Verticle Mulching Techniques?

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The method I'm familiar with is using a 2" auger to drill holes about 12" deep in a 3'x3' grid pattern underneath the canopy of the tree and then backfilling with sand or peatmoss. There are other methods using an airspade and radial trenching and then backfilling with a soil compost mix. That is probably more beneficial to the tree, but I've never done it personally.
 

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