I'm not looking to get rich, but enjoy gardening and growing plants and would like to make a little extra money.
Sounds good. Doing what you enjoy, and getting others to pay for your hobby.
I have seen dozens selling via craig's list, and doubt if any of them have licenses.
Most government agencies are 'broke', and don't have the money to run around looking for somebody who might sell a dozen tomato plants every spring.
Sales will mostly be in the spring/early summer. Everybody wants new plants for their yard, but don't have the foresight to get set up to grow from seed in time for planting time. I know people who basically finance their hobby by selling seedlings in 1-2 months each spring.