Walking into a landscape supply yard and asking for "garden soil" can get you five different answers — because garden soil is a broad category, not a specific product. Whether you're laying new turf, building raised garden beds or filling a planter, the soil or mix you choose will directly affect how well your plants grow.
At Martins Building & Landscape Supplies, we've been supplying Sydney home owners, landscapers and builders with the right soils and mixes since 1970. This guide explains what each product is, when to use it, and how much you're likely to need.
Garden Mix vs Topsoil: What's the Difference?
These two terms are often used interchangeably, but they're not the same product.
| Product | Composition | Best Use |
|---|---|---|
| Garden Fine Mix | Sand, soil, bark fines, ash, compost blend | New garden beds, shrubs, trees, general planting |
| Topsoil / Unscreened Soil | Natural soil, may contain coarse material | Levelling, fill, non-garden earthworks |
| Lawn Mix | Enriched organic blend | Lawn establishment and top-dressing |
| Turf Underlay | Sand and soil blend, free-draining | Base for new turf installations |
| Potting Mix | Lightweight, nutrient-rich, free-draining | Pots, planters and container gardens |
| Native Planting Mix | Low-phosphorus, free-draining organic blend | Australian native plants |
| Council Mix | Cost-effective blend | Large-scale civil, council-grade landscaping |
Which Soil Should I Use for Garden Beds?
For new garden beds — whether you're planting shrubs, ornamentals, natives or perennials — Fine Garden Soil Mix is the right choice. It's a blended mix of sand, soil, ash, bark fines and compost that provides good drainage, aeration and nutrient content for plant establishment. It's the closest product to what most people mean when they ask for "good garden soil."
Premium screened garden soil gives new plantings the best possible start.
Turf Underlay vs Lawn Mix: What's the Difference for New Turf?
Both products support turf and lawn, but they serve different stages.
- Turf Underlay / Natural Turf Underlay — a sand-and-soil blend designed as the base layer for new turf installations. It needs to be applied at 100–200mm depth before laying your turf rolls. Free-draining with good moisture retention.
- Lawn Mix — an enriched organic blend used for lawn establishment from seed or for top-dressing an existing lawn to fill hollows and encourage thicker growth.
How much soil do I need for a new lawn? For turf underlay at 100mm depth, multiply your lawn area in m² by 0.10. A 50m² lawn needs approximately 5 cubic metres of turf underlay. Our team can help confirm quantities before you order.
Can Garden Soil Be Used as Topsoil?
Garden mix can be used as a topsoil in garden beds, but it's more expensive than unscreened soil for non-planting applications. If you're filling behind a retaining wall, levelling a low spot in the yard or bulk-filling for earthworks, Unscreened Soil is the better value option. Reserve garden mix for beds where plants will actually grow.
What Soil to Use for Vegetable Gardens?
Veggie gardens need well-draining, nutrient-rich soil with a good organic content. Fine Garden Soil Mix is a solid base, but for raised vegetable beds, many gardeners combine it with a premium potting mix or add compost to improve fertility. Avoid using unscreened or fill soil in veggie gardens — it lacks the structure and nutrition plants need.
Australian Native Plants: Why They Need a Different Soil
Most Australian natives evolved in low-phosphorus, freely draining soils. Standard garden mixes with high compost content can cause phosphorus toxicity in sensitive native species. Native Planting Mix is specifically formulated with low phosphorus levels and excellent drainage to suit wattles, banksias, grevilleas and other Australian natives.
Related Products at Martins BLS
For soil improvement and composting guidance for Australian conditions, visit Royal Horticultural Society or ABC Gardening Australia for local expert tips.
Frequently Asked Questions: Garden Soil in Sydney
What is the best soil for a raised vegetable garden?
A blend of fine garden soil mix and premium potting mix is ideal for raised vegetable beds — it provides drainage, aeration and a good nutrient base. Avoid using unscreened or fill soil in vegetable gardens as it lacks the required organic content and structure.
Can I use garden soil as topsoil?
Garden mix can serve as a topsoil in planting areas, but for non-garden fill and levelling work, unscreened soil is more economical. Reserve garden mix for beds where plants will actively grow.
How much soil do I need for a garden bed?
Multiply your garden bed area in m² by the depth in metres. For a 10m² bed at 200mm deep, you'd need 2 cubic metres of soil. Our quantity calculator on the website can help you estimate this quickly.
What soil to use for garden beds?
Fine Garden Soil Mix is the best all-purpose choice for new garden beds. It's a blended mix of sand, soil, ash, bark fines and compost that provides good drainage and a nutrient base for most plants.
What is the difference between potting mix and garden soil?
Potting mix is a lightweight, free-draining blend designed for containers. It doesn't compact under irrigation the way in-ground soil can. Garden soil mix is denser, designed for in-ground beds where roots have room to spread. Using potting mix in the ground is wasteful; using garden soil in pots leads to poor drainage and root problems.
Is native planting mix different to garden mix?
Yes. Native planting mix is formulated with lower phosphorus levels and excellent drainage to suit Australian native plants, which are sensitive to excess phosphorus. Standard garden mix contains higher nutrient levels that can harm sensitive native species.
Do you deliver soil in bulk across Sydney?
Yes. Martins BLS delivers soils and garden mixes in 30L bags, bulk bags and loose tipped truck loads across Western Sydney, Parramatta, the Hills District, Penrith and surrounding areas. Call (02) 9651 1055 to arrange delivery.
Get the Right Soil for Your Sydney Garden
In stock and ready for delivery — from 30L bags to bulk truck loads, we have the soil and mixes your project needs.
