Activity for Private User

Dude. Invitations and postage are expensive. Can we get away with sending email invites to those who have email, and sending printed invitations to the grandparents (who don't have email)? Is this a disaster waiting to happen? Is it tacky? Printed...

I'd like to use just native wildflowers and grasses for my wedding flowers, and I'm toying with the idea of growing them myself. My main concern is that my wedding will be in the middle of July, and I'm not sure which flowers, if any, in a wildflower...