Don't worry, we'll help you out.
Gardening is a mystery in certain aspects, but think of it this way? What if you planted to survive?
Some people still plant actual food in their gardens and eat directly from their patches, which means you know exactly what went into growing said foods. Did you use pesticides? Where was it grown? All of these things you can cultivate yourself!
Here's some great food that you can grow, and what seasons they thrive in - that way you're not killing the fruits of your labor... Pun intended.
According to Thompson-Morgan, you can plant Onion seeds in the fall and they will be there to harvest by Summer. That means it goes through a full winter, so the only thing you have to be careful is that you made sure to mark the spot you planted them, because once you start planting anything for Spring, you don't want to dig them up.