I have noticed that in my allotment, Weeds in the regularly Weeded beds are actually evolving! They are growing thinner stalks, so that when you attempt to pull them the "tops" come away leaving the roots still firmly implanted, to regenerate. They are also evolving "brains", I have also noticed that in order to help protect themselves, they will grow as close to a Vegetable as possible and inter-twine their roots! so if you pull the weed you lose the Veg! makes it uneconomic to disturb them - very cunning!!
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