I second what Murf said. Depending on the type of mulch will change your soils ph. If you use a Pine bark then of course your ph will head towards the acidic side and if you choose hardwood then the soils leans more toward the neutral or alkaline side. Some plants prefer soil with more acid and will actually suffer if the soil's ph raises much past neutral. I'm a landscape designer/owner and prefer mulch over pine straw as we call it in the south, because as it decomposes from the bottom side it amends and richens the soil, not to mention moisture retention, weed barrier, and cosmetics. There is a HUGE market for Pine Straw bails too.

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