Growing Sunflowers
©Nannette Richford
Sunflower Varieties Range in Color and Size
Common sunflowers (Helianthus annuus) thrive in full sun in fertile well-drained soil. These annual flowers come in a wide variety of sizes, shapes and colors making them one of the most popular flowers for home gardens.
Planting Sunflowers in Your Garden
©Nannette Richford
Location: Choose a sunny location that receives at least 6 hours of direct sunlight a day. Full day sun is even better.
Soil: Add plenty of organic matter, like compost or well-rotted manure, to the soil. Although sunflowers will grow in poor soil, organic matter improves drainage and aeration and gives your sunflowers a source of nutrients. They perform best in fertile soil.
Planting Time: Plant sunflowers seeds in the spring after all danger of frost has passed in your area and the soil has warmed to at least 45 to 50 degrees Fahrenheit. Optimal germination occurs in soil between 70 and 78 degrees. Here in Maine that may mean as late as the first week of June in northern areas.
Seed Depth & Spacing: Sow seeds to a depth of 1/2 inch and cover them with soil. Firm the soil down with your hands to secure the seeds and remove air pockets around the seeds. Space seeds according to the directions of the seed packet. Short sunflowers can be spaced 4 inches apart, while taller sunflowers need 8 inches or more between plants.
Watering: Keep the soil moist until the seedlings emerge in approximately one week. Germination time varies, depending on the weather and soil conditions. Reduce watering to once or twice a week or whenever the soil feels dry to the touch one inch below the surface.
Soil: Add plenty of organic matter, like compost or well-rotted manure, to the soil. Although sunflowers will grow in poor soil, organic matter improves drainage and aeration and gives your sunflowers a source of nutrients. They perform best in fertile soil.
Planting Time: Plant sunflowers seeds in the spring after all danger of frost has passed in your area and the soil has warmed to at least 45 to 50 degrees Fahrenheit. Optimal germination occurs in soil between 70 and 78 degrees. Here in Maine that may mean as late as the first week of June in northern areas.
Seed Depth & Spacing: Sow seeds to a depth of 1/2 inch and cover them with soil. Firm the soil down with your hands to secure the seeds and remove air pockets around the seeds. Space seeds according to the directions of the seed packet. Short sunflowers can be spaced 4 inches apart, while taller sunflowers need 8 inches or more between plants.
Watering: Keep the soil moist until the seedlings emerge in approximately one week. Germination time varies, depending on the weather and soil conditions. Reduce watering to once or twice a week or whenever the soil feels dry to the touch one inch below the surface.
Sunflower Facts
- The tallest sunflower in the world measured an amazing 26.4 feet tall and was grown in Germany in 2009 by Hans-Peter Schiffer.
- The largest sunflower blossom measured 32.25 inches in diameter. It was grown by Emily Martin from British Columbia in 1983.
- The record for the most blooms on one plant goes to Melvin Hemker from St. Charles Michigan. He grew a sunflower with 837 blooms on one plant in 2001.
- Sunflowers attract aphids and are a great way to keep aphids off your garden veggies. Because sunflowers are tough plants, the aphids do not harm them.
- Sunflowers make delightful cut flowers. Try displaying them in a mason jar for country charm.
- Sunflowers follow the path of the sun when they are young, but as they mature almost all sunflowers face east. Plant sunflowers on the western or north-western border of your property so you can enjoy them when they are in bloom.
- If you are planting sunflowers near the vegetable garden or around flower beds, plant them on the northern border to prevent them from shading your other plants.