Barricade Pre-Emergent Herbicide HG

Barricade is a prodiamine herbicide (formulated at 480g/L), offering purpose-built, pre-emergent weed control in lawns, garden beds, and potted plants. It works by forming a barrier in the soil to stop weed seeds from germinating, subsequently delivering up to six months of control from just one application.

Barricade Pre-Emergent Herbicide HG is effective against a wide range of grassy and broadleaf weeds including winter grass, summer grass, crabgrass, crowsfoot, and African lovegrass, and is safe for use on a range of established Australian turf species such as buffalo, couch, and Kikuyu.

This specific product is formulated for homes and gardens and is delivered in a convenient 250mL pack. For larger pack sizes, see Barricade Herbicide.

Active ingredient: Prodiamine @ 480g/L

Comparable to: Spartan Herbicide (Turf Culture) | Onset 10GR Herbicide (Indigo)

Pack size: 250mL

Registrant: Syngenta Australia Pty Ltd (APVMA #93901)

Click For Technical Info & Tips For Use

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Description

How Barricade Pre-Emergent Herbicide works

Barricade Herbicide HG is formulated with prodiamine, which belongs to the dinitroaniline family of herbicides (Group 3) and works by inhibiting microtubule — the protein structures that weeds need for cell division — assembly. When a weed seed begins to germinate in treated soil, prodiamine blocks the cell division process, preventing root development and killing the seedling before it’s able to break the surface.

Established turf roots growing below the treated zone will remain unaffected as Barricade binds tightly to soil particles in the top 1 to 2cm, rather than leaching deeper into the profile.

Does Barricade Pre-Emergent Herbicide kill weeds?

Something critical to understand about Barricade Pre-Emergent Herbicide is that it prevents weeds, and does not kill existing ones. If you already have winter grass or summer grass growing in your lawn, you’ll need a post-emergent herbicide to remove them first. Once they are under control, administer Barricade for optimal ongoing summer and winter grass prevention. The real power of pre-emergent control is breaking the germination cycle over successive seasons, with each application reducing the weed seed bank in soil, resulting in fewer weeds each year.

Suitable lawn and turf grass species for applying Barricade Pre-Emergent Herbicide

Barricade can be used on the following established lawn and turf grasses:

Buffalo
Carpet
Couch (common and hybrid)
Kikuyu
Queensland blue couch
Seashore paspalum
Zoysia

Common weeds controlled by Barricade Pre-Emergent Herbicide

Barricade targets a wide range of weeds dependent on context.

In established lawns and turf grasses

African lovegrass
Bahia grass
Barnyard grass
Crabgrass
Crowsfoot grass
Kentucky blue grass
Parramatta grass
Paspalum
Rat’s tail fescue
Summer grass
Winter grass

In garden beds (under mulch) and potted plants

African lovegrass
Barnyard grass
Chickweed
Crabgrass
Creeping oxalis
Crowsfoot grass
Cudweed
Paspalum
Prairie grass
Rat’s tail fescue
Ryegrass
Sow thistle
Summer grass
Willowherb
Winter grass

When to apply Barricade Pre-Emergent Herbicide in Australia

With pre-emergent herbicides, timing is everything. Apply before target weeds germinate for best results:

Summer weeds (summer grass, crabgrass, crowsfoot): Apply before spring soil temperatures trigger germination, which is around late August in most Australian regions. Protection will last through to late February.

Winter weeds (winter grass): Apply around the end of February before autumn germination can begin. Protection will last through to late August.

Frequently asked questions

Does Barricade kill existing weeds?

No, Barricade is a strictly preventative herbicide. It stops weed seeds from germinating but has no effect on weeds that have already emerged. If you’re dealing with existing weeds, remove them using a suitable post-emergent herbicide first, then apply Barricade to prevent regrowth.

Can I use Barricade in garden beds and on potted plants?

Yes, Barricade can be used in garden beds and on potted plants. It controls a broad range of weeds in garden beds (under mulch) and potted plants — including creeping oxalis, cudweed, chickweed, sowthistle, and ryegrass — in addition to the grassy weeds it controls in turf.

How much area does the 250mL pack cover?

When applied at the rates listed on the Product Label, a 250mL pack of Barricade Pre-Emergent Herbicide HG will cover approximately 312m² to 833m² (dependent on the chosen rate). Higher rates will provide longer-lasting control in high weed-pressure situations.

What is the difference between Barricade HG and professional Barricade?

The formula, developed by Syngenta, is identical between Barricade’s professional and home and garden (HG) products. The key difference is the pack size — Barricade Pre-Emergent Herbicide HG is 250mL of product for domestic use, with label directions tailored to home lawns and garden beds.

Features & Benefits

As a premier pre-emergent herbicide for use in homes and gardens, Barricade offers:

Extended residual control: Barricade Pre-Emergent Herbicide HG provides up to four months of weed control from a single application per season.
Cost-effective weed management: Using this product is an economical solution for controlling a range of weeds, including African lovegrass, Parramatta grass, summer grass, crabgrass, crowsfoot grass, and winter grass.
Flexible application timing: Barricade can be applied well before weed germination, allowing for proactive weed management.
Low odour formulation: Barricade Pre-Emergent Herbicide features a low odour profile and a non-staining formulation for ease of use in sensitive areas.
Convenient pack size: This product comes in a practical 250mL pack, suitable for smaller-scale applications (e.g., home lawns and garden beds).

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Directions Of Use

Barricade Pre-Emergent Herbicide HG directions for use

How To Use:

Apply Barricade Pre-Emergent Herbicide before weed germination for preventative control of up to 6 months.
Apply in early spring (summer weeds) or late summer to early autumn for Winter Grass.
Barricade Pre-Emergent Herbicide does not control weeds that have already germinated; therefore, a post-emergent herbicide should be applied to remove these weeds.

Situation: Established lawns and turf grass, including: Buffalo Grass, Carpet Grass, Couch (Common, Hybrid), Qld Blue Couch, Kikuyu, Seashore Paspalum and Zoysia

Weeds: Barnyard Grass, Crab Grass, Parramatta Grass, Rat’s Tail Fescue, Summer Grass, Crowsfoot Grass, African Lovegrass, Bahia Grass, Kentucky Blue Grass, Paspalum and Winter Grass

Rate:

Garden Sprayer: Use 30 mL per 10 L of water and spray over 100 m²
Watering Can: Mix 3 mL in 9 L of water and evenly apply over 10 m²

Critical Comments:

For all weeds (except Winter Grass);
- Apply before weed emergence.
- For best results, apply in early spring for preventative control of up to 6 months.
For Winter Grass;
- Apply in late summer to early autumn before weed emergence for preventative control of up to 6 months.

For all grasses, lightly water in, within 24 hours of application.

Situation: Garden beds (under mulch) and potted plants.

Weeds: African Lovegrass, Barnyard Grass, Chickweed, Crab Grass, Crowsfoot Grass, Creeping Oxalis, Cudweed, Paspalum, Prairie Grass, Rat’s Tail Fescue, Ryegrass, Sow Thistle, Summer Grass, Willowherb and Winter Grass

Rate:

Garden Sprayer: Use 40 to 80 mL per 10 L of water and spray over 100m²
Watering Can: Mix 4 to 8 mL in 9 L of water and evenly apply over 10m²

Critical Comments:

Apply before weed emergence for residual control of up to 4 months in potted plants and up to 6 months in garden beds under mulch.
Use higher rates in situations of high weed pressure.
Apply the product to garden beds and wash in before applying mulch so that the herbicide reaches the soil.
Water immediately after application with a minimum of 3mm of rain or irrigation.

Rates are a general guide only. Before opening, carefully read Barricade Pre-Emergent Herbicide HG directions for use, precautionary and protection statements, storage and disposal, safety directions and first aid instructions. The product is designed for the particular purpose indicated on the label. Failure to use the product strictly as directed may be illegal and dangerous, and render the product ineffective.

Questions and answers from customers

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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
Bahia Grass - Established, Buffalo Grass - Established, Carpet Grass - Established, Common Couch Lawn Or Turf, Hybrid Couch, Kikuyu - Established, Queensland Blue Couch - Established, Saltwater Couch And Zoysia Grass Turf - Established	African Lovegrass, Bahia Grass, Barnyard Or Water Grass, Crowsfoot Grass, Kentucky Bluegrass, Parramatta Grass, Paspalum, Silver Grass Or Rat's-Tail Fescue, Summer Or Crab Grass, Winter Grass
Garden Bed	African Lovegrass, Barnyard Or Water Grass, Chickweed, Creeping Oxalis, Crowsfoot Grass, Cudweed, Paspalum, Prairie Grass, Ryegrass, Silver Grass Or Rat's-Tail Fescue, Sow Or Milk Thistle, Summer Grass, Summer Or Crab Grass, Willowherb, Winter Grass
Potted Plant	African Lovegrass, Barnyard Or Water Grass, Chickweed, Creeping Oxalis, Crowsfoot Grass, Cudweed, Paspalum, Prairie Grass, Ryegrass, Silver Grass Or Rat's-Tail Fescue, Sow Or Milk Thistle, Summer Grass, Summer Or Crab Grass, Willowherb, Winter Grass

Tips For Use

How To Prepare:

Mix Barricade Pre-Emergent Herbicide as per the instructions below into a diluted mixture ready for application.
If the diluted solution is left standing for some time, make sure you shake/agitate before use.

Mixing: Garden Sprayer

Before opening, shake the Barricade Pre-Emergent bottle well.
Add half the required amount of water to your garden sprayer.
Add the required quantity of Barricade Pre-Emergent to the half-full garden sprayer.
Add the remaining water required and ensure the sprayer is closed before agitating the sprayer.
Only mix sufficient spray solution for the application area and for the day of mixing.

Mixing: Watering Can

Before opening, shake the Barricade Pre-Emergent bottle well.
Add half the required amount of water to your watering can.
Add the required quantity of Barricade Pre-Emergent to your watering can.
Add the remaining water required and use the process to agitate the mixture.
Only mix sufficient spray solution for the application area and for the day of mixing.

How To Apply:

Lawn

Measure the lawn area before application to determine the size and make up enough mixture to apply over the area.
Evenly spray (or pour) the mixed solution over the area to be treated.
Lightly water in, within 24 hours of application.
Thoroughly clean all equipment after application.
Empty and thoroughly rinse equipment such as sprayer, hoses, nozzles, and watering can with clean water.

Garden beds and potted plants

Measure the garden bed or potted plant area before application, and make up enough mixture to apply to that area.
Apply before weed emergence (remove existing weeds) and ensure the product is placed as close to the soil surface as possible.
Ensure the product is applied before mulching.
Wash in immediately with a minimum of 3 mm of rain or irrigation.
Thoroughly clean all equipment after application.
Empty and thoroughly rinse equipment such as sprayer, hoses, nozzles, and watering can with clean water.

Restraints:

Do not apply to turf under stress, newly seeded, newly laid turf or sprigged turf.
Delay application until turf is at 100% cover and established with a root system developed beyond 3 cm depth.
Do not apply if heavy rain has been forecast within 48 hours or to waterlogged soil.
Do not water or irrigate to the point of runoff within 3 days of application.
Do not apply in vegetable gardens or around fruit trees or sensitive plants.
Do not apply to garden beds over the top of mulch.
Do not apply to recently re-potted or newly potted seeds, cutting divisions or plants.
Allow a period of establishment to allow a substantial root system to develop.
Do not plant seeds in treated soil for 6 months after application.

Precautions:

Do not allow spray or drift to contact recently planted or non-established plants, or vegetable gardens.
Do not allow chemical containers or spray to get into drains, sewers, streams or ponds.
Do not replant any crop, ornamentals or overseed with cool-season grasses for winter cover to treated areas for a period of 6 months after application.
Do not allow entry into treated areas until the spray has dried.

Storage:

Store in the closed, original container in a cool, dry place out of the reach of children.
Do not store in direct sunlight.

Safety Directions:

May irritate the skin, will irritate the eyes.
Avoid contact with eyes and skin.
When preparing the product for use and using the product, wear safety glasses.
If the product or spray gets in the eyes, wash them out immediately with water.
Wash your hands after use.
After each day’s use, wash safety glasses.

First Aid Instructions:

First aid is not generally required.
If in doubt, contact a Poisons Information Centre (phone Australia 13 11 26) or a doctor.
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/lawn or feed turf/lawn clippings from any treated area to poultry or livestock.

SDS & Technical

Barricade Pre-Emergent Herbicide HG Label (APVMA)	Download Pdf
Barricade Pre-Emergent Herbicide HG Label	Download Pdf
Barricade Pre-Emergent Herbicide HG SDS	Download Pdf
Barricade Pre-Emergent Herbicide HG Brochure	Download Pdf