I was just looking at my ‘sprawling’ lemon verbena yesterday morning & thinking next year, I should plan to make liqueur. I actually cut back some of the branches that were crowding my little lavender. Based on the amounts you gave, I would have plenty of leaves; however, the leaves aren’t as nice now because the plant is going into fall mode. The plant obviously liked the raised bed environment & did well, so I will plant again next year & plan on making liqueur.
Finding lemon verbena might not be easy - I ran across it at a nursery in the spring where we bought our first 4 Little Missy boxwoods. The Farm Bureau, Walmart & the country market just down the road (lots of flowers & some herbs) did not have lemon verbena.
It’s not easy to find, so I saved the tops of the plant to try to make starts for next year. I have no idea if that will work, but nothing ventured, nothing gained.
What else do you do with them except love that amazing aroma when you touch it? I have to look around for more ideas.