turns yellow and the seeds are plump and firm.
- 2Cut the stem about 12 inches below the flower head using sharp pruners to avoid damaging the plant.
- 3Handle the flower heads gently to prevent seed loss.
Step 5
Saving Seeds
How to Save Seeds
Saving seeds from your sunflower plant is easy and rewarding! Once the flower head turns brown and the back feels dry, simply cut it off and let it finish drying in a well-ventilated spot. Gently rub the seeds out with your fingers, and you’ll see how simple it is to collect your own seeds for next season. Store your seeds in a paper envelope or a glass jar in a cool, dry place—label them with the date and variety, and you’ll be ready to grow even more beautiful sunflowers next year. You’ve got this!
Seed Production
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