Growing Sunflower

helianthus annuus : Asteraceae / the daisy family

Jan F M A M J J A S O N Dec
        P P            

(Best months for growing Sunflower in USA - Zone 5a regions)

  • P = Sow seed
  • Sow in garden. Sow seed at a depth approximately three times the diameter of the seed. Best planted at soil temperatures between 50°F and 86°F. (Show °C/cm)
  • Space plants: 8 - 18 inches apart
  • Harvest in 10-11 weeks.
  • Compatible with (can grow beside): Cucumbers, Melons, Sweetcorn, Squash
  • Avoid growing close to: Potatoes

Your comments and tips

Post a comment or question Display Newest first | Oldest first, Show comments for USA | for all countries
12 Sep 23, Anonymous (USA - Zone 7a climate)
I live in Northern California mountains. Zone 7a. Can I allow mammoth sunflower seeds to drop in fall to winterize before spring?
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14 Sep 23, Anonymous (USA - Zone 8b climate)
Maybe you would pick them and store them.
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10 Oct 23, Kathleen (USA - Zone 4a climate)
Not sure if Im in zone 4a or 4b (Ossipee, NH). When should I plant sunflower seeds?
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05 Dec 23, nancy aldape (USA - Zone 9a climate)
I love sunflowers
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02 Jan 24, Celeste Archer (Canada - Zone 5a Temperate Warm Summer climate)
Me too.
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Showing 31 - 35 of 35 comments
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I’m planting mammoth sunflower in zone 9b (FL). I started the seeds in containers and moved them to the ground. For some flowers, I dug holes and filled with garden soil. For others, I planted in the ground, which is sandy. Those seem to be doing okay, too. They get sun from sunrise to sundown. Would you plant them in sandy soil?

- Marjorie

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This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. Gardenate is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
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