Monument Liquid Turf Herbicide (Trifloxysulfuron)

Monument Liquid Turf Herbicide is a critical tool in the post-emergent control of a range of weed species, including sedges, broadleaf weeds, and grasses found in established warm-season couch turf. It relies on 100g/L of trifloxysulfuron sodium, a fully systemic, Group B ALS-inhibiting herbicide, to deliver optimal results against weeds like winter grass, ryegrass, bindii, clover, and nutgrass. Monument is also effective at suppressing kikuyu and bahia grass seedheads.

Its oil dispersion (OD) formulation mixes readily with water for easy, stress-free application. When combined with a quality non-ionic surfactant, Monument Liquid Turf Herbicide is an extremely beneficial post-emergent turf weed killer.

Active ingredient: Trifloxysulfuron @ 100g/L

Comparable to: Recondo 100WG Herbicide (Indigo)

Pack sizes: 100mL and 1L

Registrant: Syngenta Australia Pty Ltd (APVMA # 62571)

Click For Technical Info & Tips For Use

5 out of 5 (4 customers reviews)

Quantity	Discount Price (per item)	Status
2 or more	$205.00 each	Available
2 or more	$1,350.00 each	Available

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Description

Why choose Monument Liquid Turf Herbicide?

Monument offers a range of benefits to users, including:

Highly effective control of tough-to-kill species like winter grass, ryegrass, Kikuyu, sedges, and a variety of broadleaf weeds
Convenient liquid formulation with low environmental loading
Excellent resistance management when used in a targeted strategy with Barricade Turf Herbicide
Fully systemic action with root, shoot, and leaf uptake
Effective management of bahia seedheads
Long-lasting herbicidal action with follow-up applications rarely required (except for Kikuyu suppression)

Which turf species can Monument Herbicide be applied to?

Monument can be used as a post-emergent herbicide on the following warm-season turf species:

Common couch (Cynodon dactylon)
Durban grass (Dactyloctenium australe)
Hybrid couch (Cynodon dactylon x Cynodon transvaalensis)
Queensland blue couch (Digitaria didactyla)
Zoysia grass (Zoysia japonica)

This product must not be applied to bentgrass, buffalo, centipede grass, fescue, Kikuyu, paspalum, ryegrass, or any other turf species not listed in the directions for use. Transient discolouration may occur on Queensland blue couch and zoysia after application.

Which weed species does Monument Liquid Turf Herbicide control?

Monument Liquid Turf Herbicide can be used as a post-emergent herbicide to control a wide range of weeds, including:

Bahia grass seedheads (Paspalum notatum) [when tank-mixed with Primo growth regulators; suppression only]
Bindii (jo-jo) [Soliva sessilis]
Burr medic (Medicago polymorpha)
Cat’s ear (flatweed) [Hypochaeris radicata]
Chickweed (Stellaria media)
Clover (Trifolium repens)
Cotula (Cotula australis)
Creeping oxalis (Oxalis corniculata)
Curled dock (Rumex crispus)
Kikuyu (Pennisetum clandestinum) [suppression only]
Milk thistle (Sonchus oleraceus)
Mullumbimby couch (Cyperus brevifolius)
Nutgrass (Cyperus rotundus)
Perennial ryegrass (Lolium perenne)
Winter grass (Poa annua)

Can Monument Herbicide be used on buffalo grass?

No — Monument is not registered for use on buffalo grass. It should only be applied to common couch, durban grass, hybrid couch, Queensland blue couch, and zoysia. Applying Monument Liquid Turf Herbicide to buffalo grass constitutes off-label use and may cause turf damage.

For sedge and broadleaf weed control in buffalo grass, consider a registered alternative like Sempra Herbicide, which uses the active ingredient halosulfuron.

Will Monument kill the Kikuyu grass growing into a couch lawn?

Monument Liquid Turf Herbicide suppresses Kikuyu, but will not fully eradicate it. For best results, apply at 300mL/ha across two applications, 21 to 28 days apart. Autumn applications have been found to deliver the most consistent results.

After application, expect ongoing growth reduction and turf thinning rather than a complete kill. Kikuyu is a persistent perennial weed with an extensive stolon and rhizome system, and one application is unlikely to provide complete control. Repeat treatments in subsequent seasons may be necessary to maintain suppression effects.

How do Monument and Barricade Herbicide work together?

Monument Liquid Herbicide and Barricade Herbicide address different phases of weed management. Monument is post-emergent, which means it controls weeds that are already growing, whereas Barricade is pre-emergent, and prevents weed seeds from germinating before they emerge.

Together, these products form a two-phase program: Monument cleans up existing weeds whilst Barricade stops the next flush from establishing. Syngenta’s technical literature supports tank mixing the two, so they can be applied in a single pass.

Monument and Barricade have proven particularly effective at managing winter grass and ryegrass in couch grass, and together, they support Group B resistance management based on the two modes of action present.

Do I need to water in Monument after spraying?

No, you do not need to water in Monument Herbicide after application. It is a foliar-absorbed herbicide that works through leaf, crown, and shoot uptake.

For best results, allow the spray to dry on the leaf before any irrigation. Normal post-application irrigation then places Monument into the soil profile, where it will continue to be taken up by weed roots. This dual foliar and root uptake is part of what makes Monument so effective against perennial sedges with deep tuber systems.

The product is rainfast within three hours of application.

How long does Monument Liquid Turf Herbicide take to work?

The speed of weed kill when using Monument will depend on soil temperature and weed growth stage. During summer, when soil temperatures are above 15°C and weeds are actively growing, expect visible symptoms in three to six weeks. In late winter with cooler soil temperatures, allow six to eight weeks. Monument Herbicide has very little activity when soil temperatures are below 12°C.

Weeds that are no longer actively growing at the time of application, such as late-season ryegrass, may show reduced response regardless of temperature.

Can Monument be mixed with other herbicides in the tank?

The Monument Liquid Turf Herbicide product label approves tank mixing with Primo Maxx II Turf Growth Regulator and Primo 250EC Turf Growth Regulator. Syngenta’s technical literature also supports tank mixing Monument with Barricade Pre-Emergent Herbicide HG for combined pre- and post-emergent programs.

Do not mix Monument with acid-forming compounds, phenoxy herbicides, or any product that may lower the spray tank pH below 5.5, as the active constituent degrades rapidly under acidic conditions.

For any tank mix not listed on the product label, consult Syngenta or your agronomist before proceeding.

Features & Benefits

Monument Liquid Turf Herbicide is an extremely effective trifloxysulfuron herbicide for turf that offers the following benefits to users:

Systemic weed control: Monument Liquid Turf Herbicide contains 100 g/L trifloxysulfuron sodium, a fully systemic ALS-inhibiting active that moves through both the xylem and phloem to target weed growth points, including root tubers and stolons.
Broad-spectrum performance: Monument controls a wide range of turf weeds, including nutgrass, Mullumbimby couch, winter grass, ryegrass, bindii, clover, chickweed, cotula, creeping oxalis, burr medic, curled dock, cat’s ear, and milk thistle in established couch turf.
Turf suitability: Monument Herbicide can be used on common couch, durban grass, hybrid couch, Queensland blue couch, and zoysia across golf courses, sports fields, parks, roadsides, median strips, and residential lawns.
Easy-to-use formulation: The oil dispersion formulation mixes completely with water, supporting uniform coverage and straightforward application when administered at the recommended spray volumes.
Additional grass suppression: Monument Liquid Turf Herbicide suppresses Kikuyu when applied as a follow-up program, and can also suppress bahia grass seedheads when tank mixed with compatible Primo growth regulators.
Tank-mix compatibility: This product can be tank mixed with Barricade Pre-Emergent Herbicide to support integrated weed and resistance management strategies.
Resistance management support: As a Group B herbicide, Monument Liquid Turf Herbicide provides an alternative mode of action for turf programs where Group A or Group M herbicides are also in use.
Long-lasting results: A well-timed application with a non-ionic surfactant generally controls most target weeds without the need for follow-up treatments.

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What others are saying

Rated 5 out of 5
Redroo

Edward Dempsey (verified owner)
December 31, 2025

Very happy with the weed killer has c,learning all my weeds for me. I would buy again.

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Rated 5 out of 5
Exalent

Philip Trahar (verified owner)
April 5, 2023

One week on no rye grass. Weeds knocked on the head Kyiv Kia grass starting to turn. Great results.

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Rated 5 out of 5
Magical stuff

Fraser (verified owner)
January 29, 2022

So glad I invested in this. One 100ml bottle is going to last me years, and it is absolutely magical stuff – pinpoint accurate against all the grassy weeds whilst being perfectly harmless to basically all the turf grass varieties. Pretty much the only one suitable for Qld blue couch, so I’m loving it. It’s nailed the paspalum and bahia grass in my lawn in one application, so now my couch can finally get some breathing room.

Also, best price I’ve found in aus. Thanks specialistsales!

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Rated 5 out of 5
Slowly but sure

John van der (verified owner)
December 23, 2021

We have used this product now for close to a year, over 3 gardens. One garden was well maintained and has given the best results. The 2nd oldest garden has taken 3 treatments and the very old grass has finally given up. Oddly the chickweed has tried and also some patches with clover. The 3rd garden is fairly new, with an old footpath. This one is still under maintenance & the dogs dig up soil and grass, hence the green patches. I love walking around and grabbing old runners and lifting out about a foot worth of dead grass. We did sow some new couch seed with some growth improver as well on the old lawn. Overall we are very impressed with Monument Liquid Turf Herbicide. Some grass will die fast other well established old grass will take time.

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Directions Of Use

Click here for Monument Liquid Turf Herbicide directions for use.

Post-Emergent Weed Management:

Situation: Established turf as named – Common Couch, Hybrid Couch, QLD Blue Couch & Zoysia

Weeds Controlled & Application Rate:

Burr Medic – 115 mL per ha
Mullumbimby Couch – 150mL per ha
Bindi – 225 mL per ha
Ryegrass – 225mL per ha
Winter Grass – 225 mL per ha
Clover – 300 mL per ha
Catsear – 300 mL per ha
Cotula – 300mL per ha
Creeping Oxalis – 300mL per ha
Curled Dock – 300mL per ha
Chickweed – 300mL per ha
Milk Thistle – 300mL per ha
Kikuyu (Suppression Only) – 300 mL per ha

Notes:

Ensure product placement as uniformly as possible onto leaves and into crowns. Ideal application volume should be 400/800L/Ha. Use higher volumes to ensure sufficient coverage in higher cut turf (>15mm) in semi-roughs, roughs, parks etc.
The addition of a quality non-ionic surfactant at a rate of 0.25 to 0.5% v/v is recommended.
A repeat application may be needed in 4-6 weeks
Allow at least 6 weeks between last application and overseeding with cool season grasses for winter cover.
Transient discolouration may occur when applied to Qld Blue Couch and Zoysia
For Kikuyu Suppression, make 2 applications 21- 28 days apart. Best results are obtained from Autumn applications.

Bahia Grass (Paspalum notatum) Suppression and Seedhead Control:

Situation: Common Couch, Durban Grass, Hybrid Couch, QLD Blue Couch & Zoysia (only in golf courses, long roughs, lawns, median strips, ovals, parks, roadsides etc)

Grasses Controlled: Bahia Grass (Paspalum notatum) Suppression and seedhead control.

Application Rate: 75mL per Ha plus 2-4L per Ha Primo Maxx or 1-2 L/Ha Primo 250EC & 0.25%-0.42% v/v non-ionic surfactant

Notes:

Apply during the summer when Bahia Grass produces seedheads
Do not apply more than 2 consecutive applications of Monument Liquid per season
Important: Refer to the Monument Liquid label for specific directions on mixing, avoiding spray drift, sprayer cleanup and protection of non-target crops and the environment.

NB: The above information represents only a modified extract from the full registered label.

Rates are a general guide only. Before opening, carefully read Monument Liquid Turf Herbicide Directions for Use, Precautionary and Protection Statements, Storage and Disposal, Safety Directions and First Aid Instructions.

Questions and answers from customers

I have kikuyu in a couch lawn and plan to spot hand-spray with Monument Liquid Turf Herbicide over multiple patches of about 10m² each. The kikuyu is thick and prominent. Would my situation be considered high or low cut, and does the heavier infestation mean I need the higher rate?

Q I have kikuyu in a couch lawn and plan to spot hand-spray with Monument Liquid Turf Herbicide ove...... Read more
Asked by Neil on March 28, 2026 1:16 pm

Answered by the admin
A couple of important points here.

First, "high cut" and "low cut" on the Monument Liquid label refer to the height the turf is being mowed at, not the density or severity of the weed infestation. Low cut means turf maintained below approximately 15mm (e.g., golf fairways, bowling greens, intensively managed hybrid couch). High cut means turf maintained above 15mm — which covers the vast majority of home and park couch lawns. A standard home couch lawn is almost always in the high cut category.

The reason the water volume changes with cut height is canopy penetration. Taller, denser turf needs more water volume to carry the product down into the crowns and achieve even coverage. The amount of product per hectare stays the same — only the water volume changes. So, high cut is not a doubled product rate; it's the same product diluted into more water, which is why the concentration per litre is lower (0.28mL/L) than for low cut (0.56mL/L).

For your home couch lawn, high cut applies — use 0.28mL per litre of water.

Second, it's worth noting that Monument Liquid is registered for suppression only of kikuyu, not full control. Kikuyu is a persistent, deep-rooted grass, and Monument will set it back rather than eliminate it. Two applications 21–28 days apart are required, with the best results achieved from autumn applications.

Third, the Monument Liquid label specifies boom spray as the registered application method. The existing Q&A on this page addresses hand spraying in detail — in short, it is an off-label application method, and the outcome cannot be guaranteed, as even coverage is much harder to achieve with a hand sprayer. If you choose to proceed, you do so at your own risk, and we recommend contacting Syngenta Australia on 1800 022 035 for specific guidance.

I have a small back yard of 80 square meters with Santa-Anna Couch experiencing spring time growth time. I mowed at least 4 days before spraying. I sprayed with a 5 Ltr hand sprayer tank with a mix of 3ml Monument Liquid Turf Herbicide (Trifloxysulfuron) and 20ml of wetting agent. Do I need to water in at any stage?

Q I have a small back yard of 80 square meters with Santa-Anna Couch experiencing spring time growt...... Read more
Asked by Colin on October 9, 2024 1:07 pm

Answered by the admin
You do not need to water in Monument Liquid Turf Herbicide, and you should wait at least 24 - 48 hours before any watering or irrigation. Please note the Monument application is only registered to be applied by boom spray application as it is very important to get an even disbursement of the chemical over the target area. Often, with hand sprays, the application is much harder to spread evenly, resulting in higher than recommended rates being applied or spraying, causing damage and/or death of the host species. As a result, the outcome cannot be guaranteed.

When using Monument Liquid Turf Herbicide, when is the best time to mow the lawn? I’m thinking either a couple of days before or after the application. Also, once it is applied, should I wait 24 hours to water the lawn? Thanks in advance

Q When using Monument Liquid Turf Herbicide, when is the best time to mow the lawn? I’m thinking ei...... Read more
Asked by Jimi on September 30, 2022 7:35 am

Answered by the admin
When using Monument Liquid Turf Herbicide, optimum performance will be achieved if you avoid mowing for 1 to 2 days before and following application. Monument Liquid Turf Herbicide contains 100 g/L trifloxysulfuron sodium, a member of the sulfonylurea herbicides. Sulfonylureas are slow-acting herbicides, so the longer you can put off irrigation, the more time you will allow translocation to occur. Waiting at least 24-48 hours should be fine before irrigation.

Hi how much Monument Liquid Turf Herbicide per liter of water do i put in the spray bottle. cheers Mark

Q Hi how much Monument Liquid Turf Herbicide per liter of water do i put in the spray bottle. cheer...... Read more
Asked by mark brown on October 3, 2021 1:11 pm

Answered by the admin
The application of the Monument is only registered to be applied by boom spray application as it is very important to get an even disbursement of the chemical over the target area. Often with hand sprays, the application is much harder to spread evenly resulting in higher than recommended rates being applied or over spraying causing damage and/or death of the host species.

If you choose to go 'off-label', it is at your risk. The general mixing rate of Monument Herbicide for winter grass control is 225mL per 10,000m². This equates to 2.25mL of the chemical being applied evenly over a 100m² area.

There are also other factors to take into consideration such as the height of the turf you are spraying (ie high or low cut) and the water volume required for penetration of the chemical.

For lower cut turf the recommended water rate per Ha is 400L, which equates to 1L per 25m². So ff the mixing rate is 225mL/400L, then the per L mixing rate of Monument is 0.56mL per 1L.

For higher cut turf the recommended water rate per Ha is is 800L, which equates to 1L per 12.5m². So if the mixing rate of Monument is 225mL/800L, the per L mixing rate is 0.28mL per 1L.

If you are unsure about the application of Monument Herbicide we recommend you speak with the manufacturer, Syngenta Australia on 1800 022 035

This information and product advice is not intended to be advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Disclaimer: This information and product advice is not intended to be advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Host & Pest

Host	Pest
Host & Pest
Common Couch Lawn Or Turf, Durban Grass - Established, Hybrid Couch, Queensland Blue Couch - Established & Zoysia Grass Turf - Established	Bahia Grass, Burr Medic, Cat's Ears Or Flatweeds, Chickweed, Cotulas, Creeping Oxalis, Curled Dock, Jo-jo, Kikuyu Grass - Suppression, Mullumbimby Couch, Nutgrass, Perennial Ryegrass, Sow Or Milk Thistle, White Clover, Winter Grass

Tips For Use

Application Timing

Apply to actively growing weeds. Annual weeds such as Winter Grass and Ryegrass reach a “green skeleton” stage late in the season. At this point they are alive but no longer growing, and systemic uptake ceases. Applications to Ryegrass in early October, for example, may give sub-lethal results if sap flow has stopped.
Avoid mowing for 1 to 2 days before and after application. Mowing immediately before application reduces leaf surface area available for absorption. Mowing immediately after can remove treated tissue before the active ingredient has fully translocated.
Monument Liquid is most effective at soil temperatures of 15°C and above. Avoid application below 14°C. Activity effectively stops below 12°C.
For Kikuyu suppression, time the first application around the end of March and the second around the end of April for best autumn results.

Spray Tank Preparation

Test your water source. If pH is below 5.5, buffer to near pH 7 before adding Monument Liquid. The active constituent degrades rapidly in acidic conditions. Do not use phenoxy herbicides or acidifying fertilisers as tank mix partners.
Fill the tank no more than 25% full with clean water, then add Monument Liquid with vigorous agitation. Continue agitation throughout mixing and spraying. Add the non-ionic surfactant last at 0.25% v/v (1000 g ai/L products) or 0.42% v/v (600 g ai/L products).
Do not leave the spray solution standing in the tank overnight.
Avoid very cold water in the tank, as this can affect the OD formulation.

Spray Equipment and Volume

Target leaves and crowns. Use an XC 04 nozzle at 2 to 4 bar pressure.
Apply at 400 to 800 L/ha. In semi-roughs, roughs, and long-cut turf above 15 mm, use the higher end of the volume range to ensure adequate canopy penetration.
Monument Liquid is rainfast within 3 hours of application. Do not apply if rainfall is expected within 3 hours.
Do not apply more than two consecutive applications of Monument Liquid per season for Bahia Grass seedhead suppression.

Overseeding and Re-entry

Allow at least 6 weeks between the last application and overseeding with cool-season grasses for winter cover.
Do not allow entry into treated areas until the spray has dried. If re-entry is unavoidable before drying, wear cotton overalls buttoned to neck and wrist plus chemical-resistant gloves. Launder clothing after each day’s use.

Resistance Management

Monument Liquid is a Group B herbicide. Rotate with products from other mode-of-action groups to reduce selection pressure. Tank mixing with Barricade (Group D) pre-emergent is an effective integrated strategy.
Where Poa annua populations show patchy survival after treatment, this may indicate the presence of a tolerant biotype. Combine a pre-emergent such as Barricade with Monument Liquid to manage difficult populations.

First Aid

If poisoning occurs, contact a doctor or the Poisons Information Centre. Phone Australia 131 126.
For further information, refer to the Safety Data Sheet (SDS).

This information and product advice are not intended as advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Withholding Period

Withholding Period Details (WHP):

Do not graze treated turf or lawn.
Do not feed turf or lawn clippings from any treated area to poultry or livestock.
No numeric withholding period in days is stated on the label.
Re-entry: Do not allow entry into treated areas until the spray has dried unless wearing cotton overalls buttoned to the neck and wrist (or equivalent clothing) plus chemical-resistant gloves. Launder clothing after each day’s use.

SDS & Technical

Monument Liquid Turf Herbicide Label	Download Pdf
Monument Liquid Turf Herbicide SDS	Download Pdf
Monument Liquid Turf Herbicide Usage Tips	Download Pdf
Monument Liquid Turf Herbicide Sedge / Nutgrass Control	Download Pdf
Monument Liquid Turf Herbicide TechSheet	Download Pdf