The beauty of perennials is that you don't have to replant each year. They save on labor, fertilizers, and cultivation. A properly designed perrenial garden is one of the most efficient and resiliant ways to grow your fruits and vegetables.
Forest gardening is an excellent way to maximise space and resources. Forests are highly productive, self-sustaining systems that require little in terms of management. It makes sense to design our food production systems based on those principles.