How to Grow Sunflowers: a Beautiful and Tasty Addition to Your Landscape

Helianthus annuus

One of my favorite summer memories comes from the summer of 2012, when I spent six weeks studying Spanish in Spain with my sister. The school regularly took us on trips to popular and historically significant towns and regions in the country.

On one trip to Barcelona from Valencia, we drove past fields of sunflowers.

A vertical close up picture of a large sunflower blooming in the garden with bright yellow petals contrasting with the blue sky in the background. To the center and bottom of the frame is green and white text.

They were so alluring that the driver stopped the bus and let all the students hop out to take photos of the tall beauties. They filled our hearts with joy, as sunflowers do.

In Spanish, the word for sunflower is girasol, which translates to “a trip around the sun,” or mirasol, which translates to “looks at the sun.”

How lovely is that?

Even if you don’t have the option to travel to Spain right now – oh, how I’d love to go back! – you can grow beautiful sunflowers right in your own yard or garden.

A close up of a bright yellow Helianthus annuus flower growing in the garden in front of a maroon colored wooden fence, with dark green foliage.
Photo by Laura Melchor.

In this guide, we’ll tell you everything you need to know to grow your own joy-inducing Helianthus annuus flowers.

Here’s what’s ahead:

Cultivation and History

Sunflowers are as delicious to eat as they are joyful to look at.

Lots of people love snacking on the seeds. Personally, I love sun butter as a substitute for peanut butter. And the oil from these giant beauties is used in cooking all over the world.

A close up of a glass containing sunflower oil, surrounded by seeds, with a yellow flower in the background, set on a wooden surface.

Plus, you’ll often find the seeds in birdseed mixes and suet cakes. The birds love them, too!

The versatile H. annuus is a member of the Asteraceae or daisy family, along with marigolds, asters, and the humble dandelion, to name a few.

A close up of two birds on a feeder containing seeds on a soft focus background.

Like many other members of the daisy family, sunflowers are heliotropic, meaning the blossoms turn to follow the sun when they’re growing and developing.

But once a flower reaches maturity, it settles into a comfortable east-facing position and stays there until it dies.

A meadow of purple and yellow flowers with large trees with fall colors in soft focus in the background.

Because of its many culinary uses, H. annuus is grown around the world as a food crop. Ukraine and Russia alone produce half the world’s supply, with Argentina, Turkey, France, Hungary, Spain, and China growing most of the remainder of what’s sold commercially.

Despite its global renown, the sunflower originated in North America and was a major food crop for many indigenous peoples. Today, it’s mainly grown on farms in North and South Dakota, Minnesota, California, Colorado, Kansas, Nebraska, and Texas.

A vertical close up picture of a large Helianthus annuus flower, the bright yellow petals contrasting with the green foliage and the blue sky in the background.

The flower made its way to the rest of Europe via explorers who brought seeds to Spain. From there, gardeners spread the flower throughout the rest of the continent and on to Russia.

Along with their cheerful beauty and long-standing culinary value, sunflowers are also known for their height.

While wild H. annuus is a branching flower that supports more than one bloom, single-stem, single-bloom cultivars are popular for their incredible height.

Some varieties are among the tallest flowers grown anywhere. At fall festival competitions, it’s not unusual to see these behemoths topping twenty feet.

A close up of three sunflowers growing in a border outside a brick home.

Midsize varieties grow six to ten feet high, and some people prefer these for their disproportionately large blossoms. The really big plants have smaller flowers, because their long stems cannot support anything heavier.

Smaller cultivars that grow to only two to three feet or less are popular as well, especially among gardeners who like to grow theirs in containers.

Ready to grow your own? Let’s get started!

Propagation

If you’re a beginning gardener or you want a fun gardening project for your kids to do, growing H. annuus is the way to go.

These flowers are super easy to grow, and they aren’t picky about their growing conditions. You can propagate them from seed or transplant seedlings from the store.

Growing from Seed

Like other plants with taproots, sunflowers grow best when sowed directly into the yard or garden. This gives them plenty of space and time to develop the taproots and send them down deep.

We’ll focus on that method first.

H. annuus flowers are annuals, so you can grow them just about anywhere, but they don’t like to get too cold.

They prefer USDA Hardiness Zones 2-11, and they definitely want you to wait to plant them outdoors until all danger of frost has passed.

A close up of a hand from the right of the frame sowing a Helianthus annuus seed into rich, dark soil, on a soft focus background.

Though these tough blooms will grow almost anywhere they’re planted, it’s best to select an area with at least six to eight hours of sunlight per day and rich, well-draining soil.

They should still do alright in less than ideal conditions, they just might not grow as big and strong!

Dig a shallow trench of about one inch deep and place the seeds inside. If you want small flower heads, plant the seeds two to four inches apart.

For larger heads, plant six to eight inches apart. This is true even for larger cultivars, although the smaller size will be relative: a smaller ‘Russian Mammoth’ flower, for example,  won’t be as small as a smaller ‘Dwarf’ variety.

A close up of dark rich soil with fresh Helianthus annuus seeds sown and ready to cover.

When I planted my seeds last year, I didn’t pay close enough attention to spacing. The result? Some heads were fully developed and had a nice size, while others – dwarfed by their sisters – stayed tiny.

Here’s what my bigger sunflowers looked like:

A close up vertical picture of a bright yellow Helianthus annuus flower growing amongst dark green foliage with a maroon wooden fence in the background.
Photo by Laura Melchor.

And my tiny ones, which still looked lovely in a vase indoors, looked like this:

A close up vertical picture of two Helianthus annuus flowers in a glass vase set on a windowsill in bright sunshine with a garden scene in soft focus in the background.
Photo by Laura Melchor.

So keep this in mind while planting! Some plants will overshadow others, but the smaller ones will be ideal for bouquets.

Once you’ve set the seeds in the trench, cover them with an inch of soil and water thoroughly. Keep moist until germination, which should occur in 7-10 days.

As soon as the first set of true leaves emerges, thin any stray seedlings that are too close together – those that are growing more closely than two inches from their neighbors.

Also, did you know that sunflower sprouts are edible? So instead of tossing the extra seedlings in the trash, toss them into a salad.

That’s all there is to it! You’ll see flowers in anywhere from two to three months, depending on the variety.

A close up of a tiny seedling germinating from the soil, on a green soft focus background.

Now, if you really want to sow seeds indoors before the danger of frost passes, you can do it.

You’ll want to start just a few weeks before the last frost date so that the plants don’t get too big in the seed trays.

If they grow too large while the roots are still trapped in a small cell, they may not thrive once they’re moved outdoors.

Sow two seeds each, one inch deep, in starter trays or peat pots. Keep them moist.

Thin seedlings once they have a set of true leaves, keeping the strongest one in each pot or cell, and transplant them out after all danger of frost has passed, or when seedlings are about three to four inches tall.

Harden them off for about a week before planting out in the garden.

Transplanting Seedlings

If you find seedlings at the store or have grown your own in starter trays, here’s how to transplant them outdoors.

A close up of black plastic seed trays with small green seedlings with the first true leaves appearing, on a soft focus background.

Find a location that gets at least six to eight hours of full sun every day and has rich, well-draining soil. Dig a hole the size of the root ball, carefully remove the plant from the starter tray, and place it into the hole. Tamp the soil back over it, and water in well.

Space each hole two to twelve inches apart, depending on your flower head size preference and the cultivar you have selected.

Check the seed packet to make sure, and keep in mind that branching varieties need more space than single-stemmed types.

A close up of small Helianthus annuus seedlings, growing in dark rich soil, in light sunshine fading to soft focus in the background.

If you started your seeds in biodegradable peat pots, place the entire pot directly into the soil.

Water thoroughly, and then voila! You’re done, transplanting accomplished.

How to Grow

Sunflowers can handle high temperatures, as they love warmth, but they hate freezing temperatures and don’t like frost.

Here’s a secret: they can handle a teeny tiny bit of frost, so if a surprise light frost hits later in the season than usual, they’ll probably be okay.

A close up of the back of a Helianthus annuus flower with a light frost dusting the plant, pictured in light sunshine on a soft focus background.

In fact, remember that photo of a big bloom from my flowerbed? It thrived even after the first fall frost hit Alaska. But don’t count on that!

To keep your blooms happy and strong for their summer growth, water them once or twice a week, depending on how much rain you get.

To check the soil for moisture, stick your finger one inch down. If you don’t feel anything wet, give your plants a good inch of water each.

If wind is a problem as the flowers grow taller, you can stake them. A good trick is to plant sunflowers close to a fence, which can be used for support.

A close up of Helianthus annuus flowers growing in the garden in light sunshine on a soft focus green background.

For branching varieties, pinch the tops when they have four to five sets of true leaves to encourage bushy growth and multiple flower heads.

But keep in mind that branching varieties will naturally branch out, so this isn’t strictly necessary to obtain more than one lovely flower.

Sunflowers don’t need a lot of fertilizer, but a little can help. Phosphorus and potassium can encourage bigger blooms, while nitrogen supports leaf growth.

Aim to find a balanced 5-5-5 (NPK) fertilizer, which you’ll only need to use once. Add it to the planting area according to package instructions when seedlings have several sets of true leaves.

Growing Tips

  • Plant after the last frost
  • Keep seeds moist until germination
  • Plant in an area with full sun (at least 6-8 hours of direct sunlight)
  • Fertilize lightly with a balanced 5-5-5 NPK fertilizer

Cultivars to Select

Here’s a nice, varied selection of sunflowers, both tall and small(ish), to grow in your home garden:

Mammoth Russian

Want an enormous bloom to enter into a state fair competition? Look no further than ‘Mammoth Russian,’ which grows up to 144 inches tall and boasts a huge, twelve-inch, sunny heads.

‘Mammoth Russian’ also produces excellent seeds for snacking, with thin, easy-to-crack shells and meaty kernels.A close up of Helianthus annuus 'Mammoth Russian' flower with blue sky in the background.

‘Mammoth Russian’

Flowers will bloom about two months after planting, with harvestable seeds available in another two to four weeks.

Find packets of 200 seeds at Burpee.

Wild Sunflower

For an excellent supply of summer-long bouquets, succession-plant these beauties in your garden for four or five weeks in the spring.

A close up of a bright yellow Helianthus annuus 'Wild' flower growing in the garden on a soft focus background.

‘Wild Sunflower’

Blooming in just over two months from sowing, you’ll have a near-constant supply of three-foot-tall plants with delicately cheerful blooms to gaze at in the garden, or cut and enjoy in vases and arrangements.

You’ll find seeds in a variety of package sizes, from a small packet to a five-pound sack at Eden Brothers.

Velvet Queen

You didn’t think sunflowers only came in shades of yellow and orange, did you?

A close up of a Helianthus annuus 'Velvet Queen' flower with deep red petals, pictured on a green soft focus background.

Okay, well, I did. Until I discovered this alluring cultivar, which boasts petals in a deep mahogany that reminds me of red velvet cake against a black-seeded center.

A close up of a Helianthus annuus 'Velvet Queen,' a variety of red sunflower pictured growing in the garden on a soft focus background. To the bottom right of the frame is a white circular logo with text.

‘Velvet Queen’

Try mixing these three-foot-tall plants with one of the yellow varieties for a captivating show in your garden.

Seeds are available from True Leaf Market in packets ranging from two grams to one pound.

Managing Pests and Disease

There are a variety of maladies and creepy-crawlies to watch out for when you’re growing sunflowers.

Let’s take a look.

Omnivores

There are two main omnivore pests (or guests) that will happily eat your sunflowers, most notably once the seeds develop..

Read on to find out who they are!

Squirrels and Birds

These critters adore the seeds, with good reason. So do we, after all!

A close up of a small bird on a metal pole looking quizzically at a Helianthus annuus flower on a soft focus background.

If you’re trying to save them for your own use, cover the heads with a piece of cheesecloth or screen after the seeds start to develop.

Read more here for tips and tricks on protecting your seeds from birds and squirrels.

Or do what many gardeners do: allow the bright blooms to act as a natural bird and squirrel feeder, and let the animals have their share.

Insects

Which bugs bother our cheerful blooms the most? Here are the top five sunflower foes.

Cutworms

Unfortunately for sunflowers, there are several cutworm species that prey on these sunshine-loving plants:

The dingy cutworm (Feltia jaculifera), named for its dingy brown color; the darksided cutworm (Euxoa messoria), which sports darkish stripes on its sides; the tan, sandy-colored sandhill cutworm (Euxoa detersa); and the dark gray black cutworm (Agrotis ipsilon).

A close up of a Euxoa messoria larvae on a green leaf pictured on a soft focus background.
Euxoa messoria. Photo by Frank Peairs, Colorado State University, Bugwood.org, via CC BY-SA.

Cutworms are moth larvae, and they eat the foliage, creating holes in young leaves, and making young plants wilt and sometimes die.

While they feed mostly at night, cutworms like to hang out during the day in the soil, or under weeds growing within a few feet of their chosen victim.

If you notice cutworm damage and find larvae nearby, it’s time to handpick as many as you can find and get rid of them.

You can also spread diatomaceous earth around the plant to kill the soft-bodied insects, or release beneficial nematodes, like these from Arbico Organics.

Grasshoppers

These common bugs don’t do tons of damage to sunflower plants, but they do like to chew on the foliage and sometimes the seeds.

A close up of a green grasshopper in the center of a Helianthus annuus flower, on a yellow soft focus background.

According to experts at the Department of Entomology at Kansas State University,  they don’t tend to destroy entire plants. Commercial growers should plan to do something to deter grasshoppers if they notice more than eight per square yard.

Using a grasshopper deterrent that doesn’t harm other insects or the plant itself is ideal.

A close up of the packaging for a grasshopper deterrent.

Nolo Bait from Arbico Organics

Try Nolo Bait, a coated bran flake that infects grasshoppers with Nocema locustae, a pathogen that only affects grasshoppers and crickets.

Nolo Bait is available from Arbico Organics.

To prevent an infestation, try planting squash, peas, or tomatoes in the same area as your sunflowers – grasshoppers tend to avoid these.

Sunflower Beetles

This 1/4- to 3/8-inch-long beetle (Zygogramma exclamationis) sports a reddish-brown head and a creamy, striped body.

A close up of a small striped beetle feeding on the green stem of a plant, pictured on a soft focus background.
Photo by Robert Webster via CC BY-SA.

The fat, greenish larvae and the adults both like to eat through the foliage, often skeletonizing entire plants.

If you catch these insects early and repel them with insecticidal soap or neem oil, there’s a good chance your sunflower crop will survive and thrive.

Sunflower Bud Moths

This moth’s cream-colored 3/8- to 5/8-inch larvae (Suleima helianthana) do the damage here.

They like to bore into stems, and occasionally budding flowers. They tend to make themselves so at home within a plant that they leave lots of visible black frass, or excrement, behind.

A close up of a small larvae worm on a white background.
Photo by Frank Peairs, Colorado State University, Bugwood.org, via CC BY-SA.

If any of your sunflower stems or buds have curled inward and they sport a strange black substance around the damaged area, you probably have bud moth larvae on your hands.

Thankfully, if the larvae stay inside the stems, your buds will probably open just fine. But if they decide to attack the unopened buds as well, those flowers will be ruined.

Bud moth infestations are usually small and insecticides aren’t helpful.

To reduce the chance of an infestation, keep the surrounding area free of weeds, which can be host plants for the moths and their larvae.

Sunflower Headclipping Weevils

Think of these small black weevils (Haplorhynchites aeneus) as little sunflower serial killers.

The female weevils chew through the stems of flowers just below the blooms, cutting most of the head off the plant.

But instead of finishing the decapitation, the females mate with male weevils inside the cuts they’ve made in the hanging flower heads, and then after the heads eventually fall to the ground, the eggs hatch.

A close up of Helianthus annuus plants cut down to the ground and set on the soil, with scrubby weeds in the background in soft focus.

If these flower heads are left on the ground, the weevil larvae will feed on them, move into the soil to overwinter, and emerge as adults the following summer, ready to wreak more havoc in your flower patch.

The best thing to do if you notice decapitated flower heads is to burn or otherwise get rid of them.

To control existing infestations, spray the backs of the flower heads with insecticidal soap or a neem oil mixture.

Disease

These diseases can cause some serious damage to your crop, so it’s best to check for signs of these common culprits as often as you can.

Alternaria Blight

Is your sunflower foliage suddenly speckled with yellow-ringed black spots? Or are the stems developing dark streaks and splotches, like an overripe banana?

Your plant may be suffering from Alternaria, a blight that affects leaves, stems, and sometimes flower heads. It is caused by the fungi Alternaria helianthi and A. zinniae.

To avoid infection, refrain from overhead watering and make sure there’s plenty of airflow between plants. If infected, spray with a fungicide, and remove and destroy the plant at the end of the growing season.

Phoma Black Stem and Phomopsis Stem Canker

If the stems begin turning black and the rest of the plant wilts too, your flower might be suffering from Phoma black stem or Phomopsis stem canker. These infections are caused by the fungi Phoma macdonaldii and Phomopsis helianthi, respectively.

A close up of a large plantation of sunflowers afflicted by a disease and all the plants dying off.
Photo by Howard F. Schwartz, Wikimedia Commons, via CC BY-SA.

There’s no effective fungicide available for treating these diseases, so the best thing to do is practice crop rotation, select resistant cultivars, avoid overly damp conditions, and ensure adequate airflow between plants.

Rhizopus Head Rot

The first signs of this infection, caused by the fungi Rhizopus arrhizus, R. stolonifer, and R. microsporus, are black spots on the backs of your sunflower heads.

Once these spots develop, it’s only a matter of time before the entire head shrivels and fills with spores can easily spread to surrounding plants in windy conditions.

While there are no effective control measures available, keeping sunflower head moth and bud moth populations under control can help to prevent the spread of this disease. The moth damage tends to make plants more susceptible to Rhizopus Head Rot.

Rust

Various types of fungal rust infections can plague sunflowers, including yellow rust (caused by Coleosporium helianthi), white rust (caused by Albugo tragopogonis), and red rust (caused by Puccinia helianthi).

A close up of a large green leaf showing the symptoms of white rust, white spots over the surface.
Photo by Howard F. Schwartz, Wikimedia Commons, via CC BY-SA.

Depending on the type of rust, these cause orange, yellow, or whitish spots to develop on leaves and sometimes even the stems.

Use a copper-based fungicide to treat rust, and try to avoid it in the first place by planting resistant cultivars, keeping leaves dry, and disinfecting all your gardening tools between each use and between plants to prevent spread.

White Mold

Also known as Sclerotinia wilt, white mold is the most devastating sunflower disease out there.

A close up of a stem of a plant suffering from a disease called Sclerotinia Sclerotiorum, on a soft focus background.
Photo by Jymm, Wikimedia Commons, via CC BY-SA.

Caused by a fungal pathogen, Sclerotinia sclerotiorum, the disease usually hits the roots first, making the sunflower wilt suddenly. And then – as though that wasn’t enough – a canker develops at the base of the plant and eventually takes over much of the stem.

There’s not much you can do once white mold hits your sunflower patch, except pull and destroy affected plants and hope that the disease doesn’t spread too much.

Next season, plant a non-host, such as corn or another grain, in the area and avoid giving sunflowers a home there again for four years.

Harvesting

Harvest the seeds after most of the flower petals have died and dropped off. Then, cut off the seed heads and about two inches of stem.

A close up of a Helianthus annuus flower that has dropped its petals and gone to seed on a soft focus background.

Hang the heads to dry by their stems in a well-ventilated area. Once they are completely dry, rub the flower heads together to loosen them, and the seeds should be easy to extract.

A close up of the seeds in the center of a sunflower, ready to harvest.

One way to prepare the seeds for eating is to soak them in salty water overnight, drain them, and spread them on a baking sheet to roast for three hours at 200°F.

Yum!

Read more about harvesting sunflower seeds here.

Preserving

To save the seeds for planting next summer, store dried (not roasted) seeds in a brown paper bag. They’ll remain viable for up to seven years!

If you plan to eat most of your seeds, here are a few important points to remember:

  • Raw, unshelled seeds can last in the pantry for 2-3 months, or in the fridge or freezer for up to one year
  • Roasted, shelled seeds last for 3-4 months in the pantry, and up to a year in the fridge or freezer
  • Roasted, unshelled seeds last for 4-5 months in the pantry, and for a year in the fridge or freezer

Recipes and Cooking Ideas

Sunflower seeds aren’t just good for snacks!

A close up of a dinner plate with a roasted chicken breast covered in a fresh green pesto, and a side dish of potatoes, set on a wooden surface with a knife and fork to the right of the frame.
Photo by Meghan Yager.

They make an incredible pesto, like you’ll find in this spinach and sunflower seed pesto grilled chicken recipe from our sister site, Foodal.

You can also use the seeds to make a healthier breading for fried chicken, as in this Foodal recipe.

A close up of a white ceramic plate with healthy chicken fingers coated and roasted with a baking pan and other utensils in soft focus in the background.
Photo by Kelli McGrane.

Seriously, how delicious do those chicken fingers look?

The tasty seeds are filled with iron, protein, vitamin E, fiber, and zinc, so they’re nutritious any way you choose to enjoy them.

Quick Reference Growing Guide

Plant Type: Annual Flower / Foliage Color: Usually yellow, can be red; green
Native To: North America Tolerance: Light frost
Hardiness (USDA Zone): 2-11 Soil Type: Organically-rich, loose
Bloom Time / Season: Spring, summer, early fall Soil pH: 6.0-7.5
Exposure: Full sun Soil Drainage: Well-draining
Spacing: 2-12 inches, depending on variety Attracts: Bees, beneficial pollinators, birds
Planting Depth: 1 inch (seeds) Companion Planting: Squash, tomatoes, lavender
Height: 1-12 feet Avoid Planting With: Potatoes
Spread: 3-6 feet Family: Asteraceae
Water Needs: Low to moderate Genus: Helianthus
Maintenance: Low Species: annuus
Pests & Diseases: Cutworms, grasshoppers, headclipping weevils, sunflower beetles; alternaria blight, phoma black stem, phomopsis stem canker, rhizopus head rot, rust, white mold

A Sun Worshipper to Turn Every Head

Whether you like to gaze at their beauty or eat their delicious seeds, sunflowers are a treat to grow. If you have a red house like I do, they’re pretty much a yearly must-have for the front flower beds.

Have you ever grown sunflowers? What was your favorite part about the process? Let us know in the comments below and feel free to share your pictures!

And for more information about growing edible flowers in your garden, check out these articles next:


Don’t forget to Pin It!

A collage of photos showing sunflowers in bloom.

Photos by Kelli McGrane, Laura Melchor, and Meghan Yager © Ask the Experts, LLC. ALL RIGHTS RESERVED. See our TOS for more details. Originally published September 10, 2014. Updated and revised May 14, 2020. Product photos via Arbico Organics, Burpee, Eden Brothers, and True Leaf Market. Uncredited photos: Shutterstock.

About Laura Melchor

Laura Melchor grew up helping her mom in the garden in Montana, and as an adult she’s brought her cold-weather gardening skills with her to her home in Alaska. She’s especially proud of the flowerbeds she and her three-year-old son built with rocks dug up from their little Alaska homestead. As a freelance writer, she contributes to several websites and blogs across the web. Laura also writes novels and holds an MFA in writing from Vermont College of Fine Arts.

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diane
diane (@guest_8470)
4 months ago

thank you for the great information.