What is your so-called elevator speech for this product?
As RogerL indicated, the site does need a lot of work. But, I think a deeper problem is that I don't really see a clear business model here. I see something that looks like this type of thinking: "1) make app 2) talk to vendors 3) (something happens here 4) Profit!" and I will suggest that vendors at farmer's markets are not there to try to make you rich. You have got to offer something of value to them.
Best of luck.