Lemon balm is super easy to propagate you don't even need rooting hormone just cut off 6 to 8 inches or so just below a node and snip away the lower leaves then place in a glass of water in a sunny window. In a few weeks or sooner you will see tiny little roots starting to grow once the roots are a few inches they are ready to transplant.
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Thanks @jetjockey! Yes lemon balm is a great plant to propagate! Just like mint, it grows as a runner as is super duper hardy. Once you have some established, it really loves to spread! Sharing it with friends and family who want to plant their own gardens is a great use for it when it's time to prune it back, because as you point out it's so easy to start.