Rootzone Soil, Topsoil or Screened Garden Soil: Which One Does Your Garden Actually Need?

If you’re laying turf, use rootzone. For levelling, filling or building up ground on a landscaping project, use screened topsoil. For borders, raised beds and planting, reach for screened garden soil. Each is engineered for a different job, and choosing correctly is the difference between a lawn that thrives and one that struggles from day one.

The three look similar in the bag, so it’s no surprise this is one of the most common questions we’re asked before an order goes out. Below, we’ve broken down what each soil type does, when to use it, and roughly how much you’ll need. If you’re still unsure once you’ve read through, our team is only a phone call away.

What is rootzone soil, and why is it different from topsoil?

Rootzone is a specialist growing medium built for one purpose: giving new turf and grass the perfect surface to establish in. The key difference between rootzone and topsoil is the sand content. Rootzone carries a high sand fraction blended with a controlled amount of organic matter, which gives it the free-draining structure that young roots need.

That improved drainage matters more than most people expect. When you lay turf onto heavy, water-retaining ground, the roots sit wet, knit slowly and are far more prone to disease. A rootzone layer drains excess water away while still holding enough moisture and essential nutrients for strong roots to drive down quickly.

Here’s the rule of thumb we give every customer asking what soil for laying turf works best: for turfing, always start with rootzone. It’s the single biggest factor in how fast your new lawn establishes and how well it performs in its first season.

Our rootzone soil for turfing across Scotland is screened, consistent batch to batch, and blended specifically for our Scottish growing conditions. It’s the same base we rely on across our own 300 acres, and it pairs naturally with our turf rolls, delivered or available for click and collect.

Use rootzone for: laying new turf, over-seeding and top dressing an existing lawn to level minor dips.

When should you use screened topsoil instead?

Screened topsoil is your general-purpose workhorse. Where rootzone is a specialist product for the top layer of soil under grass, topsoil is what you use to level ground, fill low areas, and build up depth before any planting or turfing begins.

Screening is the important word. Our topsoil is passed through a screen to remove stones, roots and debris, leaving a clean, workable material that spreads evenly. Just as importantly, our screened topsoil contains no recycled material and is greenfield sourced, so you know exactly what’s going onto your site.

For anyone specifying materials on a commercial contract, our topsoil is produced to meet BS 3882:2015, the current British Standard for topsoils that are moved or traded. It’s worth knowing this is the fourth and current edition of the standard, so if a tender document references BS 3882 topsoil, this is the specification it means.

Topsoil is also the right base for seeding. If you’re establishing a lawn from grass seed rather than turf, a screened soil for seeding gives you a fine, even surface with the nutrient-rich structure young grass needs to germinate.

Use topsoil for: levelling, filling and building depth on general landscaping projects, and as a seedbed for grass seed.

What is screened garden soil used for, and when does it beat both?

Screened garden soil, sometimes sold as bedding soil, is built for growing plants rather than grass. It’s a finer, more nutrient-rich blend intended for borders, raised beds and planting areas where roots need a soft, fertile medium to spread into.

The distinction between screened topsoil vs garden soil comes down to fineness and purpose. Our garden soil is passed through a 20mm screen, which keeps fine stone content low and produces a smooth, crumbly texture that’s easy to plant into. That finer grade is exactly what you want when filling flower beds or topping up an existing bed, where a coarse fill would fight against delicate roots.

If you’re building screened garden soil into borders and raised beds in Scotland, this is the product to choose. It suits ornamental planting, and if you plan to grow vegetables, its higher organic matter and balanced fertility give crops a stronger start than a general fill would.

Please note that garden soil is not a substitute for rootzone under turf. Its finer, more moisture-holding structure is a strength in a raised bed but a weakness beneath grass, where drainage is king.

Use garden soil for: borders, flower beds, raised beds and planting areas, including where you grow vegetables.

Side-by-side comparison: the one-minute decision guide

If you only remember one thing, make it this. Match the job to the soil, and you’ll rarely go wrong.

Turf means rootzone, landscaping and levelling mean topsoil, and planting means garden soil.

How much soil do I need for my project?

This is where most pre-purchase hesitation happens, so let’s make it simple. Every soil job comes down to one calculation:

Length (m) × Width (m) × Depth (m) = volume in cubic metres

Once you know your area and the depth you’re working to, you know your volume. As a guide to depth for different soil types:

1. Rootzone under turf: around 25mm is standard for a level, prepared surface, up to 50mm where you’re correcting minor dips.
2. Topsoil for levelling: varies by site, but budget for the depth you need to reach a firm, even finish once consolidated.
3. Garden soil for beds: fill to planting depth. Borders often need 150mm or more, and raised beds for growing vegetables benefit from 300mm or deeper.

For rootzone soil coverage as a worked example: our rootzone covers roughly 18m² at a 25mm depth per bag, which is about 0.45 cubic metres of material. Double your depth to 50mm, and that same bag covers around 9m².

For bulk topsoil, coverage depends on the bag volume, so check the figure listed on the product page and divide it by your working depth. Our garden soil is sold in 25kg and 35kg bags, which are ideal for topping up beds and borders rather than large-scale fills.

A note for the Turffit team: please confirm the current per-bag coverage figures for topsoil bulk bags and the 25kg/35kg garden soil bags against the live product pages before publishing, so the numbers match exactly.

If you’re working out turf and rootzone quantities together, our turf calculator does the area maths for you. And if a project is large or awkwardly shaped, call us with your dimensions, and we’ll help you order the right amount first time.

Can I mix rootzone and topsoil under turf?

We don’t recommend it. It’s a question we hear often, usually from people trying to stretch a smaller rootzone order across a bigger area, but mixing the two undermines the reason rootzone works in the first place.

The high sand content in rootzone is what delivers the drainage and root growth that new turf depends on. Blend it with topsoil, and you dilute that structure, ending up with a layer that drains inconsistently and establishes unevenly. The result is patchy knitting and a lawn that never quite settles.

If budget is the concern, the better approach is to use screened topsoil to build up and level your base, then finish with a clean layer of rootzone as the top surface for your turf. That gives you the depth you need without compromising the growing layer the grass actually roots into.

For the full method, our guide on how to lay garden turf walks through ground preparation step by step, and our turf laying service is available if you’d rather we handled it.

Matching the soil to the job

To recap the whole decision in one place:

• Laying turf? Rootzone, every time. It’s the best soil for a new lawn in Scotland because of its drainage and root-friendly structure.
• Levelling, filling or building depth? Screened topsoil, greenfield sourced and produced to BS 3882:2015.
• Borders, flower beds or raised beds? Screened garden soil, fine, nutrient-rich and easy to plant into.
• Don’t mix rootzone and topsoil beneath turf. Build your base with topsoil, finish with a clean rootzone layer.

Get the soil right and everything on top of it, whether turf, seed or planting, has the best possible start.

Ready to Get Your Project Started?

A lawn worth looking at doesn’t grow overnight, but with the right turf, it gets there faster than you’d think. Grown across 300 acres of fertile Scottish land near Loch Leven, Turffit has been supplying premium, Turf Growers Association-certified turf to homeowners, golf courses, sports pitches, and commercial landscapers across the UK for over 25 years. From garden transformations to large-scale groundworks, our expert team is ready to help you get it right. Claim your free consultation and quote today; call 01592 869 000. Find us at Levenmouth Steadings, Scotlandwell, Kinross.