[In this case, it's only one-way; Apollo only needed to let Blake hear something that he otherwise couldn't, and assumed that Blake wouldn't have anything to say that couldn't be spoken out loud, so he didn't ask Solrock for two-way communication.

There's definitely some mild confusion coming from Apollo though.]

You just heard what it had to say. It's not the same kind of talking and feeling as humans do, but it's still talking and feeling.

[And the answer to that question is "yes". The moss can indeed feel things, just less than the tree.]