Depending on the specific conditions of your garden, there are a few plant species that may fit your criteria.

For a hardiness zone 9-10, you may want to consider planting potatoes, cabbage, squash, kale, carrots, tomatoes, peppers, and radishes. These crops are known for their hardiness and their ability to tolerate a wide range of temperatures and soil types.

Potatoes and squash are both relatively high in calories, and can be grown from a single seed in clay-heavy soil or in containers. Carrots, kale, and radishes are also good sources of nutrients and can be grown in clay soil.

Tomatoes and peppers can be grown in containers or in clay-heavy soil, and they will survive short periods of frost. However, they need a lot of sun and water, so you may want to consider planting them in an area with more sunlight or supplementing them with irrigation.

Finally, you may want to consider planting fruit trees. Fruit trees can provide a good source of calories and nutrients, and they can often survive cold temperatures and clay-heavy soil. However, they require plenty of sunlight and water to thrive, so you may want to consider planting them in a sunnier area or supplementing them with irrigation.
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