All Persicarias seem to love my garden and they are useful plants but take some watching. Firetail is relatively well behaved, expanding fairly slowly, P. bistorta with the AGM makes great swathes and seeds itself into new places and the runaway winner is P. campanulata with very different flowers, pretty, blousy pale pink and white and that one I swear if you stood and watched it for 10 minutes you'd see it moving! Fortunately they are all quite shallow rooted so easy to get out
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.