The popular online advisor, Dr. Axe, posted a good article about the use of Lemon Verbena. He's got medical research to back up his 5 Health Benefits of Lemon Verbena. That part is excellent!
But his infographic called Growing and Harvesting Lemon Verbena contains a mistake. Planting Lemon Verbena seeds is not going to bring you success in a reasonable period of time. You need to buy a live plant or learn to propagate cuttings from a live plants. That's the best way to get started.
Don't buy seeds from anyone on the internet! When your live plant produces seeds, feel free to collect and dry them. Then you can experiment with starting Lemon Verbena from your own seeds, and my guess is you'll agree with me. Starting plants from seeds is not the best way to get more Lemon Verbena plants.