Nat's wedding bouquet was lifted by some turd at our wedding, so as a surprise, her mom re-created the bouquet for her as a gift. One of the flowers in the original bouquet was an Anemone - but for some reason the florist needed to have Nat's mom secure non-cut versions of the plants. I think she lopped off the blooms/buds and then was left with a few plants without buds. So...we took one home and planted it - thinking that there was no way it would come back. Didn't even give it much thought.
But then this summer...guess what? It started going nuts. It is really quite pretty and has grown very big and strong. This one should be around for many years to come.