It is a good idea! Thieves, pls don't search my yard for pinecones! Here's a good idea to hide your extra house key - put it in a medicine bottle, glue a pinecone or rock on top, stick the bottle in the yard or planter.
If you plan to hide a #geocache like this, make sure you do not hurt the tree; remember you can not damage trees to make a cache. You do not need much to replicate this hide, only a piece of branch, a hole in a tree, a container and a screw. Make sure to use the same type of branch as the tree or else it will be too obvious.
Stash Cash in the Door? - 15 Secret Hiding Places That Will Fool Even the Smartest Burglar. you know until you put it all over the Internet and then everyone and their mother knows you have secret hiding places.