Sunflower

Family: Asteraceae Oilseed and ornamental annual

Golden sunlight blooms with a confident, upright presence—Sunflower seeds yield heads that open like warm lanterns, their petals radiating rich, honeyed color.

The texture is bold and substantial, with a satisfying snap to the seed and a deeply aromatic, nutty character that shines in simple, roasted preparations and classic sunflower spreads. Grow Sunflower for show-stopping garden color and a dependable harvest at about 70 days, perfect for feeding the birds and delighting your own seed-saving rituals.

Light: Full SunMaturity: 70 DaysHabit: Upright

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Jul 4th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	70
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	55
Min Night Temp (°F)	40
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

Sunflower seeds bring a bold, toasty nuttiness with real crunchy bite—perfect when you want flavor without going soft. Toast them hard, salt them hot, and they’ll hold their texture in salads, spreads, and gritty little sauces where other seeds might blur.

Best Uses

dry-roasting seeds until fragrant, then salting hard for snack and topping
grinding into sunflower seed butter for nut-free spreads and sauces
stirring toasted seeds into grain salads where they stay crunchy
folding seeds into pesto-style pastes (seed + oil + acid + garlic)

Flavor Profile

deeply nutty, roasted-toasty aroma crisp seed snap with a buttery, oily finish warm honeyed character

Kitchen Pairings

lemon garlic black pepper olive oil honey smoked paprika

Frequently Asked Questions

What are common pests or diseases on Helianthus annuus, and how do I control them?

Watch for sunflower moth/caterpillars and chewing leaf insects; hand-pick early outbreaks and use an insect net or row cover until flowering. If you see white, powdery growth on leaves, treat with a horticultural oil or potassium bicarbonate and avoid wetting foliage since powdery mildew spreads quickly in humid, still air.

How often should I water Helianthus annuus during active growth?

Water deeply so the top 6–8 inches of soil stay evenly moist, typically about 1–2 times per week depending on heat and rainfall. During bud formation and early flowering, don’t let the soil dry out completely—consistent moisture supports larger heads, but avoid waterlogged soil to prevent root stress.

How can I tell when Helianthus annuus is ready to harvest?

Harvest when the back of the flower head turns yellow to tan and the seeds look plump with tight, mature shells (often about 70 days). The outer petals should have withered, and you should be able to rub a seed from the head without it being soft or hollow.