If you are dealing with unwanted woody regrowth, the first decision is not simply "which herbicide should I buy?" The more useful question is: what treatment method suits the job in front of you?

Scattered saplings, freshly cut stumps, multi-stemmed woody weeds and broad areas of regrowth can call for very different approaches. TGRM stocks products for several of these methods, but the exact product must always match the target species, situation and current registered label.

Start with the job, then choose the method

A practical way to narrow the options is to first ask whether you are treating individual plants or a broader area of regrowth.

For individual stems or scattered plants, targeted treatments such as cut-stump, stem injection or basal bark can make sense. They allow the herbicide to be placed directly on or into the target plant and can reduce the need to spray surrounding pasture.

For larger areas of suitable woody regrowth, a soil-active granular product may be another option. That is a different treatment system altogether: it depends on the registered target, site conditions, soil and rainfall, and it can carry important restrictions around waterways, slope, desirable trees and future cropping.

Foliar spraying

Foliar spraying — applying the herbicide mixture to the leaves of the standing plant — is the method most people picture first, and for suitable regrowth it is often the practical choice. It works best on actively growing plants that are small enough to be covered properly; as plants get taller and woodier, coverage gets harder and the more targeted methods below start to make more sense. Grazon Extra is a widely used foliar option for woody and noxious weeds, and the current label sets the rate, timing and coverage requirements for each target. If your main target is lantana or similar woody weeds, our guide to controlling lantana and woody weeds covers the foliar product choice in more detail, and our before-you-spray checklist covers preparation, weather and drift.

Cut-stump treatment

Cut-stump treatment is used after a woody plant has been physically cut. The herbicide is applied to the fresh cut surface so that the remaining stump and root system can be treated before regrowth occurs.

Tordon RegrowthMaster and Access Herbicide are both current TGRM-range examples with cut-stump uses, but they are not interchangeable products. Their formulations, carriers, target weeds and label directions differ.

Cut-stump treatment can be particularly useful where the plant is already being mechanically removed or where foliar spraying would be difficult or could expose nearby desirable vegetation.

The key point is timing. Treat the fresh cut surface immediately — TGRM uses about 20 seconds as a practical working rule. The practical mistake to avoid is cutting a whole area first and coming back later with the herbicide; work stump by stump and treat while the cut is fresh. The exact product label governs the required application timing, mixture and technique.

Stem injection

Stem injection is another highly targeted method for suitable woody plants. Rather than cutting the plant down first, the herbicide is introduced into cuts or injection points in the standing stem according to the current label.

Tordon RegrowthMaster is specifically positioned by Corteva for stem injection and cut-stump treatment of woody regrowth. This can make it relevant where individual trees or saplings need to be treated but broad foliar spraying is not the preferred approach.

Stem injection is a method-specific treatment, not a universal recipe. The target species, stem size, application pattern and mixture must come from the current product label.

Basal bark treatment

Basal bark treatment involves applying the herbicide mixture around the lower stem or trunk of suitable woody weeds. Access Herbicide is a strong example of a product designed for this method.

Access is formulated to be mixed with diesel or, in appropriate environmentally sensitive situations, with Biosafe. It is not a water-mix product. Corteva also specifies low-pressure, very coarse application so the mixture streams or dribbles onto the target rather than being applied as a fine spray.

For suitable plants, basal bark can be a useful option where you want to treat the standing plant without cutting it first. As stem diameter increases, however, the current label may direct the user toward cut-stump treatment instead.

Why carrier choice matters

Carrier choice is one of the clearest reasons not to assume that woody-weed herbicides are interchangeable.

Access uses a diesel/Biosafe carrier system. Tordon RegrowthMaster is a different formulation and treatment system. Grazon Extra has its own registered methods and label directions.

If a product needs diesel, water, an adjuvant or another specific carrier, that requirement comes from that exact label. Do not copy the mixing method from a product with similar active ingredients.

Where Grazon Extra fits

Grazon Extra is widely used for woody and noxious weed control and can suit situations beyond the very targeted stem-treatment niche. It has a broad registered weed spectrum and multiple application methods depending on the target and label.

That makes it useful to keep in the decision set, but it should not be treated as a blanket substitute for Access, Tordon RegrowthMaster or another product simply because some active ingredients overlap.

Grazon Extra covers a broader registered woody-weed role and label-permitted application methods than the individually targeted treatments above. Check the current Grazon Extra label for the method that applies to your target and situation. If the job is a cut stump, basal bark or other targeted treatment, check which product is actually registered for the target and method before choosing.

When a granular treatment may make more sense

GP Regain 200 is different from the liquid stem-treatment products. It is a tebuthiuron granular herbicide registered for control of specified woody regrowth on grazing land by hand, ground and aerial application.

This type of product can fit broader regrowth situations where treating plants individually would be impractical, but it also brings site-selection considerations that are much more important than with a simple "which drum do I buy?" comparison.

The current Regain 200 label includes restrictions relating to recognised watercourses, steep land, desirable vegetation, future cropping and native-vegetation legislation. That means the property and treatment area must be suitable before the product is considered.

Before considering a granular option, look at the site before the drum: how steep the country is, and how close the treatment area sits to watercourses. The current label sets out where the product can and cannot be used — including distances from recognised watercourses and limits on slope — and the applicable rules can differ with your location and state requirements. On steep country or close to water, the label may rule the option out before price or convenience ever come into the decision.

It also relies on soil movement and root uptake rather than direct treatment of a cut or standing stem, so rainfall and soil conditions affect how the treatment works.

Drones and aerial application

Drone and other aerial herbicide application is becoming more common, particularly where regrowth country is difficult to reach with ground equipment. It is not simply a matter of putting the same spray mix into a drone: the product label must allow the proposed aerial use, and aviation, chemical-use, operator and drift-management requirements can apply. In Queensland, aerial-distribution licensing requirements depend on the activity and regulatory setting, so use a suitably authorised operator and check the current rules for the job. If you are weighing up drone or other aerial treatment for regrowth, talk to TGRM — we can put you in contact with reputable local contractors and help you match the discussion to the products and labels involved.

A simple way to narrow the choice

For a small number of individual woody plants, start by asking whether cut-stump, stem injection or basal bark is the most practical registered method.

If you are already cutting the plants, a cut-stump product may be the natural fit.

If the plants are standing and suitable for a targeted stem treatment, stem injection or basal bark may avoid treating the surrounding pasture.

If you need a broader woody-weed option beyond those individually targeted methods, keep Grazon Extra in the decision set and check its current label for the registered target and application method that fits your situation.

If the problem is broad regrowth over a larger suitable grazing area, a registered granular option may be worth considering, but the site restrictions become a major part of the decision.

Then identify the weed and check the label

Method selection is only the first filter. Before using any herbicide, identify the target plant as accurately as possible and confirm that the exact product label covers:

• the weed or woody-regrowth species;
• the situation or land use;
• the treatment method;
• the required carrier and mixing instructions;
• any withholding or export requirements;
• environmental and off-target restrictions; and
• any timing or plant-condition requirements.

Products with similar active ingredients can still have different registrations and directions. Generic or equivalent products should always be checked against their own current label.

What TGRM can help with

TGRM can help you compare the product formats and treatment methods we stock and locate the current label for the exact product you are considering.

Bring in a clear photo of the plant if identification is uncertain, along with an idea of whether you are treating scattered plants, fresh stumps, standing stems or a broader regrowth area. That gives us a much better starting point than choosing a product by brand name alone.

For questions about native-vegetation clearing laws, protected vegetation, land-clearing approvals or other legal restrictions, use the relevant Queensland Government or local authority guidance. Herbicide registration does not itself give permission to clear vegetation.

Always read and follow the current registered product label before use.