Sunflowers are a popular garden flower that can provide a cheery burst of color during the summer months Their bright yellow petals and tall stalks make them stand out Many gardeners enjoy growing sunflowers but wonder if they need to replant them annually. The answer depends on whether you are growing annual or perennial sunflower varieties.
Annual vs. Perennial Sunflowers
There are two main types of sunflowers
-
Annual sunflowers – These complete their entire lifecycle in one growing season. They bloom set seed, and die in the same year they are planted. To have annual sunflowers again the next year you need to replant the seeds.
-
Perennial sunflowers – These live for multiple years. They might not bloom the first year after being planted, but they will come back and flower every year after that without having to be replanted.
And that’s it! If you plant annual sunflowers, you’ll have to plant the seeds again every spring to get flowers again. But with perennials, the same plants will come back year after year.
Differences Between Annual and Perennial Sunflowers
Annual and perennial sunflowers have some key differences in their growth habits and characteristics:
-
Blooming – Annual sunflowers bloom the same year they are planted as seeds. Perennials take at least two years to bloom.
-
Seed heads – Annuals can have large, showy seed heads. Perennials have only small seed heads.
-
Root system – Annuals have shallow, stringy roots. Perennials develop deep tubers and rhizomes.
-
Growth rate – Annual sunflowers grow quickly after germination. Perennials are slower growing.
-
Reseeding – Annuals rely on reseeding to propagate. Perennials spread via tubers and rhizomes primarily.
-
Seed production – Annuals put energy into producing many large seeds. Perennials have fewer, smaller seeds.
-
Growth habit – Annuals grow a single tall stem. Perennials produce multiple shorter stems in a clump.
Popular Varieties
Some of the most popular annual sunflower varieties that need replanting each year include:
-
Mammoth – Grows up to 12 feet tall with giant seed heads.
-
Sunburst – Multi-branched type with bright yellow and red bi-color blooms.
-
Autumn Beauty – Beautiful mix of fall tones including orange and burgundy.
-
Teddy Bear – A dwarf variety that grows only 2-3 feet tall.
-
American Giant – Can reach up to 15 feet tall!
Some perennial varieties that will come back annually include:
-
Maximilian Sunflower – Pale yellow flowers that bloom profusely.
-
Giant Sunflower – Grows up to 9 feet tall.
-
Ashy Sunflower – Compact at 2-3 feet tall with bright yellow blooms.
-
Sawtooth Sunflower – Bright yellow petals and sawtooth shaped leaves.
-
Early Sunflower – Blooms very early in the season.
Growing Tips
Here are some tips for successfully growing both annual and perennial sunflower varieties:
-
Give them full sun exposure for at least 6 hours daily.
-
Plant annuals from seed after danger of frost has passed.
-
Space plants 12-24 inches apart depending on variety height.
-
Water weekly until established, then water only during droughts.
-
Stake tall varieties to prevent stem breakage.
-
Deadhead spent blooms to encourage more flowers.
-
For perennials, cut plants back in fall and mulch roots for winter.
-
Divide crowded clumps of perennials in spring every 2-3 years.
-
Turn crop rotation for annuals to prevent pests and diseases.
Annual sunflowers will put on a colorful show all summer long if you take good care of them. And perennial types can give you years of happy, bright flowers with little work. Just know what kind you are growing to see if you need to replant every year or not.
Ashy Sunflower
:max_bytes(150000):strip_icc()/Gettys-1412002994-261f650772c6406ca02422d8548a72b9.jpg)
In July through September, the Ashy sunflower (Helianthus mollis) blooms. It is a small sunflower that grows to be 2 to 3 feet tall. It is native to the central and southeastern United States. Plant in USDA zones 4-10.
Perennial Sunflower Varieties
There are more than 52 species of sunflowers, and all of them are native to North America and Mexico. There are also many perennial varieties. Planting a naturally occurring variety in your area has the most benefits for local insect populations, biodiversity, and wildlife.
Perennial sunflowers won’t bloom until the second year, but once they become established, they are low-maintenance plants. You can count on a sunflower patch or drift to bloom for years to come because they spread by rhizomes, seeds, or both.
Here are some popular perennial sunflower species:
How to harvest, save and store sunflower seeds ready to plant next year.
FAQ
Is sunflower annual or perennial?
Sunflowers can be either annual or perennial. Most sunflowers that are grown for their flowers or seeds are annuals, which means they only live for one year.
What do you do with sunflower plants at the end of the season?
After making a clean cut to the stalk, place them in vases or containers filled with room-temperature water. You can support large blooms with floral sticks and wire, or choose a vessel that supports the long stems. Cut sunflowers should last a week or longer indoors.
What is the lifespan of a sunflower?
The lifespan of a sunflower, from planting to death, is typically around 12-16 weeks (3-4 months). This includes the stages of germination, vegetative growth, reproduction, blooming, and finally, senescence where the plant deteriorates and dies.
Will sunflowers come back on their own?
Sunflowers are either an annual (where they need to be replanted every year) or a perennial (where they will come back every year from the same plant) and telling the difference is not that hard if you know how. Jun 17, 2021.
Do you need to re-plant annual sunflowers?
Annuals, on the other hand, will only bloom once. If you want to keep seeing their beauty, you will have to replant them. Annual sunflowers will typically be labeled as Helianthus annuus, but if you would like to purchase seeds and are unsure, it would be best to consult your local gardening expert.
Do sunflowers come back every year?
Whether sunflowers come back every year depends on the variety. The sunflower genus Helianthus has both annual and perennial species. If you plant a perennial variety, you’ll be happy to see new sunflowers the next growing season. Here’s what you need to know about the differences between the two kinds.
Can a sunflower grow back a year without replanting?
On the other hand, perennial sunflowers, also known as Helianthus multiflorus, can grow back every year without replanting. They won’t die back completely and will return the following year from the same plant. Perennial sunflowers are a great choice if you want to have sunflowers in your garden without the hassle of replanting every year.
Should you plant a perennial or a annual Sunflower?
If you plant a perennial variety, you’ll have new sunflowers the next growing season. Here’s what you need to know about the differences between the two kinds. And if you cannot decide which type to grow and you have the space, plant both. You can never have enough sunflowers—and pollinators and birds love them, too.
Do sunflowers bloom every year?
Blooms – Annual sunflowers will bloom the first year after being planted from seeds, but perennial sunflowers grown from seed will not bloom for at least two years. Roots – Perennial sunflowers will have tubers and rhizomes attached to their roots, but annual sunflowers just have the typical string-like roots.
Can you grow annual sunflowers from seed?
Annual sunflowers come in many varieties, primarily hybrids, meaning their seeds won’t produce a plant true to type. If you want to have the same sunflowers next year, you’ll need to purchase fresh seeds from a seed company every year. Annual sunflowers are typically planted directly in the garden from seed.