Celest, where are you located? Can you partner with another agency to get the word out?
For example, I teach at Oakhurst Gardens. They are an excellent partner for gardening/education and leadership in Atlanta. Master Gardeners groups and extension offices are another wonderful resource.
You need to find a place that has a website that you can advertise on. I'm wondering if Walter Reeves could also help you via his radio show or perhaps the Farmers and Consumers newspaper?

Also, if there's an Agriculture program, 4-H or FFA at any of your local schools, talk to the teachers involved in those programs. Ask a school principal for permission to come give a presentation. Is it strictly Horticulture, or would you consider other garden-related majors like Landscape Architecture or even Botany?

We're down in Sharpsburg ... south of the airport. Actually, anything to do with gardening is acceptable.

We're down in Sharpsburg ... south of the airport. Actually, anything to do with gardening is acceptable.