Next to Apex Peakway at Highway 55, at Beaver Creek Lake, there is at least one corn plant growing next to a field of weeds (wild plants). And next to the lake itself is a squash plant? Out in Arizona, I learned that there is a practice of guerrilla gardening, where one drops seeds, seemingly randomly on property that is not yours, but is not otherwise being used. Then one can casually cultivate the crop without attracting attention.
Here's one site on the topic of Guerrilla Gardening.