How to Grow Sunflowers

Here's the step-by-step process:

1. Choose your timing. Plant sunflower seeds outdoors after all danger of frost has passed and the soil temperature has reached at least 50°F. In most regions, this means late spring to early summer.
2. Prepare the planting area. Work a 3-inch layer of all purpose garden soil into the top 6 to 8 inches of native soil. This enriches the bed and helps roots establish quickly.
3. Sow the seeds. Use your thumb to push each seed 1 to 2 inches deep into the soil. Space standard cultivars 6 to 12 inches apart, and large branching types 18 to 24 inches apart. Cover gently and pat down.
4. Water in well. Give the planting area a thorough soaking immediately after planting, keeping the soil consistently moist (but not waterlogged) until seedlings emerge.

Sunflowers grow best in loose, well-draining soil that is rich in organic matter. Heavy clay that drains poorly suffocates sunflower roots; amend your garden bed with compost or garden soil before planting to improve drainage and aeration.

Direct sowing is the easiest method for most cultivars.

1. Prepare the bed. Loosen the soil to a depth of about 8 inches and mix in compost or enriched garden soil for added nutrients and improved drainage.
2. Plant seeds. Push each seed 1 to 2 inches deep, spacing them according to the cultivar (6-24 inches apart). For a continuous display, plant a new row every two weeks through early summer.
3. Water and protect. Water the area gently but thoroughly. If squirrels or chipmunks are a problem in your area, sprinkle ground cayenne pepper around the planting area to discourage digging.

Starting seeds indoors gives you earlier blooms and helps in regions of the country with a short-season.

1. Time it right. Begin 2 to 3 weeks before your last expected frost date. Sunflowers do not like having their roots disturbed, so use biodegradable peat pots you can plant directly in the ground.
2. Plant the seeds. Fill each pot with moistened seed-starting mix and plant a seed about 1 inch deep. Place pots in a warm spot (70-75°F) near a sunny window or under grow lights.
3. Keep soil moist. Mist the surface daily to keep it evenly damp. Seedlings should appear within 7 to 10 days.
4. Harden off. About a week before transplanting, set seedlings outside for a few hours each day, gradually increasing their exposure to sun and wind. Then plant them in their permanent garden spot once the soil is warm.

Sunflower seeds are fast germinators, so you will not have to wait long to see signs of growth. Under ideal conditions with warm soil and consistent moisture, most sunflower seeds sprout within 7 to 10 days after planting.

Beyond watering and feeding, a few care techniques keep blooms coming.

Deadheading spent flowers on branching cultivars redirects energy toward new buds.

1. Wait until a bloom has faded and the petals begin to wilt or drop.
2. Trace the stem down to just above the next leaf node or side branch, and snip with clean, sharp pruners.
3. Continue checking the plant every few days and remove any additional spent blooms to keep the flower show going.

Note: Single-stemmed giant cultivars produce only one large flower head, so deadheading does not apply to those. Let the head mature fully if you plan to harvest seeds.

Stay on top of these daily tasks:

• Staking: If you’re wondering how to stake tall sunflowers, drive a sturdy bamboo or wooden stake about 3 inches from the base. Choose a stake that is at least as tall as the plant's expected mature height (8 to 12 feet for giant cultivars). Loosely tie the stem to the stake with soft twine. For a larger planting, create a lattice of stakes and string for plants to grow through. Stake early, before the plants get top-heavy.
• Weed control: Pull weeds regularly around the base of your sunflowers to eliminate competition for water and nutrients. A 2- to 3-inch layer of mulch helps suppress weeds and retain soil moisture.
• Critter watch: If you want to know how to stop squirrels from eating sunflower seeds, cover maturing seed heads with lightweight cloth or mesh bags tied snugly around the stem. This also deters birds while still allowing air circulation.
• Leaf check: Inspect leaves weekly for signs of yellowing, spots, or insect damage. Early detection makes treatment far simpler.

Tiny, soft-bodied insects that cluster on new growth and leaf undersides, sucking sap and causing distorted leaves. A strong blast of water from the hose knocks most aphids off. For persistent infestations, treat with insecticidal soap or an insecticide product labeled for aphids following label directions.

Caused by the soil-borne pathogen Plasmopara halstedii, downy mildew produces yellow patches on upper leaf surfaces with grayish fuzz underneath. It thrives in cool, wet conditions and can survive in soil for years. Improve air circulation through proper spacing, remove affected leaves immediately, and rotate sunflower plantings to a new location each year.

Overwatering or poorly draining soil creates conditions for root rot, which shows up as yellowing, wilting foliage even when the soil is moist. Prevention is the best cure. Amend heavy soils with compost or all purpose garden soil, and always let the top 2 inches dry between waterings.

These small beetles lay eggs in developing seed heads, and the larvae feed on seeds from the inside. Inspect flower heads regularly and remove any that show premature seed damage. Planting early in the season can help flowers mature before weevil populations peak.

Container growing works well for patios and small spaces. Choose a container at least 12 inches in diameter with drainage holes, filled with well-draining potting mix. Compact cultivars like 'Teddy Bear' stay under 3 feet and perform beautifully in containers. Water containers more frequently than in-ground plants, and feed every two to three weeks with plant food.

Seed saving is the primary propagation method for annual sunflowers.

1. Let a flower head mature on the stalk. Leave the head on the plant until the back turns brown and the seeds are plump and firm. Drying sunflower heads on the stalk allows the seeds to develop fully.
2. Cut and dry. Snip the head with about 12 inches of stem attached and hang it upside down in a cool, dry, well-ventilated area for one to two weeks.
3. Remove the seeds. Once completely dry, rub the face of the flower head with your thumb to pop the seeds free. Store seeds in a labeled paper envelope in a cool, dark place until planting time the following spring.

1. Cut stems in the early morning when the flower is just beginning to open and the petals are still firm. This is when stems hold the most water and blooms last longest.
2. Use sharp, clean shears and cut at a 45-degree angle. The cut stem should be at least 18 to 24 inches long.
3. Place cut stems immediately into a bucket of cool water and strip any leaves that would sit below the waterline to prevent bacterial growth.

1. Leave the flower head on the plant until the back turns dark brown or black and seeds appear dry and plump. Covering the head with mesh during this stage helps keep wildlife from helping themselves to your harvest.
2. Cut the head with several inches of stem attached and hang it upside down in a well-ventilated, dry area for about two weeks.
3. Rub the dried seeds free and store them in a breathable paper or cloth bag in a cool, dark location. Properly stored sunflower seeds remain viable for two to three years.