Sometimes recommended as ground cover for dry shade. The stems root wherever they touch the soil so it spreads like fury. I have the variegated form, which is prettier but does try my patience sometimes.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Might have to remove or at least try and control so would be nice to know what it is?
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They're not that deep but if you cut off the foliage, you can see what you're doing.