Hardwood vs softwood mulch: which one belongs in your garden beds

Hardwood bark mulch lasts 2--4 years, resists compaction, and is appropriate for most ornamental beds including mixed perennial borders. Softwood mulch (usually pine) breaks down faster, acidifies soil slightly, and is the right choice for acid-loving plants like blueberries, aza

Walk into any landscape supply yard and you'll find both hardwood and softwood mulch. Sometimes the yard labels them; sometimes you're just looking at a brown pile and a reddish pile and guessing. The difference matters because these two materials behave differently in soil — one breaks down faster and acidifies more, the other lasts longer and is more neutral.

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What makes a mulch "hardwood" or "softwood"

The terms refer to the botanical classification of the source tree:

Hardwood comes from deciduous broadleaf trees: oak, maple, hickory, cherry, ash. Hardwood bark and wood chips have dense cell structure, higher lignin content, and resist decomposition longer.

Softwood comes from conifers: pine, fir, spruce, cedar. Pine bark and pine straw bale are the most common softwood mulches. Cedar is also technically a softwood, though it behaves somewhat differently due to its natural oils.

Per Penn State Extension, "hardwood mulches generally persist longer in the landscape because of their higher lignin content and denser wood structure compared to softwood species."