a weed that takes over and strangles the life out of the things you're trying to grow may safely be considered devil's spawn! I don't know what 'crabgrass' specifically looks like, but there are voracious weeds the world over, and evil is usually one fo the milder descriptions used by anyone trying to cultivate.

whatever it is, it ain't grass!

if it were a person trying to take over the world and strangle the lifeblood out of all the other people around it one would definitely be able to call it immoral. Or Osama. As a plant it's kind of a grey area I guess, seeing as how plants don't apparently have morals that we've yet discovered. I guess it could politely be termed 'a survivor'!

Kerri.