*Helianthus annuus*. New World annual noted for its large flowering head.

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What is the best sunflower for seed production in Pennsylvania zone 6b?

I have been growing mammoth grey stripe sunflowers for a while, but I want to know if there is a better producer for my climate. The area I would plant them in is a heavy, clay base soil. The average ...
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Are the seed pods of giant sunflowers normally empty?

So, I'm attempting to harvest sunflower seeds from some giant sunflowers I planted an age ago. Unfortunately, there's nothing inside the seed pods! I believe the sunflower was a 'giant', it may ...
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When should sunflower seeds be harvested?

I've got a few giant sunflowers that are hanging pretty low. I peeled off a few seeds around the outside just to see what they looked like and they look pretty big. They're fairly light though, not ...
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How do I provide support to a growing sunflower?

I am growing sunflowers and they grow quite high, sometimes toppling over. What kind of support can I give to them in this case?