Easy-to-Grow Plants: Sunflowers, Big Flowers With Large Seeds

Updated on July 15, 2019
Beth Eaglescliffe profile image

Friends say I have "green-fingers," and the garden certainly seems to respond to my efforts. I enjoy watching wildlife and being outdoors.

A field of sunflowers (Helianthus annuus).
A field of sunflowers (Helianthus annuus). | Source

Watch, Water, and Enjoy

Growing sunflowers (Helianthus annuus) is a good choice for beginner gardeners. The flowers are huge and the seeds are nice and big, making them easy to sow. The stem and leaves grow fast, so you will quickly see the result of your efforts.

Sunflower plants need regular watering and plenty of sunshine. A sunflower’s daily growth spurt is noticeable, and it can be fun to measure its increasing height every day. You will experience a real sense of satisfaction when the buds open up to reveal enormous flower heads. They are an annual plant and will flower in August.

Sunflowers brighten up your garden and attract birds and insects to your yard. The seed heads are also harvested for human food, producing both a tasty vegan snack food and delicious low-cholesterol sunflower seed oil.

I recommend you plant Seed Needs, Salt N' Roast Sunflower, as the seeds are very large for easy planting. Make sure you buy fresh seeds that are intended for this year’s crop. There should be a plant-by or use-by date on the seed packet. If you have older seeds, they can still be planted, but their ability to germinate will be reduced.

When to Plant Sunflower Seeds

The timing for outdoor planting depends upon where you live. For best results, daytime temperatures should be at least 60°F (16°C). You must also wait until the likelihood of overnight frost has disappeared.

You can cheat nature a little by planting your sunflower seeds under glass. You can use either a green-house or a garden cold frame. Sheltering the ground like this warms it up and means you can plant a month ahead of normal.

When Is Soil Warm Enough for Sunflowers?

Planting Sunflowers
Under Glass
Outdoors
Month in which to plant (Northern hemisphere)
April onwards
End of May
Outside temperature
n/a
at least 60°F (16°C) and no night frosts
Distance apart
2 inches and then "prick out" as seedlings
18 inches

How to Plant Sunflower Seeds

My favorite sunflowers are single stem, single large flower variety. I plant them towards the end of May directly in the ground where I want them to flower. I plant them at least 18 inches apart. This gives enough space for their large flower heads. They normally grow to a height of 6 to 8 feet. They grow best where they get a lot of sunshine, but not somewhere so hot that they get scorched.

If you intend to plant yours under glass in April, you can plant three seeds to each large plant pot. When the seedlings are 4 inches tall, you can prick them out into their final flowering positions outdoors. "Pricking out" means you remove them from the flowerpots and replant them in their final flowering positions 18 inches apart in your flowerbeds.

Sunflowers Turn to Face the Sun

When I first started to grow sunflowers, I planted them next to a fence, thinking they would automatically face towards my house. This was true only for as long as the stems were short enough for the fence to block direct sunlight. Once the plants got to the top of my fence, however, their flower heads turned to face the sun, which in my case was away from my house. My lucky neighbor got all the benefit of my hard work.

It was a tough lesson to learn. So, make sure you think about the direction of the sun and plan your planting accordingly if you want to avoid my mistake.

RHS Recommended Plants For Kids

The Royal Horticultural Society (RHS) recommends sunflowers as an ideal plant for kids to grow and care for. They give the following tips.

  • When choosing a packet of sunflower seeds, remember to look to see how tall it might grow.
  • Sunflowers can be sown straight in to the ground where they are going to flower, so make sure the space you are going to sow is weed free.
  • Don’t forget to water the seeds. As they grow, if the plants are crowded, thin them out to about 45 cm apart, leaving the strongest, tallest plants.
  • Slugs and snails like to eat the new shoots. You may like to protect the plants by cutting the top off a plastic bottle and placing it over your seedlings.

The sun's rays peep out from behind large seed-heads.
The sun's rays peep out from behind large seed-heads. | Source

Tallest Sunflower Competitions

Because sunflowers are so easy to grow, they are often used for competitions. The contests are fun to enter, and you’re likely to meet some friendly green-fingered people. Check out your local agricultural or village shows for tallest sunflower contests.

If there isn’t already a competition nearby, why not start one yourself? Local schools and playgroups could get kids interested in the environment by running one. Growing sunflowers is a great activity for children. The large individual seeds are easy for small, clumsy fingers to hold. Once planted, sunflowers grow very quickly, so kids enjoy checking a plant’s growth spurt each day.

The tallest sunflower measures 9.17 m (30 ft 1 in) and was grown by Hans-Peter Schiffer in Karst, Nordrhein Westfalen, Germany, as verified on 28 August 2014.

— Guinness World Records

Have you ever entered a tallest sunflower competition?

See results
Could this one be tall enough to win a tallest sunflower competition?
Could this one be tall enough to win a tallest sunflower competition? | Source

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

Comments

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  • RTalloni profile image

    RTalloni 

    3 months ago from the short journey

    There's nothing much more fun than a sunflower. Grow a crop of them and whoa. :) A neat look at these delightful plants–thanks!

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