WEEDS!

I spent some time weeding tonight, and though I am not a moron clueless of the art of pollination, I must ask myself where all the WEEDS in my garden come from?! How do they prosper in such numbers? Why don't my plants flourish in such a manner? What I've planted is doing well, but if the intended plants were prospering in the same ratio as the inevitable plants are, my tomatoes would be as tall as my garage.