This idea is all over the gardening webs but here is my visual interpretation. Thanks to Kim for photography and to Mike for my new oregano plant.
I find most Gardeners and Plant Lovers to be very sharing, very giving. They have snippers in hand ready to cut off a tip to share, harvest seeds, or dig up plant babies to pass around. Identifying little cuttings as they grow into big plants is difficult sometimes because the ID tags wear off, the Ink washes off or gets rubbed off or the tags simply get lost. While this idea won't help you from losing your plant ID tags, this will help you keep the identity of your precious growing plant start for a long time.
All you need are some empty, washed aluminum cans, a pair of scissors and a ball point pen.
Step 1: 1) Pierce the can at the top and bottom.
1) I used small kiddie scissors because that was all that was around but I think long, adult-size scissors would work. Use the point and pierce a hole in the sides of the can to separate the bottom and the top. Today's soda and beer cans are not your Grandma's cans. Aluminum cans are thin these days. They are easy to pierce, easy to cut. I did not wear gloves at all but if you feel more comfortable wearing them go for it. The cut-can edges can be sharp and there will be shards of aluminum flying during this project so protect your area.
Step 2: Cut the top and bottom off.
2) Carefully cut around the bottom and remove the top and bottom of the can. Because it is round, the cut will not be straight and perfect. Some of the metal will curl. Be careful! Discard the top and bottom or find some other use for them. (?)