Thank you, I had an inkling it could be that, as we do get them in the garden, but have never noticed them growing so prolific - or at this time of year.
Thank you for your replies, I have done some thinning out, otherwise the rockery would be just covered in them - nice though they are when they flower 🙂
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.