How to kill manuka

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


Manuka description

Manuka identification

Manuka is a prolific scrub-type tree and is often one of the first native species to regenerate on cleared land. It is typically a shrub growing to 2–5 m tall, but can grow into a moderately sized tree, up to 15 m in height.

It is evergreen, with dense branching and small leaves 7–20 mm long and 2–6 mm broad, with a short spine tip. The flowers are white, occasionally pink, 8–15 mm (rarely up to 25 mm) diameter, with five petals and seen from late spring to early summer.

Manuka control

How to kill manuka

For control of manuka apply Grazon Extra at a rate of 500 mL/100 L of water and add Pulse Penetrant at 200 mL/100 L of spray. Thoroughly wet foliage, stems and soil around the base of the plants.

Where slashing has resulted in regrowth, allow at least one year’s regrowth or until regrowth has reached 1 m tall before treatment.

Herbicides for killing manuka

Product#Method of applicationRate*State
Grazon® Extra Herbicide Foliar spray 500 mL/100 L of water + Pulse® Penetrant Vic

# 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 manuka

Optimum control of manuka with herbicides occurs during the flowering growth stage (late spring to early summer).

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