When Should I Apply a Pre-Emergent Herbicide?

26 September 2023

Pre-emergent herbicides are fantastic products to add to your lawn care regime. With these herbicides, your application timing can impact how well it will work to prevent weeds in your lawn. In this blog, we look at the optimal times throughout the year to apply a pre-emergent to get the best results.

How Does a Pre-Emergent Work?

Pre-emergents work by targeting weed seedlings during germination. They create a barrier at the soil level that affects the germination of any new seedlings. This means they will target weeds before they appear but will not be effective after weeds have started growing.

Why Should I Time My Application?

As pre-emergents work by targeting weeds before they appear, you will need to time your application just before weeds are set to start growing in your lawn. If you can create the barrier at the soil level before the weeds are set to start growing, you can stop them during their germination phase.

When to Apply a Pre-Emergent for Seasonal Summer Weeds?

Some seasonal summer weeds that pre-emergents will help target include Summer Grass, Crabgrass, and Crowsfoot. Seasonal summer weeds will start to germinate when the soil temperatures begin to warm back up, usually when the average soil temperature is above approximately 14 degrees. So, it is best to get your application down before the temperatures are set to rise in your region. The exact time for your application will change depending on your location and temperatures in your region. As a guide, this will usually occur around early to mid-spring.

When Should I Apply a Pre-Emergent for Seasonal Winter Weeds?

Pre-emergents can also be used to help prevent seasonal winter weeds, including Winter Grass. Seasonal winter weeds will start to germinate once the average soil temperatures start to drop below approximately 14 degrees. Therefore, it is best to get your application on just before this is set to occur. Like prevention for summer weeds, the exact time this will occur will depend on your location and temperatures in your region. As a guide, this will usually happen around mid to late autumn.

What Pre-Emergent Should I Use?

When it comes to using pre-emergents, we recommend using our Lawn Solutions Oxafert Pre-Emergent Herbicide and Fertiliser. Oxafert comes in a handy 3kg bag that will treat up to 100m2. It is safe for most warm season turf types, including Sir Walter DNA Certified, TifTuf Hybrid Bermuda, Sir Grange, Zoysia Australis and Kikuyu. This product also contains a balanced ratio of nutrients to help boost your lawn for healthier all-round turf. Oxafert will remain active on your lawn for up to 12 weeks, for protection of seasonal weeds.

What Weeds Will Oxafert Target?

Oxafert will help control the germination of Winter Grass, Summer Grass, Crowsfoot, Creeping Oxalis and Crabgrass.

What Should I Use for Weeds That Are Already Growing?

If you already have weeds growing in your lawn, it is best to get on top of them as soon as possible to help prevent their spread. Whem there are only a few weeds growing throughout your lawn, hand removal is an effective option. If the weeds are more widespread and there is too much to remove by hand you may need to look at using an herbicide for removal. For removing common broadleaf weeds like Clover, Bindii, Creeping Oxalis, Cudweed and Thistles, we recommend using a broadleaf herbicide like our All Purpose Weed Control.

As always, if you have any more questions please don’t hesitate to contact us for free expert advice on 1800ALLTURF (1800255873) or 07 5543 8304.