David Grays Blockade H Winter Grass Killer 125g – Selective Winter Grass Herbicide

Selective Winter Grass Control for Couch and Buffalo Lawns

David Grays Blockade H Winter Grass Killer gives you selective control of winter grass (Poa annua) in home lawns and sports turf. It contains Propyzamide at 100g/kg and works through the roots to target both germinating winter grass seed and established plants, while leaving suitable turf unharmed. This 125g pack treats over 200 square metres.

Dual Pre- and Post-Emergent Action

The strength of this product is that it works two ways. It stops germinating winter grass seed before it establishes, and it also kills winter grass that is already visible in the lawn. Taken up through the root zone, it stunts and controls winter grass over a few weeks and keeps working in the soil to block new germination, so you are treating both today's problem and the next wave.

Safe on the Right Lawns

It is selective, which means it is designed to control winter grass without harming certain lawn types. It is suitable for use on couch and buffalo lawns. It is not suitable for Kikuyu, ryegrass, fescue or bent lawns, and should not be used on heavy, red or peaty soils, so it is important to know your lawn type before applying.

Long-Lasting Protection

Because it stays active in the soil, it provides ongoing protection against new winter grass germinating through the cooler months, helping keep your turf dense and clean rather than needing constant re-treatment. Applying before winter grass flowers and sets seed gives the best long-term result.

Key Features & Benefits

• Selective winter grass herbicide for lawns and sports turf
• Active constituent: Propyzamide 100g/kg
• Dual action on both germinating seed and established winter grass
• Works through the roots for sustained control
• Suitable for couch and buffalo lawns
• Not for Kikuyu, ryegrass, fescue or bent lawns, or heavy, red or peaty soils
• Long-lasting soil protection against new germination
• 125g pack treats over 200 square metres

How to Use

Apply in late autumn to winter when winter grass is active, mixing at the rate shown on the label (around 60g per 10L of water per 100 square metres) and spraying evenly over couch or buffalo turf. Water in immediately with 12 to 25mm of irrigation or rainfall, followed by a light watering around 24 hours later to move it into the root zone. For best results apply before winter grass flowers and sets seed, avoid spraying stressed or wet weeds, and follow all label directions. Keep pets off treated areas until dry, and do not reseed the area for 60 days.

Frequently Asked Questions

What is the active ingredient?
It contains Propyzamide at 100g/kg, a selective herbicide that works through the roots.

Which lawns can I use it on?
It is suitable for couch and buffalo lawns. It is not suitable for Kikuyu, ryegrass, fescue or bent lawns, and should not be used on heavy, red or peaty soils.

How does it control winter grass?
It works on both germinating seed and established plants, taken up through the roots to stunt and control winter grass, and it keeps working in the soil to block new germination.

When should I apply it?
In late autumn to winter when winter grass is active, and ideally before it flowers and sets seed. Water it in as directed so it reaches the root zone.

What area does the 125g pack treat?
The 125g pack treats over 200 square metres at the recommended rate.

Where can I buy David Grays Winter Grass Killer in Australia?
It is available online from BPG Supplies in a 125g pack, with shipping across Australia and local pickup in Bonnyrigg, NSW.