Best Brush Killer for Lawns and Gardens

Brush killers are herbicide products formulated to control woody plants, invasive shrubs, vines, and stumps that standard broadleaf lawn herbicides cannot effectively kill. The primary active ingredient in most brush killers is triclopyr, either as triclopyr butoxyethyl ester (oil-soluble) or triclopyr triethylamine salt (water-soluble), often combined with 2,4-D or picloram for broader spectrum control. Choosing the right brush killer product depends on the target species, the location, and whether you need selective or non-selective control.

What Brush Killers Target

Brush killers are designed for:

  • Woody shrubs and trees: Invasive species including multiflora rose, Japanese honeysuckle, blackberry, kudzu, privet, sumac, and tree of heaven (Ailanthus)
  • Stump treatment: Preventing regrowth after cutting woody plants by treating the freshly cut stump or basal bark
  • Vine control: Poison ivy, Virginia creeper, wild grape, and climbing invasives
  • Brushy field edges and fencerows: Areas where multiple woody species and aggressive perennial weeds coexist

Standard broadleaf lawn herbicides (2,4-D alone, mecoprop) are ineffective against most woody plants because the plant’s bark and woody tissue are not penetrated efficiently by these molecules. Triclopyr is specifically effective on woody species because it penetrates bark and cambium tissue and translocates through the vascular system to the root system.

Active Ingredients in Brush Killers

Triclopyr (Alone or Combined)

Triclopyr is the most important active ingredient in consumer brush killer products. It is a systemic, selective herbicide that is highly effective on woody broadleaf plants and many broadleaf weeds. It is absorbed through foliage, bark, and cut surfaces and translocates throughout the plant including to the root system.

Triclopyr amine salt (water-soluble): The standard form in consumer products. Mixed with water and applied as a foliar spray or basal bark spray. Less volatile than the ester formulation.

Triclopyr butoxyethyl ester (oil-soluble): The ester formulation penetrates bark more effectively than the amine salt and is used in professional basal bark and cut-stump applications where penetration through bark tissue is required. Available in some consumer products.

Triclopyr + 2,4-D Combinations

Many consumer brush killer products combine triclopyr with 2,4-D to extend control to both woody species (triclopyr’s strength) and a broader range of herbaceous broadleaf weeds (2,4-D’s strength). These combination products are the most practical for fence rows and field edges where both woody and non-woody broadleaf weeds are present.

Picloram + 2,4-D (Tordon RTU)

Picloram is a highly persistent soil-active herbicide that is extremely effective on deep-rooted woody plants including invasive trees. Tordon RTU is the standard consumer stump-treatment product using this combination. It is not appropriate for use near water or in areas where soil movement to adjacent planting beds or water courses is a concern, picloram persists in soil for months to years and can damage non-target plants through soil residue.

Best Brush Killer Products

Ortho MAX Poison Ivy and Tough Brush Killer (Triclopyr + 2,4-D)

Best for: Poison ivy, poison oak, blackberry, multiflora rose, and mixed brushy areas Format: Concentrate or ready-to-use Active ingredients: Triclopyr and 2,4-D amine

Ortho MAX is one of the most widely available consumer brush killers and covers the broad spectrum of common invasive woody weeds and vines. The triclopyr and 2,4-D combination provides both penetration of woody tissue and control of the herbaceous broadleaf weeds that coexist with brush species. It is safe to use near established turfgrasses when applied as a directed spray.

Application: Mix concentrate per label or use the RTU formulation directly. Apply to thoroughly wet all foliage of target plants. For dense woody shrubs, cut back to expose inner growth and apply to all cut and remaining foliage.

Spectracide Brush Killer (Triclopyr + 2,4-D)

Best for: Brushy field and property edges, mixed species brush control Format: Concentrate Active ingredients: Triclopyr amine + 2,4-D

A cost-effective alternative to Ortho MAX with a similar active ingredient combination. Appropriate for homeowners managing fence lines, property edges, and overgrown brushy areas where a larger-volume concentrate is more economical than RTU.

BioAdvanced Brush Killer Plus (Triclopyr + 2,4-D + dicamba)

Best for: Broadest spectrum coverage including perennial broadleaf weeds alongside woody plants Active ingredients: Triclopyr, 2,4-D, and dicamba

The addition of dicamba to the triclopyr and 2,4-D base extends the weed control spectrum to include clover, ground ivy, and other broadleaf weeds that may coexist with brush species. A good choice for areas where mixed woody and herbaceous weed populations need to be managed together.

Tordon RTU (Picloram + 2,4-D). Stump Treatment

Best for: Cut-stump treatment of invasive trees (tree of heaven, black locust, sycamore, privet) to prevent regrowth Active ingredients: Picloram + 2,4-D Important limitation: Not for use near water, gardens, or areas where soil movement to sensitive planting areas is possible. High soil persistence, follow label precautions strictly.

Apply to freshly cut stumps within a few minutes of cutting, coating the entire cut surface and outer ring of cambium tissue. Most effective when applied during active growing season (spring and summer) when the vascular system is actively moving fluids through the tree.

Application Techniques for Specific Situations

Foliar Spray

For actively growing shrubs and vines with accessible foliage. Mix and apply to thoroughly wet all leaf surfaces. Best in spring and early summer when plants are actively growing and translocating chemicals through the vascular system efficiently.

Basal Bark Treatment

For woody shrubs and small trees (up to 6 inches in diameter). Apply an oil-soluble triclopyr ester product mixed with basal oil (refined vegetable oil or penetrating oil) directly to the bark at the base of the plant, from ground level up to 12 to 18 inches. The oil-soluble ester penetrates bark and delivers triclopyr into the cambium and vascular tissue. No mixing with water.

This technique can be applied year-round including winter when foliar application is not possible.

Cut-Stump Treatment

For trees and large shrubs after cutting. Apply concentrated herbicide (glyphosate concentrate, Tordon RTU, or triclopyr ester) to the freshly cut stump surface immediately after cutting, within minutes. The cut vascular tissue actively absorbs the herbicide and translocates it to the root system. Delay of more than 30 minutes significantly reduces effectiveness as the cut tissue begins to seal.

Safety Notes

  • Keep brush killer products off turf grass and ornamental plants, triclopyr and dicamba can injure broadleaf ornamentals and some grasses at higher concentrations
  • Do not apply near water features or storm drains
  • Wear protective gloves, eye protection, and long sleeves during application
  • Observe the product-specific re-entry interval before allowing people and pets in treated areas