I believe you will love the cardboard. It makes for a pretty good sponge when it rains, an insulation layer when it's dry, and worms love it. Once the worms get to it, the beneficial bacteria left behind multiply and catalyze the composting-in-place process.Meanwhile, plants with roots below the cardboard tie all the stuff together down under. Any weeds that start up high can be pulled right out of the wood chips with ease.
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