Don't have a lot of space in your backyard or house to plant useful vegetation? Utilize your garage! With a simple space heater (for some of those colder months) you can acheive a lush, garden of various plants in the wasted storage space a garage can sometimes provide.
I've seen many use their garages for parking their cars and storing many boxes, work out equipment, decorations, etc., but why not use the space for a potential money-saving hobby such as gardening? Not only can you grow things to sell during the winter months (which restaurants and grocery stores pay extra for, during that season), but you also avoid bringing pests and bugs in with your plants.
Got annoying alergies that linger with your plant collection? Move it into the garage! My additional advice is to gauge how cold your garage gets during the winter months. If you live in the midwest, where temperatures can drop below zero, you will not be able to make such a transition. But if you live in an area with more moderate winters, you are fully capable of moving the garden into the garage.
Of course this idea also means making an investment in growth lighting, but such capital will be a worthwhile investment considering how much you'll save the first year on your vegetables!