Planting and maintaining a garden to feed even one person year-round is a very difficult undertaking, and the short answer to your question is that it's complicated and will depend on your climate, time commitment, and other factors. Here are a few pointers to consider:

- **Available space** - Estimates vary one how much space you'll need for such a garden. Some experts estimate you'll need as much as 4000 square feet of space! Note that this estimate only includes planted soil area, and doesn't account for lanes between garden beds, equipment storage, etc.
- **Climate** - Consider the climate in which you'll be growing your garden. Choose plants that grow well in your region. 
- **Nutritional value** - Include plants that are nutritionally dense and produce high yields. This will help you to maximize your garden's efficiency. Some examples include corn, potatoes, and beans.
- **Variety** - Choose a variety of crops. This will make your garden more resilient and nutritious. Also make sure to plant enough varieties that you'll be satisfied with the choices - if you want to eat spices, for example, make sure to plant some. You probably don't want to survive on just potatoes indefinitely!
- **Replanting** - Some plants are genetically engineered such that they cannot be replanted. To be truly self-sufficient, be sure to choose breeds that you can replant.
- **Water** - You'll need to water your garden regularly, especially if you live in a dry climate. Consider where you'll get this water - will you purchase it from a utility company, pump it from a well, or something else?
- **Maintenance** - A garden that can sustain a person indefinitely is a massive undertaking that's not suitable if you are very busy or new to gardening. If you're not confident, consider starting with a smaller garden and working your way up to an undertaking of this size.

Note that these are just some pointers to consider, and you should consult a variety of sources before starting such an endeavor. Ideally, you may be able to find someone experienced in gardening or farming to get advice. It's also worth mentioning that lots of sources exist on the internet pertaining to this subject, which may be able to offer more practical advice. 

If you'd like to give me more information about your climate, the types of plants you'd like to grow, or your available resources, I'd be happy to provide more information relevant to your garden. If you have any further questions, feel free to ask!
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