Weeds grow, well, like weeds, out of the cracks of the pavement with nothing but municipal runoff to keep them alive. Meanwhile I have to work tirelessly to keep my tomato and pepper plants happy and fruitful. Why do weeds dominate a garden?
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As others said weeds are often better adapted to your specific environment. And some weeds are nitrogen fixers that can grow in terrible soil conditions. Also worth noting is that in agriculture or in your garden you are applying a selective pressure. You pull the weeds by hand for example, then the weed that can survive that will thrive better because it might have a deep root that grows back, or a rhizome that doesn’t come up when pulled. In essence the weeds that are easy you can get rid of but the ones that are left are those with an adaptation against your applied methods. Try to get rid of Purple Sedge, it has both a tuber to grow back from and fixes nitrogen. That makes it a very very difficult weed to control without chemicals.
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