When growing tomatoes people suggest you remove the suckers that grow at the elbow of the plant. I did this early this summer, but instead of tossing the suckers, I put them in a small glass of water. Slowly they developed threadlike roots. When the roots were hardier, I planted them in the garden and these were the tomatoes that I am harvesting now. Some look like babies in blankets.
Wow! That is a great idea! Makes perfect sense too! They are little plants waiting to grow! You can multiple your garden cheaply this way! Genius!