Monument Herbicide 100ml | Kikuyu & Wintergrass Killer for Couch Lawns

If you have kikuyu invading your couch lawn, winter grass (Poa annua) taking over in the cooler months, nutgrass spreading through your turf, or a mix of grassy and broadleaf weeds that nothing seems to touch. Monument is the product turf professionals and serious lawn enthusiasts reach for first.

Monument Liquid is a professional-grade selective herbicide by Syngenta that controls an exceptionally broad spectrum of weeds in couch lawns without damaging your turf when used correctly. Fully systemic, it's absorbed through the root, shoot and leaf meaning it kills weeds from the inside out, not just on the surface.

Not suitable for buffalo, kikuyu or zoysia lawns. Monument is designed for use on couch and hybrid couch turf only. Using on other turf types may cause damage.

What Monument Controls

Kikuyu - suppresses and weakens kikuyu runners invading couch, with repeated applications delivering progressively stronger control and eventual kill down to the roots
Winter grass (Poa annua) - one of the most effective post-emergent winter grass killers available for couch lawns
Ryegrass -ideal for removing oversown ryegrass in spring as couch comes out of dormancy
Nutgrass & sedges -broad-spectrum sedge control including nutgrass (Cyperus rotundus), one of the most difficult weeds to eliminate
Broadleaf weeds -controls a wide range of common broadleaf weeds in a single application

Key Features

• Broad-spectrum selective weed control - grasses, sedges and broadleaf weeds in one product
• Fully systemic action - absorbed through roots, shoots and leaves for complete kill, not just surface burn
• Extremely concentrated - 100ml covers 3,300-8,695m² (at 1.15-3ml per 100m²)
• Low application rate means outstanding value per treatment despite the upfront cost
• Convenient liquid formulation - mixes readily with water, no complicated preparation
• Low environmental loading
• Long-lasting residual action - follow-up applications are rarely needed after initial treatment
• Professional-grade product by Syngenta - trusted by golf courses, sports turf managers and lawn enthusiasts across Australia

Application Rate

1.15-3ml per 100m² mixed with water, applied with a pressure sprayer

Add a surfactant: Always mix with a non-ionic surfactant (such as Wetter 600) to improve coverage, adhesion and uptake especially on waxy-leafed weeds and sedges

Seasonal Application Guide

Autumn (March - May) - Winter Grass Prevention
Apply Monument as a post-emergent treatment at first sight of winter grass seedlings germinating. For best long-term results, pair with Barricade pre-emergent herbicide applied before germination to create a two-stage defence.

Winter (June - August) - Active Winter Grass & Broadleaf Control
Post-emergent control of actively growing winter grass, broadleaf weeds and sedges. Apply to actively growing weeds for maximum uptake and results.

Spring (September - November) - Ryegrass Removal & Kikuyu Suppression
The ideal time to remove oversown ryegrass as your couch breaks dormancy and comes back to life. Also the prime window for kikuyu suppression. Monument weakens kikuyu runners while the couch remains unaffected, allowing the couch to outcompete and reclaim the area over multiple applications.

Is the $218.90 Price Worth It? The Cost-Per-Application Story

At first glance, Monument is a significant investment. But at a rate of just 1.15-3ml per 100m², a 100ml bottle covers between 3,300 and 8,695m². For a typical 200m² residential lawn, that's potentially 16-43 applications per bottle — making each treatment as low as $5-$13. For a product that solves one of the most persistent and frustrating problems in Australian lawn care, the cost per application is extremely competitive.

As one of our customers put it: "The cost is quite high; however, the results speak for themselves."

Monument + Barricade - The Complete Winter Grass Strategy

Monument is one half of the most effective winter grass control program available to Australian homeowners. For year-round protection:

• Barricade (pre-emergent) - applied in late summer/early autumn to prevent winter grass seeds from germinating
• Monument (post-emergent) - applied to control any winter grass that breaks through, and for all other grassy weeds, sedges and broadleaf weeds

Monument Herbicide Instructions

Download Monument Herbicide Instructions (PDF)

Monument Herbicide SDS

Download Monument Herbicide SDS (PDF)