I'm going to show this thread to my anemones (Frilly Knickers) as I want them to spread! But I suspect being near a beech hedge facing north is keeping them a bit too tame.
My Japanese Anemone were never very happy- white or pink. I thought it may have been too dry. They didn't grow much, let alone spread. I was worried by reports here of having difficulty to get rid of it, so I gave it away.
'Mind your own business' should have a health warning attached and shouldn't be sold willy nilly.
I think it depends both on your soil and the variety of Anemone. I have Honorine Jobert which is beautiful and well-behaved in our sandy loam but have had real problems for many years controlling the pink "September Charm", although it does look impressive en masse in late summer. Be very careful with Acanthus, as Stoner says. It has been a challenge for many years, actually breaking up concrete, and it grows from the tiniest piece left behind in the soil, like Japanese Anemones.
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