Tomatoes are an interesting plant. They are notoriously difficult to grow from seed, but once you get them going they want to go. A curious property about tomatoes is that it any part of its stem system can become roots, meaning that you can theoretically snip off a tomato plant anywhere, put it in ideal conditions, and a new tomato plant will start growing.
So where is the best place to snip? The armpit. I don't know what this is called. I could look it up, but I won't. Basically, as you can see in the first photo, shoots will emerge from the armpit of a branch and the main stem. These shoots can be pinched off and collected in a cup of water until you start seeing a new root system emerge. After about a week, you'll be able to plant the new roots in moist soil and start a new tomato plant that will effectively emerge as a clone of your previous tomato plant and your garden will be full of tomato clones.
How to propagate free tomato plants from older plants: snip off the armpit shoots and put in water. pic.twitter.com/skIe3W5DlO
— Holly Wood (@girlziplocked) June 6, 2015
So where is the best place to snip? The armpit. I don't know what this is called. I could look it up, but I won't. Basically, as you can see in the first photo, shoots will emerge from the armpit of a branch and the main stem. These shoots can be pinched off and collected in a cup of water until you start seeing a new root system emerge. After about a week, you'll be able to plant the new roots in moist soil and start a new tomato plant that will effectively emerge as a clone of your previous tomato plant and your garden will be full of tomato clones.