You'd be hard pressed not to like this flower. It just screams happiness! The sight of a sunflower makes me smile without fail. I grew this one in my garden last year and then used the seeds from it to grow more this year. This one grew to about 3 metres tall whereas the ones I planted this year produced "baby" sunflowers which were barely a metre in height.
The flowers in the center of the head are called disk flowers. These mature into fruit (sunflower "seeds"). The disk flowers are arranged spirally. Typically, there are 34 spirals in one direction and 55 in the other; however, in a very large sunflower head there could be 89 in one direction and 144 in the other. This pattern produces the most efficient packing of seeds mathematically possible within the flower head.
Wikipedia
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