In his book
Introduction to Permaculture (Tagari Publications, Australia, 1991), Bill Mollison defines permaculture as "a sustainable agricultural system based on a multi-crop of perennial trees, shrubs, herbs (vegetables and weeds), fungi, and root systems." He also calls it "a philosophy and an approach to land use which weaves together microclimate, annual and perennial plants, animals, soils, water management, and human needs into intricately connected, productive communities."
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