Is it too late to vote?
Ã¢â‚¬Â¢Ã‚Â A 5ft square space *could* grow 6x6 block of corn.
Ã¢â‚¬Â¢Ã‚Â Have you ever tried Edamame (green soy beans)? Get the seeds specifically for early maturing Edamame varieties (75 days or so) and you should be in the clear. They need to be planted about 18" apart.
Ã¢â‚¬Â¢ Carrots (if you can keep the area moist until they sprout -- or you can use the cardboard trick)
Ã¢â‚¬Â¢Ã‚Â Nasturtiums (both flowers and leaves are edible -- tastes like black pepper)
Ã¢â‚¬Â¢ One or two bush variety summer squash or winter squash plants
Ã¢â‚¬Â¢ There's still time for early maturing variety melons
I'm going to try planting potatoes now for later crop. I have seeds potatoes that I forgot about in the fridge, but if you want to take the chance, you can use grocery store potatoes for seed potatoes as long as they're organic and not treated to suppress sprouting. Last year, I grew Russet, Yukon Gold, and Red boiling potatoes out of the pantry without any problems. It's just that grocery store potatoes are not certified to be disease-free like those sold as seed potatoes.