Yes! It was printed on seed paper and should sprout into wild flowers. Place your invitation on soil that is slightly compressed, but not too hard-packed. Add 1/8 inch of soil on top of the paper and give it a good drink of water. After that, make sure it's always moist and in a sunny spot. You should see sprouts within 7-10 days!
If when you RSVP (on this website), it says “and Guest,” then yes, if not, we would prefer if it was just you.
Semi-casual, please. We want you to feel comfortable, so we're thinking nicer than sweats; but you might feel out of place in a formal gown.