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Really, Maggie? I could do with things that spread like mad. Muscari, liatris (! Well, I learn to live with it), my cyclamen are doing it, rhus is colonising one corner, but I draw the line at sycamore (my woodman observed that, come the end of the world, only sycamore and cockroaches will be left). I even have oaks that appeared from nowhere, courtesy of the local jays, all in the wrong place but spreading.. The more the merrier; beats a garden full of nettles any day !