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Turf Culture

Odessa Herbicide (onion weed treatment)

Odessa Herbicide (onion weed treatment)

$98.00
$98.00
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For those battling the dreaded Onion Weed + a variety of other grassy and broadleaf weeds Odessa is an ideal option that is safe to use on Couch, Hybrid Couch, Buffalo and Kikuyu lawns.

Odessa Herbicide is registered for the post-emergent control of various difficult to kill grass and broadleaf weeds such as;

  • Bindii (Soliva sessilis),
  • Black thistle (Cirsium vulgare),
  • Cat's ear (Hypochoeris radicata),
  • Cotula (Cotula australis),
  • Cudweed (Gnaphalium sp.),
  • Guildford Grass (Onion Grass) (Romulea rosea),
  • Medic (Medicago spp.),
  • Mouse ear chickweed (Cerastium vulgatum),
  • Oxalis (Oxalis corniculata),
  • White Clover (Trifolium repens),
  • False onion weed / Fragrant false garlic / Onion weed (Nothoscordum gracile, fragrans or borbonicum)

Odessa Herbicide allows turf managers to control the various difficult weeds that other herbicides have struggled to manage such as Guildford Grass (Onion Grass) (Romulea rosea) in Common Couch, Hybrid Couch, Buffalo or Kikuyu turf stands.

Features & Benefits

  • Outstanding post emergent control of difficult to kill weeds Onion weed, Guildford grass (Onion grass)
  • Excellent Turf Tolerance on Common Couch, Hybrid Couch, Buffalo and Kikuyu (DO NOT use on Queensland Blue Couch)
  • Selectively controls of Ryegrass out of Common Couch, Hybrid Couch, Buffalo and Kikuyu
  • Controls a unique scope of difficult to kill weeds
  • Low odour
  • Low poison schedule (Schedule 5 - CAUTION)

Application Rate

  • 0.25 to 1.5g per 100 square metres

Brochure

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Frequently Asked Questions

What is Odessa Herbicide used for?

Odessa Herbicide is a selective turf herbicide designed to control difficult weeds such as onion weed (false garlic), Guildford grass (onion grass), oxalis, clover, bindii, and other broadleaf and grassy weeds in established lawns.

Why is onion weed so hard to kill in lawns?

Onion weed grows from bulbs underground, which allows it to regrow even after mowing or pulling. Effective control requires a herbicide that penetrates into the bulb system rather than only treating the visible foliage.

How does Odessa Herbicide work on onion weed?

Odessa Herbicide works systemically, meaning it is absorbed through the leaves and transported down into the bulb or underground storage structures. This allows it to kill onion weed at the source instead of just removing top growth.

Is Odessa Herbicide safe for my lawn?

Odessa Herbicide is safe for most established warm-season turf grasses such as couch, kikuyu, buffalo, and hybrid couch when used according to label directions. It should not be used on Queensland blue couch.

Can Odessa Herbicide kill onion grass (Guildford grass)?

Yes, Odessa Herbicide is specifically effective against onion grass (Guildford grass). It is designed to target both the foliage and the underground bulb system, making it one of the more effective selective options for this weed in turf.

How do you apply Odessa Herbicide for onion weed?

Odessa Herbicide is applied as a foliar spray using a calibrated sprayer. Even coverage of actively growing leaves is important. For best results, follow label rates carefully and avoid over-application.

When is the best time to treat onion weed with Odessa Herbicide?

The best time to apply is during active growth, typically in autumn through early spring. This is when onion weed is most actively transporting nutrients to its bulb, allowing better herbicide uptake.

How long does Odessa Herbicide take to work on onion weed?

Odessa Herbicide works gradually with full control sometimes taking up to 4–6 weeks depending on conditions and weed maturity.

Do I need a wetting agent with Odessa Herbicide?

Yes, a surfactant (such as Wetter 600) is often recommended to improve leaf coverage and absorption, especially on waxy or upright weeds like onion weed.

Can I pull onion weed out instead of using herbicide?

Hand pulling is not effective because bulbs often break off underground and regrow. This is why systemic herbicides like Odessa are preferred for long-term control.

Is Odessa Herbicide rainfast?

Yes, once fully absorbed, Odessa Herbicide becomes rainfast. However, avoid watering or rainfall immediately after application to ensure the herbicide has time to dry on the leaf.