Tackling Woody Weeds: Effective Control Methods

Woody weeds are a persistent problem for Australian gardeners, farmers, and land managers. These robust, invasive plants not only compete with native flora but can also take over pastures, degrade ecosystems, and create fire hazards. Understanding how to identify and effectively manage woody weeds is essential for maintaining healthy landscapes.

In this guide, we’ll explore what woody weeds are, why they’re problematic, and how to control them using proven products like Associate Herbicide and Metmac Herbicide.

What Are Woody Weeds?

Woody weeds are invasive plants that grow as shrubs or trees. Unlike herbaceous weeds, woody weeds develop tough, woody stems, making them harder to control. They often thrive in disturbed areas, quickly spreading and outcompeting native vegetation.

Some common woody weeds in Australia include:

• Lantana (Lantana camara): A dense shrub with bright flowers, toxic to livestock.
• Blackberry (Rubus fruticosus aggregate): An aggressive thorny bush that invades pastures and waterways.
• Gorse (Ulex europaeus): A spiny shrub with yellow flowers that forms impenetrable thickets.
• Boxthorn (Lycium ferocissimum): A prickly shrub often found in coastal areas and pastures.

These plants often establish in neglected or overgrazed areas, spreading via seeds, root systems, or cuttings. Without intervention, they can dominate landscapes, reducing biodiversity and productivity.

Why Are Woody Weeds a Problem?

1. Environmental Impact:
   Woody weeds can outcompete native plants, altering habitats and threatening wildlife.
2. Agricultural Damage:
   They reduce grazing land, restrict livestock movement, and harbour pests.
3. Fire Hazard:
   Many woody weeds, such as gorse and lantana, are highly flammable, increasing bushfire risks.
4. Costly to Control:
   Left unchecked, they require intensive labour and resources to manage.

Effective Woody Weed Control

Managing woody weeds requires an integrated approach, combining mechanical, chemical, and cultural control methods.

1. Mechanical Control

Physically removing weeds by hand-pulling, cutting, or using machinery can be effective for small infestations. However, many woody weeds resprout from roots, making follow-up essential.

2. Cultural Control

Good land management practices, such as maintaining healthy pastures and planting competitive vegetation, can prevent woody weeds from establishing.

3. Chemical Control

Herbicides are often the most efficient and effective way to control woody weeds, especially for large infestations.

Herbicide Solutions: Associate and Metmac

Associate Herbicide

Associate is a powerful herbicide formulated to control a wide range of woody weeds and other difficult plants. Its active ingredient, metsulfuron-methyl, targets the weeds’ growth processes, effectively killing them without harming desirable grasses.

Key Benefits:

• Broad-spectrum control of woody weeds like blackberry, gorse, and lantana.
• Compatible with spot spraying or aerial applications.
• Minimal impact on grasses, making it ideal for pastures.

Application Tips:

• Use during active growth periods for best results (typically spring and summer).
• Follow label rates carefully to avoid damaging non-target plants.
• Use with a wetter (like Wetter 600) to help the herbicide penetrate and work effectively.

Metmac Herbicide

Metmac is another reliable option for controlling woody weeds, particularly for thorny and thick infestations like boxthorn and gorse. It’s effective in both foliar and basal bark applications, ensuring flexibility in treatment methods.

Key Benefits:

• Penetrates woody stems and root systems for thorough control.
• Ideal for hard-to-reach weeds.
• Effective on mature, tough plants.

Application Tips:

• Apply as a foliar spray for leafy weeds or as a basal bark treatment for shrubs.
• Use with a wetter (like Wetter 600) to help the herbicide penetrate and work effectively.

Integrated Weed Management Plan

Using Associate or Metmac as part of an integrated weed management (IWM) strategy ensures long-term success. Here’s a step-by-step plan:

1. Identify the Weed:
   Correctly identify the species to choose the most effective treatment.
2. Assess the Infestation:
   Determine the size and density of the weed population.
3. Prepare for Application:
   • Use appropriate protective equipment.
   • Calibrate equipment for even herbicide coverage.
4. Apply Herbicide:
   Follow the label instructions to avoid over- or under-application.
5. Monitor and Follow Up:
   Check treated areas for regrowth and reapply as necessary.
6. Restore the Area:
   Replant with competitive native species or pasture grasses to prevent reinfestation.

Safety and Environmental Considerations

When using herbicides, always:

• Read and follow the product label instructions.
• Wear protective clothing and avoid spray drift.
• Apply during calm weather to minimise environmental impact.
• Avoid treating near waterways unless the product is registered for aquatic use.

Take Control of Woody Weeds

Woody weeds don’t have to dominate your landscape. With products like Associate and Metmac, combined with a strategic approach, you can reclaim your garden, pasture, or natural environment.

If you’re ready to tackle woody weeds, explore our range of herbicides and find the right solutions for your needs at The Garden Superstore.

Have questions about controlling woody weeds? Contact us at 07 5454 8822 or email sales@gardensuperstore.com.au.