I wasn’t clever enough to root any of my own. I bought a plant from either shumway or jungs last spring. Put it in the biggest pot I had and it very nearly filled it by the end of the growing season. It’s in my garage right now. I might separate it next year but I need to read up on that first, lemongrass might take offense to that.
Let me know what you find out about propogating them, as I said, I'm clueless.
/johnny
I saw a youtube of an Australian (?) guy who divided his lemon grass just like you’d divide anything else. Separate the roots and put 2-3 plants into small pots (he was potting it up to sell) and give them haircuts. Eventually they ended up in 5 gallon buckets. Rinse and repeat.