Answer:
I am flora, not fauna. I am foliage, not trees. I am shrubbery, not grass. What am I?
I can be hairy and itchy all over. I can be the scariest thing you have ever seen. I stand in the middle of nowhere, hanging on a stick. What am I?
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen. What am I?
I go through a door but never go in and never come out.
You use a knife to slice my head and weep beside me when I am dead.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?