Common sunflower (Helianthus annuus)

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Common sunflower

Habit (mature) · Jim Evans / Wikimedia Commons · CC BY-SA 4.0

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Common sunflower

Helianthus annuus

A fast annual for sunny edible, pollinator, and children-friendly beds with bold summer flowers and seedheads.

Native: 40 US states + 4 CA provinces

Review: Source-backed

Focal point

Pollinator

Edible

Light

Full sun

Water

Moderate water

Mature size

18-120" tall · 24" apart

Lifecycle

True annual (one season)

Summer heat range

Warm-Hot

warm to hot summers Interim Plotwright tier until the plant AHS range is authored.

Native in Illinois

Yes

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Winter protection and storage

Frost cloth, plant covers, bulb/tuber storage supplies, burlap, and cold frames.

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Heat and sun protection

Shade cloth, shade hoops, cooling mulch, and heat-stress monitoring tools.

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Seed starting

Trays, cells, humidity domes, heat mats, grow lights, and seed-starting mix.

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Wildlife protection

Bird netting, deer fencing, rabbit guards, trunk guards, and crop covers.

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Transplanting and establishment

Trowels, transplant spades, starter fertilizer, root stimulators, and watering bags.

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Fertility and feeding

Compost, balanced fertilizer, slow-release plant food, and organic amendments.

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Native across 44 US states and Canadian provinces — a wide-ranging part of North America's plant communities.

Lady Bird Johnson Wildflower Center

Cold hardiness

This plant is grown as an annual; hardiness zones don't apply.

Heat tolerance

°C

°F

Loading current AHS heat-zone and plant heat-fit data at your coordinates…

Pollination

Self-fertile

Self-fertile — modern garden Helianthus annuus cultivars are bred to set seed without cross-pollination, though native wild sunflowers and some heritage cultivars retain partial self-incompatibility. The massive composite flower heads draw bees and butterflies in summer and seed-eating songbirds (especially goldfinches and chickadees) when seeds ripen.

Plants don't grow alone

Pollinates

Bee

Common eastern bumblebee (Bombus impatiens)

Pollinates

Bee

European honeybee (Apis mellifera)

Commercial sunflower-seed production relies on honeybee pollination at scale; sunflower honey is a recognized regional product.

Pollen forage

Bee

American bumblebee (Bombus pensylvanicus)

USDA Forest Service and Wikipedia note B. pensylvanicus favors sunflowers (Helianthus); common sunflower is a heavy pollen source.

Pollen forage

Bee

Long-horned bees (Melissodes spp.)

Seed forage

Specialist

Bird

American goldfinch (Spinus tristis)

One of the canonical late-summer goldfinch food sources; goldfinch breeding timing in much of North America is synchronized with sunflower seed maturation.

Seed forage

Bird

Eastern songbirds (multi-species) (multiple species (Passeriformes))

For people

Edible

Seeds are the iconic edible part — eaten roasted, raw, or pressed into oil. Young flower buds were traditionally steamed and eaten like artichoke hearts by Indigenous peoples of the Great Plains; petals are mild and edible in salads.

Edible parts

seeds, flower-buds, petals

Culinary use

Roasted seeds (salted or plain), sunflower-seed butter, sprouted seeds, cold-pressed sunflower oil; young buds steamed; petals scattered on salads.

Pet toxicity

Sunflower seeds are non-toxic to dogs in small quantities (per ASPCA), though salted commercial seeds and shell hulls can cause digestive upset.

Foraging context

Wild Helianthus annuus seeds are smaller and bitterer than cultivar seeds bred for the snack-food market; cultivated lines are the practical choice for kitchen-garden seed production.

Traditional medicinal use

A long-domesticated food staple of Indigenous peoples of the present-day United States (Hopi, Lakota, and others), with traditional uses ranging from food and dye to ceremonial use; modern medicinal claims should not be inferred from the food-staple history.