"The pattern represents the flower as it is when the seeds have formed and the inner petals have become lighter in color. Thus a distinct pattern is framed in a darker tone," she wrote in explanation of the block. And that was all she had to say about the Sunflower block.
However, you can see her pattern here which has a little more written on it than she wrote in today's article which once again makes me believe she wrote about this pattern more than once. She wrote her column daily for many years which means well over a thousand columns so I think it's likely that she repeated some of the blocks. Time will tell!
Since this is an applique block, I did not make it.
A Sunflower quilt made according to her pattern might look like this-
Nancy's Sunflower block can be found in Electric Quilt's Blockbase program as #3459.