Introduction
Not all topsoil is the same product. What’s sold as “topsoil” ranges from rich screened loam to barely-sorted subsoil with a marketing label — and the difference shows up in your lawn, your back, and your budget. This guide explains the grades, the blends, and what to check before you buy.
Once you know what you’re buying, get the quantity right with the Topsoil Calculator — the right material in the wrong amount is still a problem.
Screened vs Unscreened
The single most important quality distinction:
- Screened topsoil has been passed through a mesh — commonly 3/8 inch — that removes clods, roots, stones, and debris. It arrives uniform, spreads easily, and is ready to plant in. This is the default choice for lawns, garden beds, and raised planters.
- Unscreened topsoil skips that step. It’s cheaper per yard, but you’ll spend the savings (and then some) picking out debris by hand. Suitable only for rough filling, building up low areas under future turf, or sites where you’ll be screening or amending anyway.
Ask the supplier what screen size they use — “screened” without a size is vague, and some yards screen coarser than others. If possible, look at the pile before ordering. The pro tips guide covers how to inspect a load on arrival.
Topsoil, Fill Dirt, and Compost: Know the Difference
| Product | What it is | Use it for |
|---|---|---|
| Topsoil | The upper, organic-rich soil layer | Lawns, beds, planters — anything you plant in |
| Fill dirt | Subsoil with little organic matter | Raising grades, filling holes, under hardscaping |
| Compost | Decomposed organic matter | Amending soil, not replacing it — typically mixed in at 1–3 in |
| Blended mixes | Topsoil + compost and/or sand | Garden beds, lawns needing better drainage or fertility |
The expensive mistake is substituting fill dirt for topsoil to save money: it compacts hard, holds little nutrition, and the lawn or bed planted on it underperforms for years. Price differences exist for a reason — the cost guide breaks down what each grade typically costs.
What Good Topsoil Looks Like
You don’t need a lab to make a first-pass judgment. Good screened topsoil is:
- Dark brown to black — colour indicates organic matter. Pale, grey, or yellowish soil is usually low in organics.
- Crumbly — a squeezed handful forms a loose ball that breaks apart when poked. A slick rope that holds its shape signals excess clay; dust that won’t cohere signals excess sand.
- Earthy-smelling — a fresh, soil smell. Sour or rotten odours suggest anaerobic storage; the soil usually recovers with airing, but note it.
- Mostly debris-free — occasional small stones are normal in screened soil. Glass, plastic, large rubble, or weed-root mats are not.
Texture, Organic Matter, and pH
Texture
Ideal garden topsoil is a loam — a balance of sand, silt, and clay. Sandy soils drain fast but dry out; clay soils hold water but compact. If your supplier offers a sandy loam or a clay-loam blend, match it to your drainage: heavier soil for slopes that shed water, lighter soil for flat beds that pond.
Organic matter
Organic matter is what makes topsoil “top” soil — it holds nutrients and water while keeping structure open. Quality screened loam typically contains a few percent organic matter by weight; premium blended mixes with added compost run higher. If a supplier can’t say anything about organic content, that itself is information.
pH
Most lawns, vegetables, and ornamentals do well in soil with a pH roughly between 6.0 and 7.0 — slightly acidic to neutral. Outside that range, nutrient availability drops even when nutrients are present. A soil test is the only reliable way to know your number; don’t amend pH on guesswork.
Should You Get a Soil Test?
For any significant investment — a new lawn, a vegetable garden, several cubic yards of premium blend — yes. Basic tests through a local agricultural extension service or private lab are inexpensive and report pH, organic matter, and major nutrients. The test tells you whether the soil needs lime, sulphur, or fertilizer before you spread and plant — amending afterwards is always harder. For a single small raised bed filled with bagged garden soil, testing is usually overkill.
Questions to Ask Your Supplier
- Is it screened, and to what size?
- Where does it come from — is it true topsoil or a manufactured blend?
- What’s the organic matter content, approximately?
- What’s the bulk density (tons per yard) — relevant if delivery is weight-limited?
- Can I see the pile before I commit?
- What’s the delivery minimum, and what does the truck weigh loaded?
A supplier who answers these easily is usually a supplier worth buying from. Evasive answers on sourcing and screening are a red flag. More ordering strategy in the pro tips guide.
Related Guides
- Topsoil Calculator: The Complete Guide — volume math, worked examples, and terminology.
- Topsoil Calculator Cost Guide — what each grade typically costs, bulk vs bagged.
- Pro Tips — inspecting loads and ordering practices.
- Topsoil Calculator FAQ — quick answers to the most asked questions.
- Topsoil Project Checklist — everything to verify before the truck arrives.
Frequently Asked Questions
Is screened topsoil worth the extra cost?
For anything you’ll plant in directly — lawns, beds, planters — yes. The premium is modest per yard, and the labour saved by not picking debris out of unscreened soil exceeds it quickly.
Can I mix compost into topsoil?
Yes — blending 1–3 in (2.5–7.5 cm) of compost into the top layer is standard practice for garden beds. Some suppliers sell pre-blended mixes, which saves the mixing step.
How can I tell if topsoil is good quality?
Dark colour, crumbly texture, earthy smell, and minimal debris are the field checks. For certainty on pH and nutrients, get a soil test — appearance can’t tell you chemistry.
What’s the difference between topsoil and garden soil in bags?
Bagged “garden soil” is typically a manufactured blend — topsoil plus compost, peat, or bark — formulated for containers and beds. It’s more consistent than bulk topsoil but far more expensive per cubic yard.
Choose the Material, Then the Quantity
Decide what you’re buying before you decide how much: screened loam for planting, blends where fertility or drainage needs help, fill dirt only for structural filling. Then run your dimensions through the Topsoil Calculator and order the right product in the right amount.
Disclaimer: Calculator results are planning estimates based on the dimensions you enter. Soil quality varies by supplier and source; inspect material before accepting delivery. Verify quantities with your supplier and consult a qualified professional for grading, drainage, or structural decisions.
