What do weeds do differently than other plants that lets them grow so quickly?

Question

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?

In: 121

Answer 1

My botany professor said a weed is any plant growing where a human being doesn’t it want to grow.