I love this flower! It has been growing in my gardens for two years, though I did not know it's name until I found your site. Also, the blue wisps that grow out from the center have never turned into petals. Still, it is mysterious and beautiful. Here in Ocala,Florida this flower does not like full sun; it likes diffused sunlight. Actually, it prefers to grow where it is a little cooler, like in the mountains of north Georgia.
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