Few of us today really know what we eat. This is because most of the food we eat is bought on impulse — or near impulse — weekly or even daily as we need it. Even adding together what you buy now won’t necessarily tell you what you may decide to eat home grown. Peaches are expensive — but we feed the surplus to our geese. That means we don’t buy goose food — or any number of ‘cheaper’ alternatives to peaches and cream for dessert.
If you want a ‘self sufficient ‘ garden you need to be able to look at your garden. Work out different ways of using space. Backyard Self-Sufficiency is the necessary book to get it started.