Spot weed spraying on a grass lawn


Weeds are a common nuisance that can cause significant damage to agriculture industries, the natural environment, livestock, human health, and people’s livelihoods and weed spraying is a common and effective method employed to combat this menace.

In Queensland, invasive plants, commonly known as weeds, are regulated under the Biosecurity Act 2014. Landowners, including state and local governments, have the responsibility of controlling weeds on their properties. However, the cost of weeds goes beyond direct control and management expenses, including competition with pasture species, toxicity to stock, competition with crops, increased stock mustering costs, loss of ecotourism values, and the impact of aquatic weeds on water quality and irrigation. 

In this comprehensive guide, we will explore various methods to effectively control weeds on your property and explain how this can benefit your business. We will delve into the laws and regulations surrounding weed control, discuss the types of invasive plants, and provide strategies for managing and eradicating weeds. By understanding the best practices and timing for weed spraying, you can mitigate the risks associated with invasive plants and protect your property.

Understanding Weed Control Laws

Under the Biosecurity Act 2014, landowners are obligated to take all reasonable and practical steps to minimize the risks associated with invasive plants under their control. This is known as the general biosecurity obligation (GBO). While large acreage landowners can seek support from local government and Biosecurity Queensland for invasive plant control, they – and their residential counterparts – may also face enforcement of their responsibilities if necessary.

There are two categories of invasive plants: prohibited and restricted. Prohibited invasive plants are not present in Queensland and would seriously threaten agriculture industries, the natural environment, livestock, human health, and people’s livelihoods. If you spot a prohibited invasive plant, you must report it to Biosecurity Queensland within 24 hours and take appropriate steps to minimize its spread until receiving advice from an authorized officer.

Restricted invasive plants, on the other hand, are already established in Queensland and pose significant threats. These plants fall under different categories, and specific restrictions apply to each category. Category 2 plants must be reported within 24 hours, Category 3 plants must not be distributed or released into the environment, Category 4 plants must not be moved, and Category 5 plants must not be kept.

Benefits of Proactive Weed Management

Taking a proactive approach to weed control is crucial for preventing the spread and impact of invasive plants. Waiting for problems to occur can be costly, both in terms of financial resources and long-term damages to your property. By implementing a weed management strategy early on, you can plan your activities, allocate a budget for weed control, and minimize the risks associated with invasive plants.

When deciding on a weed management strategy, it is essential to gather information about the size of the problem on your property, the associated costs, and the available control methods. Conducting a cost-benefit analysis can help you determine the most cost-effective strategy for your business. Let’s explore some of the broad strategies for weed control:

Woman holding weeds removed from garden

Planned, Ongoing Management

Planned, ongoing weed management strategies require significant initial and ongoing costs. However, these strategies deliver long-term benefits by reducing weed incursions and impacts. By implementing regular monitoring, early detection, and targeted control measures, you can effectively manage and control weeds on your property.

Local Eradication

For smaller properties with well-defined weed problems, local eradication strategies may be suitable. Although local eradication has high initial costs, ongoing monitoring is the primary requirement. If successful, local eradication can provide long-term benefits and prevent further spread of invasive plants.

Selecting the Right Time to Spray

Choosing the optimal time to spray weeds is crucial for achieving effective control. Factors such as weather conditions, growth stage of the target plant, and leaf area play significant roles in determining when to spray. It is essential to gather accurate information and follow recommended guidelines. Here are some considerations:

Weather Conditions

Weather conditions greatly influence the success of weed spraying. It is important to choose a day with minimal wind to prevent the spray from drifting off target. A gentle breeze blowing away from sensitive crops, neighboring properties, waterways, or houses is ideal. Avoid spraying before rain is forecasted, as it will wash away the chemical and render it ineffective. Additionally, extreme heat can reduce a plant’s capacity to absorb herbicide.

Soil Moisture

The moisture level of the soil is another crucial factor to consider. Weeds should be sprayed when the soil is moist but not wet to avoid waterlogging or dry conditions. Damp soil also minimizes dust on weeds, which can reduce the effectiveness of sprays.

Growth Stage and Leaf Area

The growth stage and leaf area of the target plant are important considerations for effective weed spraying. Most annual weeds are most susceptible to herbicides when they are young and actively growing. Spraying at this stage requires less herbicide for maximum effect. For perennials like blackberry or gorse, it is beneficial to remove dead material before spraying to allow for better absorption of the herbicide. Accurate application of the spray mix to all actively growing foliage is crucial for success.

Man weed spraying using proper safety precautions

Responsible Chemical Use and Safety

When it comes to weed spraying, responsible chemical use is of utmost importance. Proper handling and management of chemicals ensure personal and environmental protection. Always refer to the labels on chemical containers for instructions on how and when to use each chemical. Pay close attention to timing, rates, and safety guidelines provided on the labels.

It is essential to discuss your spraying plans with neighbors to minimize any potential risks or inconvenience. Removing children, pets, toys, and pot-plants from the area to be sprayed ensures their safety. If you are uncertain about spraying safely and efficiently, consider hiring a licensed spray contractor or pest control operator.


Controlling weeds is a critical aspect of maintaining the health and productivity of your property. By understanding the laws and regulations surrounding weed control, implementing proactive management strategies, and choosing the optimal time to spray, you can effectively manage invasive plants and protect your business. Responsible chemical use and safety measures are essential to minimise risks to personal and environmental health. Remember to consult the labels on chemical containers and follow the recommended guidelines for best results. Or better yet, engage the professionals at Turftek to take care of all your weed spraying needs. With proper weed management practices, you can mitigate the impact of weeds and safeguard your property for years to come.

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