Shredded Mulch in Pennsylvania: Choosing It Over the Alternatives

On the southeastern Piedmont the uplands weather to a loam off schist and gneiss, the lowlands run to red shale, and beds bake hard by August after a wet spring has already crusted them over. The decision most people are making in March is not what mulch is. It is whether to put mulch down again this year or switch the bed to stone and stop thinking about it. Shredded mulch is shredded hardwood, natural brown, in a consistent medium shred, and the case for it comes down to what it does to the soil underneath rather than to how it looks on the day.

Hardwood shreds, rounded stone or a fresh layer of soil

Three covers, three different jobs.

Shredded hardwood shades the ground, cuts evaporation, keeps light off weed seed and breaks down into the soil over a season or two. That breakdown is the point on Piedmont ground, where a clay-influenced bed benefits from organic matter working into it. It is also the drawback, because it has to be renewed.

River Rock does not break down and never gets renewed, but it feeds nothing back into the bed and turns any future replanting into an afternoon of picking stone out of soil. Garden Soil is not a cover at all: it is what goes into a bed, and a tired bed sometimes needs that instead of another layer on top.

The split is simple enough. Mulch for anything you plant in and change, stone for anything you want to leave alone for years.

Why shreds knit on a sloped schist loam bank

Shredded material has a fibrous character that nuggets and chips do not. The strands catch on one another, so on a slope a shredded cover mats together and holds where a chunkier product floats off with the first heavy summer storm. That matters on the Piedmont, where storm runoff off built-up ground is what scours beds and washes covers into the lawn. On a bank, lay it thinner than you would on flat ground, water it in, and let it knit before a storm tests it.

The same fibrous character is why mulch on flat clay can mat too thickly and shed water instead of letting it through. That is a depth problem, and the next section deals with it.

Beds, tree rings and foundation strips through a southeastern summer

The jobs it suits around here are the ones that get worked.

Planting beds and borders, where the cover goes between plants and gets disturbed every time something is divided. Tree rings, where mulch keeps mower and trimmer away from the trunk and holds moisture through a dry August. Foundation strips, where a soft cover is easier to lift than stone whenever something needs access. Erosion control on a shallow bank is fair as long as the flow is sheet runoff rather than a channel, because where water has a defined route the mulch will be at the bottom of the garden by morning.

Playground use is one to be careful with. Hardwood shreds are used as a play surface in some settings, but a fall surface is a rated product with a specified depth, and the description here covers a landscape mulch rather than a certified play material. Treat this listing as bed and border cover.

Two to four inches, and what happens on either side of it

The listing gives a typical depth of a 2 to 4 inch layer, and both ends of that are there for a reason.

Under two inches the cover does very little: light reaches the soil, weed seed germinates, and the bed dries out much as it would bare. Over four inches the problems start, because a thick mat holds water at the surface and sheds it away from roots, and mulch banked against a trunk holds moisture where a plant does not want it. Pull a tree ring clear of the trunk rather than piling it up.

Three inches is where most beds sit, closer to two on a slope or on heavy ground. Renewal is a top-up rather than a replacement: turn what is there with a fork in spring and add an inch, and the color comes back without building depth year after year.

The barn pad, the drive and the flagstone walk want stone, not shredded mulch

Three jobs land on this listing every spring and all three are stone orders.

A pole barn or equipment pad carries weight. That is a compacted base of 2A Modified, with #57 Stone as the open layer under a slab. Mulch belongs in the beds around the building, not under it.

A single-car gravel driveway is a base and a surface. Build on modified stone and finish with Driveway Gravel. Mulch will not carry a tire and a drive full of it is a mud bath by the second week.

A flagstone walkway is bedded, not covered. The stones sit on a screeded course of Screenings over a compacted base. Mulch has a role beside the walk, in the planting pockets and the border strip, and nowhere in the structure.

Cubic yards for a 60 foot border and two tree rings

Hypothetical examples. Square feet times depth in feet, divided by 27. Mulch is ordered by the cubic yard on this site, so the yardage column is the number you need. For reference, the calculator pages put shredded mulch at about 600 lb per cubic yard, roughly 0.30 tons, so it is a light load for its bulk.

A 6 foot circle is 3.14 times 3 squared, which is 28.3 square feet. One cubic yard covers about 108 square feet at 3 inches or about 162 at 2 inches. The mulch calculator will run your own bed dimensions, and curved borders are easiest measured along the center line and treated as a straight strip of that length.

Picking a yardage and a drop spot for a light, bulky load

Mulch weighs a fraction of what the same volume of stone weighs, which sounds convenient and is not the whole story. It takes up exactly the same room, so a pile is big, and wind and rain will both move it where a stone pile stays put.

Pick a drop spot on hard standing close to the beds, with room for the truck to pull clear and nothing overhead. A tarp under the pile makes the last of it easy to sweep off a drive, and one over it stops it blowing if the load sits for a day or two. Choose the yardage and the delivery date on this page. Delivery is arranged at checkout by ZIP code, and a tight or narrow approach is worth flagging through Contact before the date is set.