Congratulations on your success! I do not know what to add.
I think the fact that you are offering a nice, personal place for folks to buy their produce, or whatever else, is a plus, as against the large chain markets.
Are your customers, local residents, or folks "passing through"?
I agree with those who suggest signs, to advise motorists of what you have to offer. My only thought would be along the lines of something, that would let local folks know, too of your presence!
Even out here, in the land of many freeways, we have small local commnities (in suburbs) where surprisingly, even to myself, where regional farmers sell their produce.
Just around the corner, in nearby Fair Oaks, " Farmer Bob's" has his usual pumpkin patch and garden, a nice roadside stand in urban America. I tried to google to find a link. None.
And, not far north, is a huge market, Denio's of Rosevile. I am sure this is NOT what you are thinking, but it is just a comparison.
http://www.denios.org/ I wish you well and I know you are going in the right direction. Your personal touch and generous heart will make all the difference!!
For what it's worth...
ETA, and it is obvious, I am NOT a professional. I am just a customer.