Field Specialist in Horticulture
Sunflowers are an easy, fast-growing flower that can add much fun to the garden. They can be grown for flowers or for seed. Learn about common varieties and how to grow them in this one-page guide.
- Large — Titan, Cyclops, Mammoth Russian, Mammoth Grey Striped, American Giant
- Semi-dwarf and dwarf — Teddy Bear, Sunspot
- Fall colors — Autumn Beauty, Crimson Queen, Evening Star, Ring of Fire
- Cut flower — Sonja, Jade
- It takes 70 to 120 days until bloom, depending on variety of sunflower. To determine planting date, establish when you want blooms to occur. Then count back on
- the calendar by those number of days.
- Stagger planting times to extend continuous bloom. Can be planted every 2 to 3 weeks.
- Plant seeds no deeper than 1 inch and no closer than 6 inches apart.
- If you plant a variety that gets taller than 10 feet, stake or brace it.
- When cutting flowers for bouquets, cut early in the morning before the heat of the day to avoid wilting.
- Seedlings can be started indoors 4 to 6 weeks before last average frost date.
- Establish seed planting dates. Planting should be after the last expected frost.
- Select a location with more than 6 hours of sun and well drained soil.
- Remove weeds; turn over the soil or till the soil with hand cultivator and trowel.
- Add a handful of compost or potting mix to the soil; mix into the soil.
- Plant in rows; make a trench 1-inch deep.
- Varieties 2 to 5 feet tall, plant 6 inches apart.
- Varieties over 5 feet, plant 12 inches apart.
- Giant varieties, plant 24 inches apart.
- Plant seed; cover with 1 inch of soil.
- Water sunflower seeds.
- Seeds will germinate in about 7 to 10 days.
- If too many seeds are planted, thinning may be required.
- Sunflowers can withstand dry weather however regular watering will create strong roots that prevent toppling windy conditions.
- Fertilize every 2 to 3 weeks with compost or fertilizer; keep plants healthy.
- Weed control by hoeing or mulching.
- Control insects and diseases.
MU Extension publication G4701, Sunflowers: A Versatile Native Crop