Edit: The weed lobby is alive and well in the comments! Just kidding. Appreciate the responses.
But my question still sort of stands. Take away the pejorative label “weed”—what allows these plants to perform better than the other ones?
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They pick something where they are competitive. eg: they grow very flat and close to the ground and are so dense that other plants don’t have a chance to sprout. Any part of their roots will grow into another plant. They grow tall quickly amongst short stature plants or plants that grow slowly. They are not pleasant to eat for plant-eating animals, so the “good”, good-tasting plants get eaten. They have roots that exude something noxious that discourages growth of other plants. They tolerate an uncomfortable environmental situation where other plants do not (some plants can grow in highly salty soil).
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