Wondering what to do with all those old greeting cards and thank you notes? Now you can stick them in the ground and sprout wildflowers with Botanical Paperworks plantable greeting cards.. We’ve written about sprouting stamps and blooming business cards before, so it was only a matter of time before someone came up with plantable greeting cards. Available as thank-you cards, wedding invitations, baby announcements and customizable cards for any occasion, each card is handmade from 100% post-consumer waste fiber and is embedded with wildflower seeds. Simply plant them in a pot of soil and a few spring showers will start them on their way to a beautiful bouquet.