Here in our part of the north mulch and bark are two different things. Mulch is shredded wood and bark is chips of wood. Each is made from different types of wood like cyprus, cedar, pine, etc. Mulch decomposes faster and does not float away like bark seems to.
We have been putting down deep brown colored mulch around our home for many years and the color has never stained our driveway, walkway, etc. It fades (to a washed grey) but not as quickly as the pine straw. We only have to put a new topping on about every other year or so but that may have something to do with the northern climate versus Florida's.
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