If they are out of sight or don't bother you, try to alter your mindset and view them as lovely green foliage. If you want to see butterflies, and who doesn't? you have to have caterpillars and they need wild plants for their survival
If they're similar to our thorny Canadian Thistle here in the U.S., one needs to dig them up to the bottom of its root so as to prevent regrowth next spring. We can't pull them unless the soil is very damp since they break off at ground level…
Clanad, thankfully they're not as bad as that. I read somewhere that they provide food for insects and birds and thought that's as good a reason as any to leave them. One less chore to do.
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