As an exercise, let?s apply the four elements of the classical world ? earth, air, fire and water ? to the garden. Earth comes first, because you certainly can?t grow much without soil. You?ll also need air in that soil or plant roots will decay and soil organisms will perish. And not much survives, or thrives, without water.
The need for fire is a little less obvious. Though dangerous, it can be a major regenerative force in forests and grasslands. And it can also be a major ally in the war on weeds.
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Source: http://feeds.washingtonpost.com/click.phdo?i=09ccc6f9c76d7998c8c6b16a7c04732b
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