An example of larger-scale Hügelkultur.

The gradual decay of wood is a consistent source of long-term nutrients for the plants. A large bed might give out a constant supply of nutrients for 20 years (or even longer if you use only hardwoods). The composting wood also generates heat, which should extend the growing season.

Avoid black walnut, pine, black locust, and redwood woods at all costs for this use.