Garden Soil in Pennsylvania: Filling Beds on Heavy Plateau Ground

Out on the western plateau hills, the soil that comes with the house is mostly silt and clay weathered off shale and siltstone, sitting on slopes that cut away into steep little valleys. Dig a vegetable bed into that and you get a bathtub: the sides hold water, the middle stays cold into May, and the roots of anything you plant sit in it. That is why most garden soil ordered in this part of the state goes into beds built up above the existing ground rather than into holes dug down into it.

What the compost changes next to screened topsoil

Garden soil is a nutrient-enriched blend with organic compost worked into it, put together as a growing medium rather than as a general-purpose soil. The compost is what separates it from the alternatives, holding moisture through a dry August while still letting excess water pass through after a thunderstorm, and feeding the soil organisms that turn organic matter into something roots can use.

Three products on this site look interchangeable on a delivery note and are not.

The mistake that costs the most is using fill dirt or subsoil to raise a bed and then capping it with two inches of the good stuff. Roots run out of the cap in a single season and hit the dead layer below.

New beds, tired beds and the strip where nothing ever took

The blend earns its keep in three situations on a hillside lot. First, filling new raised beds and planters, where you are building the growing medium from nothing and the depth of it is the whole future of the bed. Second, refreshing an established bed that has slumped and gone tired after a few seasons, which is a top dressing job. Third, replacing the material in a border or planting strip where the existing ground is compacted builder's leavings and nothing has ever grown properly.

Where it does not belong is anywhere structural. Compost-rich material keeps breaking down, keeps losing volume and holds water, so it has no business under anything you intend to build on.

Depth for a raised bed, a top dressing and a bare border

Give a raised bed as much depth as the frame allows, and think in root runs. Salad, herbs and shallow-rooted flowers manage in six to eight inches of good medium. Tomatoes, peppers, squash and most perennials want a foot or more, and root crops want depth that is loose all the way down rather than soil sitting on a compacted pan. If the frame is deep, the usual approach is coarse material or existing soil in the bottom third and the blend filling the rest.

For refreshing an existing bed, two to three inches spread over the surface is the figure the calculator guide and the live product information both point to, worked lightly into the top of the existing soil rather than tilled deep. For a bare border being rebuilt, six inches gives most bedding plants what they need if the ground beneath has been broken up first.

New fill settles. Reckon on losing a little depth over the first few weeks and after the first heavy rain, and fill slightly proud of the frame.

Where garden soil goes around a pole barn, a gravel drive and a flagstone walk

The same property usually has three jobs happening at once, and only some of the soil on the order is garden soil.

Around a new pole barn or equipment pad. The pad itself takes compacted stone, not soil of any kind. What garden soil does out there is fill the planting bed along the sunny side of the building once the pad is finished and the grade is settled.

Along a single-car gravel drive. The drive gets 2A Modified and a surface course. The two-foot strip either side of it, where mower wheels drop and grass never establishes, takes a shallow run of blended soil and reseeding.

Beside a flagstone walkway. The walk is set on a compacted base with Screenings bedding. The border it runs through is where this product goes, deep enough to plant into rather than a scattering over the rubble left from construction.

Cubic yards for two 4 by 12 beds and a 30 foot border

All figures are hypothetical. Square feet times depth in feet, divided by 27, gives cubic yards. This site publishes blended garden soil at about 2,000 lb per cubic yard, which is exactly 1.00 ton per yard and makes the conversion unusually easy.

Read the other way, a cubic yard tops dress about 162 square feet at 2 inches and fills roughly 27 square feet at a foot deep. Round bed orders up rather than down, because settling and the odd container always take more than the arithmetic says. The soil calculator carries the same weight figure and will take several beds at once.

Ordering into the planting window on the western hills

Timing matters more for soil than for stone. Hillside ground here stays wet and soft through early spring, and a loaded truck crossing a saturated lawn does damage that outlasts the garden. Once the ground has dried, beds can be filled from spring through autumn, and a fall fill gives the material a winter to settle before planting.

Choose the quantity and the delivery date on this page, with delivery arranged at checkout by ZIP code and the truck needing a firm spot with room to reverse. Ask for the drop on the drive rather than the lawn, have a tarp down if the pile has to sit, and move it within a few days so the grass underneath survives. Anything unusual about access goes to Pennsylvania Rock Supply through Contact before you book.