Simple, DIY Hacks to Prevent Mould Growth Under Artificial Turf

Warm sunshine mixed with unexpected bursts of rain creates the perfect conditions for unwanted mould to thrive beneath your synthetic lawn. 

Left unchecked, that hidden growth discolours artificial grass and can undermine hygiene and shorten the lifespan of your turf.

While synthetic turf eliminates many traditional lawn problems, it still requires smart care to remain pristine year-round.

In this guide, we’ll reveal the key factors behind mould formation, practical steps to improve drainage, cleaning routines that work in local conditions, and smart installation choices that help avoid future trouble. 

Artificial turf, also known as synthetic grass, is a surface made from man-made fibres designed to replicate the look and feel of natural grass.

Modern varieties incorporate UV-resistant materials, drainage layers, and infill systems that help maintain appearance and functionality over time.

Used in residential gardens, play areas, sports fields, and commercial landscapes, this alternative offers a consistent green aesthetic regardless of seasonal changes.

One of the primary benefits is reduced maintenance. Without the need for mowing, fertilising, or regular watering, homeowners save time, energy, and resources.

This makes synthetic grass appealing in regions with water restrictions or variable rainfall, such as Perth. Its durability withstands heavy foot traffic, making it ideal for family backyards and pet areas.

Turf Material

High-quality synthetic grass forms the foundation of any installation. Look for products with UV stabilisation, durable backing, and effective drainage perforations to prevent water from pooling beneath the surface.

Pile height between 25–35mm offers a natural look while promoting airflow through the base.

Tips for Local Sourcing

Purchasing from reputable Perth-based suppliers ensures turf meets Australian standards and is suited to regional weather patterns. Ask about colour, texture, and density before committing, reducing the risk of selecting an unsuitable product.

Base and Underlay

A compacted crushed rock or road base layer provides stability and aids drainage. On top of this, a shock-absorbing underlay can enhance comfort and help with moisture dispersion.

For mould prevention, consider antimicrobial underlays designed specifically for synthetic turf systems.

Tips for Local Sourcing

Landscape supply yards in Perth often carry both base materials and underlay in bulk quantities. Ordering through local contractors can sometimes secure better pricing and ensure the correct grade of material is delivered.

Infill Material

Infill keeps turf blades upright, adds weight for stability, and can improve drainage. Options include silica sand, coated sand with antimicrobial properties, or alternative organic infills.

For mould prevention, antimicrobial-coated sand is recommended, as it discourages bacterial and fungal growth.

Joining and Edging Materials

Seam tape and adhesive secure turf joins, while edging materials such as treated timber, aluminium, or composite plastics keep borders tidy and stable.

Choosing moisture-resistant edging materials helps reduce decay and water retention near the turf base.

Tools and Accessories

Essential tools include utility knives for precise cutting, a compactor for base preparation, a stiff broom or mechanical brush for maintenance, and a turf roller for settling the surface.

Optional accessories, such as power sweepers, can streamline larger projects.

Step 1: Prepare the Site

Remove existing grass, weeds, or debris from the installation area. Use a turf cutter or shovel to achieve a consistent depth across the space. Check for existing irrigation or drainage systems to avoid accidental damage during excavation.

Step 2: Install the Base Layer

Spread a layer of crushed rock or road base to around 75–100mm depth, compacting it thoroughly with a plate compactor. Ensure the surface slopes slightly away from buildings to direct water run-off.

Best Practices

Double-check compaction to prevent future depressions. Poor compaction can lead to uneven surfaces and water pooling, which increases the risk of mould.

Step 3: Lay the Underlay

Place an antimicrobial underlay across the compacted base to improve drainage and reduce mould risk. Trim edges neatly to fit the prepared space.

Step 4: Position and Cut the Turf

Roll out the synthetic grass, leaving it in position for a few hours to settle. Cut using a sharp utility knife, ensuring blades are replaced regularly for clean edges.

Best Practices

Align turf fibres in the same direction for a uniform appearance. Avoid stretching the turf, which can cause wrinkles or gaps later.

Step 5: Join and Secure the Turf

Use seam tape and outdoor adhesive to bond turf edges together. Install edging materials along the perimeter for a stable and tidy finish.

Step 6: Add Infill Material

Spread antimicrobial silica sand evenly using a drop spreader, then brush into the fibres with a stiff broom or mechanical brush.

Best Practices

Avoid overfilling, which can affect drainage performance. A light top-up every 6–12 months helps maintain stability and hygiene.

Step 7: Final Inspection and Clean-Up

Check for loose edges, bumps, or uneven sections, correcting any issues before use. Rinse the surface lightly to remove dust from the installation process.

Preventing mould involves careful planning, quality materials, and consistent upkeep. Addressing potential issues early helps protect both appearance and longevity, ensuring the investment delivers year-round benefits.

Key takeaways:

• Quality turf with UV stabilisation, drainage perforations, and antimicrobial backing reduces mould risk.
• Proper site preparation, including compaction and slope grading, ensures effective water runoff.
• Antimicrobial underlay and infill create an added barrier against bacterial and fungal growth.
• Local regulations should be checked, especially for drainage alterations or strata-managed properties.
• Tailoring turf choice to property conditions and usage patterns improves both comfort and durability.
• Correct tools and installation techniques are essential for a professional finish and long-term performance.
• Financial planning with local sourcing and seasonal deals can lower upfront costs without sacrificing quality.

Protecting your artificial turf from mould starts with informed choices and expert guidance.

Whether you’re planning a brand-new installation or looking to upgrade an existing surface, the right advice can make all the difference.

Our team at Evergreen Synthetic Grass can help offer tailored recommendations that match your property’s needs, lifestyle, and budget.

Our team will help you design a turf solution that stays fresh, safe, and beautiful all year round — while avoiding the pitfalls that lead to costly repairs.

Contact us online for a free quote or call 08 9303 2130 to take the first step toward a more inviting bowling green.