For this activity, all you need is a number of flat, smooth stones and a permanent magic marker or enamel pen. 
Rocks come in all manner of lovely, natural colors to enhance any garden’s décor. (And those worn smooth in a stream or river won’t tear up the tip of the marker.) Good rock candidates shouldn’t be hard to come by. Check with your local rock yard and pick through the lot for some cool options, or search the banks of nearby streams and rivers. 
Next, bring your rocks to a washtub and scrub them clean. You’ll want to make sure to remove all dirt and debris so your writing stays intact and doesn’t flake off with the dirt. Once they’re dry, simply write the plant names directly on the rocks. If you use a permanent marker to write on the stones, you’ll need to refresh the letters every couple of years. If you use an enamel pen, your writing should last for years on end. (Just be sure to use light-colored markers on dark rocks and dark ink on the lighter ones.) 
Then just place each marker in the appropriate spot in your garden. It doesn’t get much easier than that! These stone markers are inexpensive, easy to create and won’t get tossed around your yard by the elements. Best of all, they’re lovely natural additions to your garden – making them the true rock stars of home-landscape plant labeling!​