Shredded hardwood bark mulch is made from 100% tree bark, and not ground up wood.  Therefore it contains a great deal more nutrition for your plants and as it decomposes it greatly improves the soil in your gardens.  When the logs of hardwood trees are arrive at the saw mill one of the first things that happens is the logs are put through a de-barking machine and all of bark is removed from the logs before they are cut into lumber.

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The bark is the shredded and often times it’s shredded two or three times.  That’s what they mean when they say double or triple ground.  But the most important thing for you to know is to confirm that you are indeed buying mulch that is made 100% from hardwood bark.