The illustrated growing guide
Sunflower
Helianthus annuus
Family Asteraceae
Grown as an annual
Direct sow after frost — transplants sulk. For eating seeds, bag heads with cheesecloth when petals drop or birds strip them in a day. Succession sow cutting types every 2 weeks.
Full Sun
Low water
Very Fast growth
Native to North America
Attracts bees
None winter chill
From the print shop
Growing sunflower? Hang it.
Our Wildflowers & Meadow collection carries sunflower — Helianthus annuus, print Nº 15, “Sunflower.”
16 designsfrom $21.99white or black groundmatte poster, unframed
I
Overview
Will sunflower suit your garden, and what goes wrong.
Will it fruit where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what sunflower actually needs.
Life cycleAnnualSunflower at a glance
Common sunflower problems
- Birds/Squirrels at seed
- Sunflower Moth
- Rust
- Downy Mildew
II
Growing
Light, water, soil, propagation and the season’s jobs.
How to grow sunflower: light, water & soil
How to plant & propagate sunflower
III
The year
What sunflower asks for, month by month.
The sunflower year, month by month
BloomHarvestWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
- Harvest — picking time — check ripeness every few days.
The sunflower year as text
- Jan quiet month
- Feb quiet month
- Mar quiet month
- Apr quiet month
- May quiet month
- Jun harvest
- Jul bloom, harvest
- Aug bloom, harvest
- Sep bloom, harvest
- Oct harvest
- Nov quiet month
- Dec quiet month
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
IV
Ecology & uses
What it does for the garden, and what it is grown for.
Sunflower in the garden system
- Herbaceous layer annual
- Nectary/insectary
- Hosts Silvery checkerspot, bordered patch, painted lady
- Keystone: Keystone perennial — hosts 60+ caterpillar species
What sunflower is grown for
✓ Commonly eaten
Harvesting & storing sunflower
Cut flowers all summer; seed heads September - October. About 70-100 days from planting.
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
V
Cultivars
Named varieties of sunflower, ruled as a catalogue.
Best sunflower varieties & cultivars
'Mammoth', 'ProCut' series, 'Lemon Queen'
VI
Sources & plant ID
Where the care distinctions come from, and how the plant is filed.
Research basis
Sources behind this profile
No extension citations are attached to sunfloweryet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
VII
Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
VIII
Questions
Sunflower questions, answered straight.
Is sunflower safe for kids and pets?
Sunflower is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.
When do you harvest sunflower?
Cut flowers all summer; seed heads September - October. From planting, expect about 70-100 days to maturity.
How do you propagate sunflower?
From seed.
IX
Elsewhere
Where sunflower sits in the library.
Zinnia
Peony
Daylily
Hardy Banana