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What is the Best Pre-Emergent for Lawn Care Professionals?

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Part of mastering a perfectly manicured lawn is using a pre-emergent before the weeds show up. 

So which pre-emergent is the best to use?

And which type of pre-emergents should you be carrying on your truck?

Well, we have done a deep dive, and this is what we found about using pre-emergents effectively

Be warned! The answer isn't just what product is the best; it is also when to apply it for optimal results.

But we will cover all of that and more...

Let's dive in! 

Why Pre-Emergents Are So Important

Proper use of pre-emergents can help you make a pristine lush green lawn by getting rid of weeds before they emerge

For example, if you have a client with a Kentucky Bluegrass lawn, and you want to stop encroaching weeds like crabgrass. 

You can apply a pre-emergent to kill them before they ever show up!

How Pre-Emergents Work

Pre-emergents work in 3 different ways, they can inhibit:

  1. Plant root growth

  2. Seed cell division

  3. Or specific enzymes from developing. 

Unlike a weed-killer like Roundup, pre-emergents don't kill fully grown grasses. Instead, they work by targeting the seeds of weeds, by inhibiting root growth. Therefore, they can be sprayed on a fully grown lawn, and on a wide variety of grass types.

However, because many pre-emergents impact root growth, they may kill newly seeded lawns. 


For Best Results; Adopt a 2-Step Process

Most pre-emergents have a yearly maximum which you can apply to a lawn. So using a mixture of 2 different products can help you work around that limit. And help you get better results

While two applications may be more expensive than one, doing so will help you effectively fight off weeds, even crabgrass!

Step #1: Prodiamine- Barricade 

Prodiamine based pre-emergents, such as Barricade, are easily the most preferred pre-emergents among lawn care professionals. 

Here's the deal, while using both Prodiomine and Dithiopyr in a 2-step process is best. If you have to choose one as a lawn care professional, Prodiamine is the go-to

Pros of Prodiamine:

From a lawn care professional's perspective, Prodiamine-based pre-emergents are a go-to. While Prodiamine is thicker and more likely to gum up equipment, it will stay on the ground longer. Furthermore, it can be applied earlier in the season

Step #2: Dithiopyr- Dimension 

Is it too late in the season to apply Prodiamine? No worries, that's what Dithiopyr is for. Get this Dithiopyr can come in the clutch and kill crabgrass up to the 3-leaf stage

This late-stage action makes it a great product to use later in the season, as long as you get it down before the warmer weather. This characteristic of Dithiopyr, commonly known as Dimension, also makes it an excellent choice for a second application of pre-emergent.

Pros of Dithiopyr:

Dithiopyr is easier to apply because it is not as thick; furthermore, it will kill weeds, predominantly crabgrass, in later stages than Prodiamine can. 

These benefits make it a better option for homeowners looking to keep things simple and only use one product.


Apply Pre-emergents In Optimal Weather

The best time to begin to apply a pre-emergent is before the ground temperature is above 55 degrees. However, you want to avoid applying a pre-emergent when temperatures rise above 90 degrees

Here's the deal, microbes will quickly break pre-emergent products down. And because these microbes become more active in the warmer weather, pre-emergents will break down too fast in warmer weather to be effective

Furthermore, most weeds have already begun to emerge by the time the temperatures are that high. So they won't really be effective at that stage anyhow. When applying a pre-emergent, don't forget to pick a good granular fertilizer for the lawn.

When to Apply Pre-emergents in the North

In the North, you will likely want to apply Prodiomine around the time that the magnolias or crab apples are blooming, in the early spring

Then, especially if you have a big issue with crabgrass on the lawn. You will want to consider a second application of Dithiopyr just before summer in mid-May. This will allow you to get a second application in before the warmer weather. 

When to Apply Pre-emergents in the South

In the South, you will want to begin applying your first pre-emergent as early as mid-February. Again, the first application should be a Prodiamine based product.  

For the second, Dithiopyr-based pre-emergent, you will want to apply that somewhere in mid-May. Right before the warm summer weather rolls on in!

Pro-tip! Pre-emergents only kill what has yet to emerge and will not kill a weed that is already established. 

Poll: Prefered Crabgrass preventative of GreenPal Pros

The main aim of pre-emergents is to kill crabgrass before it grows, but with so many lawn care companies.  Each one will adopt a strategy of their own. 

Our poll shows that 46% of our lawn care pros prefer to use, High-Yield a Dithiopyr-based pre-emergent, making it the most popular crabgrass prevention product among GreenPal Pros. 

The second choice for crabgrass prevention among GreenPal Pros is a tie, at 18%, between BioAdvanced, and Barricade. BioAdvanced is not technically a pre-emergent, but it does target crabgrass, as well as dandelions. 

On the other hand, Barricade is a Prodiamine-based pre-emergent. While Prodiamine -based products are the #1 choice for many lawn care pros, GreenPal pros tend to prefer Dithyopyr

And tied for 3rd is Scott's HALTS and Specticle- FLO. Scott's is another crabgrass preventative that is not technically a pre-emergent but does kill crabgrass. And Specticle is a pre-emergent that uses a different active ingredient, Indaziflam.

Looking for an Organic Pre-Emergent?

There is one organic product that works surprisingly well as a pre-emergent—good ole' corn gluten

Corn gluten acts in the same manner as Prodiamine by inhibiting root growth in young crab grasses. Simply, spread corn gluten throughout the lawn very early in the growing season, and you can naturally hinder the growth of crab grasses. 

Pro Tip! This goes for all pre-emergents that are applied dry as well as cornmeal. Be sure to water the lawn after application, or the pre-emergent may not be effective.

The Best Pre-emergent At the End of The Day

While using a 2-step approach when it comes to a pre-emergent is best. If you have to go with only one for your lawn care operation. The resounding winner is Prodiamine. 

Whatever the case, if you are like me. You will take what you have learned here and use it to adapt a few strategies you are already working with. But rest assured, the 2-step approach comes highly recommended amount a spectrum of lawn care professionals. 

Now you can get busy treating your client's lawn but not before finding the best pair of workboats for a landscaper.

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