The size of a garden and the types and quantities of plants needed to achieve self-sustainability for one person indefinitely would depend on various factors, including the climate, soil quality, available space, and dietary preferences. However, here are some general guidelines to consider:

1. Garden Size: The size of the garden would depend on the growing conditions and the types of plants you plan to grow. As a rough estimate, you may need an acre or more of land to grow enough food to sustain one person indefinitely. This would allow you to grow a diverse range of crops, including grains, vegetables, fruits, and legumes, and have space for composting, water catchment, and other gardening practices.
2. Crop Diversity: To achieve self-sustainability, it's important to grow a diverse range of crops that can provide a balanced diet and meet your nutritional needs. This could include staple crops like grains (e.g., wheat, rice, corn), legumes (e.g., beans, lentils), and root vegetables (e.g., potatoes, carrots), as well as a variety of vegetables (e.g., tomatoes, peppers, cucumbers), fruits (e.g., apples, berries), and herbs. Consider growing both annual and perennial crops to ensure a continuous supply of food throughout the year.
3. Quantity of Plants: The quantity of each plant you would need to grow would depend on factors such as the yield per plant, the growing season, and your dietary requirements. It's important to research and understand the specific planting, growing, and harvesting requirements for each crop in your region to determine the appropriate quantity to grow. Consider factors such as plant spacing, fertility management, and pest control to optimize the yield of each crop.
4. Preservation and Storage: To sustain yourself indefinitely, you would need to consider preservation and storage methods for surplus produce. This could include canning, drying, freezing, fermenting, and root cellaring, among others, to ensure that you have enough food during non-growing seasons or for times when crop yields may be lower.
5. Livestock and Poultry: Depending on your dietary preferences, space availability, and local regulations, you may also consider raising livestock and poultry for meat, eggs, milk, and other animal products. This could complement your plant-based crops and provide additional sources of nutrition.
6. Sustainability Practices: To maintain self-sustainability in the long term, it's important to practice sustainable gardening methods, such as crop rotation, companion planting, soil conservation, and water management, among others. These practices can help improve soil fertility, reduce pests and diseases, and conserve resources for long-term sustainability.
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