Amgrow Winter Grass Killer 100mL – Selective Herbicide for Couch & Buffalo Lawns

Amgrow Winter Grass Killer 100mL

Amgrow Winter Grass Killer is a selective post-emergent herbicide for controlling winter grass in established lawns. It targets winter grass after it has emerged while allowing compatible turf varieties to remain in place when the product is applied according to the label.

The concentrated 100mL formulation contains 175g/L endothal as the dipotassium salt. Apply it before winter grass develops seed heads to help prevent further seed from spreading through the lawn.

Identifying Winter Grass

Winter grass, also known as Poa annua, is a light-green grassy weed that commonly grows in small tufts. It develops pale seed heads and can spread rapidly when allowed to mature and drop seed.

Early treatment is important because established winter grass can produce large quantities of seed, leading to recurring lawn infestations in following seasons.

Suitable Lawn Types

The registered label lists use on:

• Blue Couch

• Common Couch

• Bent grass

• Buffalo grass

• Brown Top lawns

Do not use on:

• Kikuyu lawns

• Fescue lawns

• Unidentified turf varieties

• Lawns under severe heat or moisture stress

When the lawn type is uncertain, identify the turf before applying a selective herbicide.

Product Details

• Brand: Amgrow

• Product type: Selective post-emergent lawn herbicide

• Pack size: 100mL

• Active constituent: 175g/L endothal

• Chemical form: Endothal as the dipotassium salt

• Target weed: Winter grass

• Application rate: 15mL in 10 litres of water

• Coverage: 100m² per 15mL application

• APVMA approval number: 56738

• Poison schedule: Schedule 6

At the labelled rate, one 100mL bottle provides enough concentrate to treat up to approximately 660m² in total.

How to Mix

Shake the original container before use.

• Measure 15mL of concentrate

• Add it to 10 litres of clean water

• Mix or agitate thoroughly

• Continue agitating during application

• Prepare only enough solution for the day’s work

• Do not add a wetter, surfactant or spray oil

The prepared 10-litre solution treats approximately 100m² of lawn.

How to Apply

Apply as an even, fine spray while the winter grass is actively growing and before seed heads appear.

• Apply from autumn through spring

• Treat the lawn as soon as winter grass becomes visible

• Spray evenly over the affected area

• Apply two to three treatments where required

• Space applications approximately 10–14 days apart

• Do not apply when temperatures exceed 25°C

• Prevent spray drift onto desirable plants

• Do not mow immediately before or after treatment unless permitted by the current label

Bare areas may be resown approximately two weeks after the final application where required.

Best Time to Treat Winter Grass

Apply before the weed flowers and produces seed. Treating mature winter grass after seed heads have formed may kill existing plants but will not prevent already-developed seed from remaining in the lawn.

For recurring winter grass problems, early identification and consistent seasonal lawn maintenance can improve long-term control.

Important Safety Directions

Amgrow Winter Grass Killer is a hazardous Schedule 6 poison. The current Safety Data Sheet classifies the concentrate as harmful if swallowed or in contact with skin and highly dangerous if spray mist is inhaled.

• Keep out of reach of children

• Wear protective gloves

• Wear protective clothing

• Use suitable eye protection

• Avoid breathing spray mist

• Apply only outdoors or in a well-ventilated area

• Do not eat, drink or smoke while mixing or spraying

• Wash hands, arms and face after use

• Wash contaminated clothing before reuse

• Keep people and pets away from the treatment area during application

• Follow all label-specified re-entry directions

If poisoning or significant exposure occurs, contact a doctor or the Australian Poisons Information Centre on 13 11 26.

Environmental Precautions

Endothal products can be highly toxic to fish, aquatic invertebrates and wildlife.

• Do not allow spray to enter drains

• Keep away from ponds and waterways

• Avoid spraying near aquatic environments

• Do not contaminate animal drinking water

• Prevent spray drift onto desirable garden plants

• Clean up spills according to the product label and Safety Data Sheet

Storage

• Store in the original closed container

• Keep in a cool, dry and ventilated location

• Protect from direct sunlight

• Store locked away from children

• Keep separate from food and animal feed

• Do not store prepared spray solution

• Dispose of the empty container according to label directions

Key Features & Benefits

• Selective control of winter grass

• Suitable for compatible Couch and Buffalo lawns

• Contains 175g/L endothal

• Post-emergent treatment for visible weeds

• Treats approximately 100m² per 15mL

• 100mL bottle treats up to approximately 660m²

• Applied as a fine lawn spray

• Two to three applications may provide improved control

• Breaks down quickly in soil

• Best applied before winter grass forms seed heads

• Available from Bonnyrigg Produce & Garden Supplies in South-West Sydney

Frequently Asked Questions

What does Amgrow Winter Grass Killer control?

It selectively controls winter grass, also known as Poa annua, in compatible established lawns.

How much should I mix in water?

Mix 15mL of concentrate in 10 litres of water. This prepared solution treats approximately 100m².

How many applications are required?

The product information recommends two to three applications spaced approximately 10–14 days apart where required.

Can it be used on Buffalo grass?

Yes. Buffalo is included among the compatible lawn varieties on the registered label.

Can it be used on Kikuyu lawns?

No. Amgrow states that Winter Grass Killer is not suitable for Kikuyu lawns.

Can it be used on fescue?

No. The manufacturer advises against using it on fescue lawns.

When should Winter Grass Killer be applied?

Apply from autumn through spring as soon as winter grass appears and before seed heads form. Do not apply when temperatures exceed 25°C.

Should I add a wetting agent?

No. The official directions specifically state not to add a wetter.

How much lawn does the 100mL bottle treat?

At 15mL per 100m², the bottle contains enough concentrate to treat approximately 660m² in total.

Where can I buy Amgrow Winter Grass Killer in Sydney?

Amgrow Winter Grass Killer 100mL is available from Bonnyrigg Produce & Garden Supplies in Bonnyrigg, South-West Sydney.