To be self-sustaining for one person indefinitely, the size of your garden and the number and types of plants you'll need will depend on several factors, such as your location, climate, soil type, and dietary preferences. Here are some general guidelines to get you started:

First, determine your caloric needs based on your age, gender, activity level, and any health conditions. The average adult requires around 2000-2500 calories per day, but this can vary depending on individual factors.

Next, choose high-yield, nutrient-dense plants that can provide a variety of vitamins, minerals, and macronutrients. Some examples include potatoes, sweet potatoes, beans, peas, squash, tomatoes, peppers, lettuce, kale, spinach, and fruit trees like apples and citrus.

To calculate the number of plants you'll need, use a gardening tool or app to estimate the yield of each crop per square foot or meter of garden space. For example, one tomato plant can yield up to 20 pounds of fruit, while a 10-foot row of beans can produce up to 10-15 pounds.

Based on your caloric needs and the estimated yield of each crop, you can calculate how much garden space you'll need to provide enough food for one person indefinitely. A general rule of thumb is that you'll need around 200-400 square feet of garden space per person, depending on your dietary preferences and gardening skills.

Keep in mind that growing your own food requires time, effort, and resources, so it's important to start small and gradually expand your garden as you gain experience and confidence. You may also want to consider preserving or storing excess produce for long-term use, such as canning, drying, or freezing.

I hope this helps get you started on your journey towards self-sustainability through gardening. Let me know if you have any more questions or need further assistance!
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