To me the whole idea of a raised bed is to fill it with something other than your existing soil, so it never needs to be tilled. You also use a good blend of ingredients so that it holds the proper amount of water.
For instance in Square Foot Gardening we use 1/3 peat moss, 1/3 coarse vermiculite and 1/3 blended compost (from 5+ sources). The first 2 ingredients hold water yet allow for good drainage and air space for roots to grow. The blended compost supplies all the nutrients your plants need so you don't need to use chemicals.
I have seen women looking at jewelry ads with a misty eye and one hand resting on the heart, and I only know what they're feeling because that's how I read the seed catalogs in January.
Barbara Kingsolver - Animal, Vegetable, Miracle
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