I've recently moved to a new house, which along with serveral other improvements over my old place, has a garden. I've "inherited" a 3x3 foot planter box thing to sit on the patio and I have space for a few more (probably 4 in total).
Now I'm sure somebody on here knows the answer to my questions: Can I grow veg in them? What types? How much?
Is everything seasonal or is it possible to plant/harvest some things on a kind of rolling basis?
I'm not expecting to go all The Good Life here, but it would be fun and satisfying to have on demand free food. When answering, please assume I know nothing about growing food/gardening other than the ability to identify the produce!