Horticultural/Agricultural systems modeled on ecological relationships.
Permaculture is the concept of designing an agricultural (or horticultural) system based on ecological relationships found in nature, rather than modern agriculture which tends to be based primarily on strict biological requirements. Permaculture aims to create a stable system that is virtually self-sustaining. Contrast this with modern agriculture which often results in erosion, soil degradation, and can depend on significant fertilizer and pesticide treatments.
The field of permaculture has significant overlap with concepts such as organic farming, sustainable development, and applied ecology.
Use this tag for questions about permaculture - how to practice it, and how to make your approach more "permacultural".