Greetings!
Well, here it is February of 2022, and I just recently discovered this heartwarming project. I made two hearts for each of my grandchildren with a printout of the meaning and how-to and sent them for Valentine's Day. They can leave them about when they go on walks and hikes. I've left a couple myself, and my DH did too. I'm looking forward to making more. I think I will also tuck them into Christmas cards to friends with instructions about what to do with them. They're also good for just a bit of scrap-busting, including little bits of batting.
KalamaQuilts ~ I don't worry about our pacific northwest weather. The hearts won't be ruined by wet weather, and I printed the cards out and sealed them with plastic tape. I think they will survive fine until they are found.