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(Theun: I disagree with much of this; in my opinion Ecosystem_gardening is much less anthropocentric than suggested here and has nothing to do with growing crops. The tribals we met in India, living in stone-age conditions, had little knowledge about plants beyond their use. Human pressures simply never were high enough to need any management. And lastly being in the rainforest for just a few weeks made me quiet sure that its metabolism is way beyond our capacity to prune and weed it. In fact you can't even keep it from invading your body. I'd like to add that research done by Willie Smits on Borneo has shown Orang-utans to use pruning and weeding and sowing. )