Eli5 Why are weeds so hard to kill while desirable plants so hard to keep alive?

Question

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?

In: 61

Answer 1

If you want the realest answer, its because weeds are often the native flora and are thus ideally suited to the soil conditions, whereas your invasive grass and flowering plant species need constant care and attention to stay alive, let alone thrive, because they are alien to the area.