/diy/ - Do It Yourself

You're limited to square feet and want to minimize grocery store consumption. That means you need to think vertically and for volume. A garden box would be a good idea. You can concentrate good soil and keep weeds and pests out. Garden boxes can be made cheap out of pallets. Just make sure they're chemical free or, if chemical treated, isolated from the soil.

1.

Tomatoes are a natural choice. I put good, fertilized soil into the box pictured and used this string method:

https://youtu.be/l88Dg9iaD6s

They grew to six feet tall and produced an incredible amount of food. Buy cheap mason jars and lids, can the sauce, and you can have all you need for a year. Bonus points if you can some of it as other things such as salsa, marinara sauce, or chili.

2.

Look at vertical gardening. There are many cool things people build to take advantage of limited space. I don't have suggestions for cost efficiency since I haven't done it.