Garden pebbles and riverstones transform ordinary outdoor spaces into low-maintenance, high-impact landscapes. Whether you’re creating a modern pathway, a dry creek bed, a weed-free border, or simply refreshing tired garden beds, laying pebbles correctly makes the difference between a professional finish that lasts years and a messy surface that shifts, weeds, or sinks.
This practical guide walks you through the full process used by New Zealand landscapers, tailored for the climate and conditions we experience across the Bay of Plenty and beyond. It draws on proven methods and the range of premium riverstones available at Gardenscape Landscape Supplies.
Why Choose Garden Pebbles?
Decorative pebbles offer several practical advantages over mulch or bare soil:
- Excellent weed suppression when installed over quality weedmat
- Superior drainage that prevents waterlogging and reduces mud
- Long-lasting colour and texture that won’t break down like organic mulch
- Moisture retention around plant roots while keeping the surface clean
- A modern, architectural look that complements both contemporary and native NZ plantings
Popular choices include the smooth grey tones of Rio Grey riverstone (available in 20mm, 40mm and larger grades), the warm gold and ochre mix of Desert Gold, the multi-tonal marble-like Ohau Fine pebbles, and the crisp Scandi-style Southern White. Each brings a distinct character while performing the same core functions.
Choosing the Right Pebbles for Your Project
Match the stone size and colour to the job:
- 20mm grades (Rio Grey Fine, Desert Gold Fine, Ohau Fine) – Ideal for pathways, narrow borders, pot toppers and high-definition modern looks. Recommended depth: 30–40 mm.
- 40mm grades – Better for larger beds, rockeries and borders where you want more visual weight and stability against wind or leaf blowers. Recommended depth: 50–60 mm.
- 60–80mm and larger – Perfect for feature areas, dry creek beds, pond surrounds and bold architectural statements. Recommended depth: 80–100 mm.
Consider traffic levels too. Smooth rounded riverstones look beautiful but can shift slightly under heavy foot traffic. For high-use paths, pair them with solid edging and a stable base. Gardenscape stocks these grades in both bagged quantities for small jobs and bulk cubic metres for larger projects, with pickup or delivery available across Tauranga, Papamoa and the wider region.
Tools and Materials You’ll Need
Gather everything before you start:
- Measuring tape, string line or marking paint
- Spade, shovel and rake
- Wheelbarrow
- Plate compactor or hand tamper (for larger areas or base layers)
- Quality non-woven weedmat
- 150mm steel ground staples (far superior to plastic pegs in NZ soils)
- Garden edging (concrete, timber, steel or stone)
- Optional: GAP 7 crusher dust or GAP 20 for a firm sub-base on soft ground or high-traffic paths
- Gloves and sturdy footwear
Having the right materials on hand prevents half-finished jobs and ensures a clean result.
Step-by-Step: How to Lay Garden Pebbles Properly
1. Plan and Mark the Area
Sketch the space and decide on depth and finished height. Mark boundaries with string, spray paint or temporary edging. Account for any slope so water drains away from buildings and seating areas. Measure the square metres accurately — this determines how much stone you’ll need.
2. Clear and Excavate
Remove all grass, weeds, roots and debris. Dig down to the required depth: typically 50–80 mm total for light decorative beds (allowing for weedmat + pebble depth), or deeper (100–150 mm) if you’re adding a compacted sub-base for paths. Dispose of vegetation properly — don’t bury it under the new surface.
Level the soil with a rake. Fill low spots and scrape high points. Lightly compact the soil so it doesn’t settle unevenly later.
3. Install Edging
Edging keeps pebbles contained and gives a crisp professional finish. Options include Gardenscape concrete garden edging (charcoal or natural), timber sleepers, steel, or larger feature stones. Install it firmly so the top sits slightly above the final pebble height. This prevents migration and creates a clean transition to lawn or paving.
4. Add a Sub-Base (Recommended for Paths and Soft Ground)
On soft or clay soils, or where people will walk regularly, spread 40–70 mm of GAP 20 or GAP 7. Compact thoroughly in layers. This creates a stable platform, improves drainage, and stops the pebbles sinking into the soil over time. Skip this step only for purely decorative, low-traffic beds on firm ground.
5. Lay Weedmat
Roll out high-quality non-woven landscape fabric. Overlap seams by 150–200 mm (more in areas with aggressive weeds like Kikuyu). Secure every 500–800 mm with 150mm steel ground staples, paying special attention to edges and seams. Cut neat X-shaped slits where existing plants will remain, folding the flaps under.
Weedmat is essential in New Zealand conditions. It blocks light to suppress weeds while allowing water and air to pass through, and it stops your expensive pebbles from mixing with soil. For additional expert guidance on using landscape fabric under gravel and pebbles, the Royal Horticultural Society offers clear advice in their gravel gardens guide.
6. Spread the Pebbles
Tip the pebbles in small piles rather than dumping everything in one spot. Start at the far end of the area and work backwards so you don’t walk on the finished surface. Rake evenly from multiple directions to the recommended depth for your chosen grade. Aim for complete coverage with no fabric showing through.
For a more settled look, lightly tamp or walk the surface (or use a roller on larger areas). Hose the stones lightly to remove dust and reveal their true colour.
7. Finishing Touches
Check for thin spots and top up as needed. Sweep any stray stones off edging or paving. Step back and assess the overall level and coverage. Around plants, keep pebbles a little clear of stems to allow airflow.
How Much Do You Need? Quick Coverage Guide
As a rough rule:
- 1 m³ of 20mm pebbles covers approximately 25–30 m² at 30–40 mm depth
- 1 m³ of 40mm pebbles covers roughly 16–20 m² at 50–60 mm depth
Always order a little extra (10–15%) for uneven ground, settling and future top-ups. Gardenscape staff can help calculate exact quantities based on your measurements.
Maintenance Tips for Long-Lasting Results
Once laid correctly, pebble surfaces require minimal upkeep:
- Rake occasionally to redistribute any shifted stones
- Remove leaves and debris before they break down
- Top up thin areas every few years
- Avoid high-pressure water that can displace smaller grades
- For sloping sites, consider a permeable binder like Landscape Lock if movement becomes an issue
Common Mistakes to Avoid
- Skipping weedmat — leads to weeds and muddy stones
- Insufficient depth — looks sparse and allows fabric to show
- No edging — stones migrate into lawns and paths
- Poor compaction of the base — results in sinking and uneven surfaces
- Walking on unfinished areas — creates ruts that are hard to correct
Take the time to prepare properly and the finished result will look professional for years with almost no ongoing work.
Ready to Start Your Project?
Laying garden pebbles is one of the most satisfying DIY landscaping projects. With the right preparation, quality materials and a methodical approach, you can achieve a clean, durable, low-maintenance finish that elevates your entire outdoor space.
Visit Gardenscape’s landscape supply yard to view the full range of Rio Grey, Desert Gold, Ohau, Southern White and other premium riverstones in person. Our team can advise on the best grade and quantity for your specific project, supply professional-grade weedmat and steel staples, and arrange convenient pickup or delivery.
Start planning your pebble project today and enjoy a beautiful, weed-free garden surface that looks good in every season.