Today I harvested my sunflowers. They were planted along the fence in front, to provide color for folks looking up or down the block. I had not planned to harvest the seeds, but there were so many that the prospect of free sunflower seeds became very compelling.
Here is the product:
I think there may be enough seeds for myself and about 20 of my closest friends. If you are local and want some seeds, let me know. There are bright yellow and pale yellow, and I know which is which. Both grew to about 6 feet. I don't know if the seeds will grow true.
Here is a close-up on one of the largest heads. Note the many interlocking spirals: