The Japanese Anemone in our garden has become a rampant beauty. If I had a small field I'd plant a couple of these & let them fill the fields to there hearts content. The flowers have the silkiest, pink petals with a pearlescent glimmer - 'ark at me sounding all 'arty' - that sit like ballerina tutus on stems that are about 1m tall. They don't need support & at the end of its season will get the ol' chop back.
It sends shoots off underground but if you're careful enough, you can tease the shoots back to some fresh roots, yank it out & plant it elsewhere. I've got it dotted in all areas of the garden where the soils great & rubbish, sunny and dappled. If it gets a bit too much & tries to take over I just rips those bits out which does sound harsh so next year I may start potting them up to give to my clients.