This plant goes in my front yard in morning sun in the interior of British Columbia.
It has green leaves initially and then they curl brown and turn yellow. It gets water weekly but not lots. Is it okay to divide this plant to thin it out?
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It's a Japanese Anemone (Anemone hupehensis); if I had to guess, I'd guess it was the cultivar "Robustissima".
I used to grow these when I had gardens. Absolutely you can divide them! Wait until the spring if you can; if you have to divide in the fall, wait as long as you can to do so.