Trees best suited for a permaculture garden are those that are not only drought-resistant and hardy but also carry out multiple functions such as providing food, shelter, and aiding in the garden’s overall ecosystem. Here are some of the top choices:

1.Fruit Trees: Apple, pear, cherry, and plum trees are great for providing fresh fruits and can create a canopy layer that supports understory plants and increases biodiversity. They can also offer shade to more sun-sensitive plants.

2.Nitrogen Fixers: These are essential to naturally increasing soil fertility. Examples include alders, certain acacias, and locusts like the honey locust or black locust. These trees fix nitrogen in the soil, which helps other plants grow.

3.Nuts: Hazelnut (Corylus) and walnuts (Juglans) have a dual purpose offering both a food source and contributing to the structure of the garden with their branching habits that can provide shelter to wildlife and other plants.

4.Support Species: Fast-growing support species such as bamboo can be used for stakes or to make trellises. They often grow quickly, providing shelter and a microclimate for developing systems.

5.Edible Perennials: Mulberry trees are perennial providers of food as well as leaf fodder for animals like chickens.

6.Dynamic Accumulators: Trees like comfrey can draw up nutrients from deep within the soil making them available to shallower-rooting plants when they shed their leaves.

By incorporating these types of trees into your permaculture garden framework, you’ll not only create a self-sustaining ecosystem but also a source of nourishment and natural utility substances that reinforces the overall permaculture design principles.