Serious question: How do you feel about the way plants are treated?

I'm an environmental studies major. I've read stuff that indicates that plants "scream" when harmed (emit a pulse which humans can't detect but which other plants can) and they also communicate to other plants about dangers in the area (such as insects chewing on them and harming them).

Curious as to how far you think we should take this stand against "speciesism". (EDIT: I mean, for example, should we protest that the sheep are stepping on and eating the grass? I'm sure the grass doesn't much appreciate it -- and, no, I am not being facetious.)