I just did a search for the word verbena and it brought up many different threads here. You may want to do the same to see if any of the threads discuss the use you have planned for it.

I was curious about this too, Lisa.

Nothing specific to infusing lemon verbena came up in my search here on the herb forum but imagine it is the same as these suggestions.

Looking for a recipe on the internet resulted in this. Once again, it isn't talking specifically about lemon verbena but the links near the bottom of the page will take you thru the next steps in soap making.

There's quite a bit of info on that site and it could take you a few hours of exploring. Hope it helps.

digitalSteve