How to kill blackberry

Access all the information needed for control of this noxious weed, including weed identification, herbicide application and spray timings.


Blackberry description

Blackberry identification

  • Blackberries commonly form dense thickets that may grow more than 2 m tall and cover large areas.
  • The plant has prickly stems or canes that grow from a perennial crown up to 150 mm in diameter.
  • The canes may be erect, arching or trailing and can reach 6 m in length.
  • Leaves consist of three to five separate leaflets, are dark green on the upper side, whitish underneath, and usually bear hooked thorns on the leaf stalks.
  • Partially deciduous it sheds leaves in winter.
  • Flowers are 2–3 cm in diameter, white or pink in colour and are formed in clusters at the ends of the branches.
  • Fruit change colour from green to red to black, each containing one seed.

Blackberry control

How to kill blackberry

Blackberry is a weed of national significance and is identified as being invasive, having the potential for widespread environmental, social and economic damage. Landowners and land managers at all levels are responsible for actively managing this weed.

The best time to treat for control of blackberry is from January through to March, although if conditions allow treatment can be as early as November and December, or as late as April and May.

Recommended treatment is with Grazon Extra using a foliar spray application at a rate of 350 or 500 mL/100 L of water. This method can used in any Australian state or territory.

Herbicides for killing blackberry

Product#Method of applicationRate*State
Grazon® Extra Herbicide Foliar spray 350 or 500 mL/100 L of water All
Garlon® 600 Herbicide Foliar spray 170 mL/100 L of water All
Tordon® RegrowthMaster Foliar spray 500 mL /100 L of water + adjuvant All exept NT
Grazon® Extra Herbicide Aerial spray 10 L/ha (apply in 200 L water/ha) ACT, NSW, NT, Qld, SA, Vic, WA
Garlon® 600 Herbicide Aerial (helicopter only) 4.8 L/ha (apply in 200 L water/ha) NSW, SA, Tas, Vic, WA
Garlon® 600 Herbicide Aerial (helicopter or fixed) 4.8 L/ha (apply in 200 L water/ha) Qld
Garlon® 600 Herbicide Controlled droplet application 170 mL/1 L of water All
Grazon® Extra Herbicide Controlled droplet application Apply undiluted All
Grazon® Extra Herbicide Gas gun application 335 mL/10 L of water All
Vigilant® II Herbicide Cut stump Apply neat: 3–5 mm layer All

# Note: Preferred product option in bold. * Consult label for details of growth stage and use, especially where range of rates is given.

Treatment timing

Timing to kill blackberry

Grazon® Extra Herbicide
Key: Best time to spray/treat Can spray/treat if conditions are suitable Do not spray/treat