Is It Too Late For Pre-Emergent?


It’s mid-March, the clocks have sprung ahead and sundown is nicely after 7:30PM now. I’m already profiting from the extra yard time after work, getting some a lot wanted pruning carried out.


The times are longer too, virtually as much as a full 12 hours of day size! The extra daylight out there means the extra your grass can seize it for photosynthesis. That’s a set off for it to get up and begin rising.

Longer days additionally imply the soil is heating up and that’s what drives our technique for pre-emergents to cease crab grass. Soil temperatures inform us when to use prodiamine.


In case you have not already, go obtain my free pre-emergent information that gives you particulars on the technique total.


Soil Temperature Milestones

We do prodiamine “break up functions” in my methods. Cut up functions imply we apply 2 “lighter” functions of prodiamine in spring somewhat than 1 “heavy” remedy. I favor the break up functions technique as a result of it offers you a hedge in opposition to unexpected circumstances that would reduce the effectiveness of your software.

The primary software goes down as soil temperatures cross 50F heading to 55F and the second goes down as they rise previous 65F heading to 70F. As soon as soil temps move 80F the window closes and there’s no extra want to use.

(Questioning learn how to observe soil temps at your home? Get my FREE app – it’s soil temps in your pocket!)

50F – 55F Soil Temperatures

We are able to take a look at just a few areas throughout the nation which can be sitting within the good window to get that first software of prodiamine down. I’m trying on the 5 day common because the marker for the milestone. (that is carried out for you in my app)

Tulsa and Nashville are completely within the window now – time to throw down!

Norfolk and Louisville are proper there too – simply approaching the proper time to use, Thrower Down and hope for the very best!

Is It Okay To Be Early?

We had a major early warm-up in February and soil temps have been fairly heat. Many of us utilized their prodiamine then – is that okay? The reply is sure! Being early is completely high quality, particularly down right here within the south the place the bottom doesn’t actually freeze anyway.

Plus, with my technique, I’ve loads of redundancy in-built so in case you are early you continue to have loads of protection time.

Am I Late Then?

On the opposite facet of this equation are these of you who might imagine you’re late. For no matter motive you didn’t get your first software down proper because the soil temps have been good, and also you’re questioning “Am I too late then?”

The reply is: you aren’t too late.

Bear in mind, crabgrass seeds germinate at soil temps between 55F and 80F. That’s an extended window of time that lasts all spring. We wish to get 2 functions of prodiamine down inside that window.

In the event you’re a bit late and forestall 90% of the issue, that actually is healthier than stopping none of it. You observe that logic? Being a bit late continues to be performing some good!

The opposite factor about that’s that not the entire crabgrass seeds begin rising precisely on the similar time on the identical day. Some seeds could also be buried 3” down within the soil profile, others could also be 6” down, so the temps hit one ahead of the opposite.

Some areas within the shade could keep a bit cooler vs these within the solar. After which water penetration may be totally different as nicely. All of those elements imply that seeds are just about in any respect levels of development in the course of the spring window.

Soil Temps Crossing 65F heading to 70F

Now let’s look a bit additional south. Many people are arising on our second software of the season already! Appears loopy to most of you I’m positive however let’s take a look at the information.

Taking a look at Waco, TX and Montgomery, AL, you people are proper within the window to use your second software of prodiamine. In case you have not utilized any prodiamine but, it’s best to go forward and get began now. You probably did miss the primary one, nevertheless it’s higher to stop crabgrass from now onward whereas the spring window continues to be open. Bear in mind, stopping 50% of the crabgrass is healthier than stopping 0% of it. Throw’er Down!

Who’s Too Late for Pre-Emergent?

I’m right here in Bradenton, Fl – west coast of Florida simply south of Tampa Bay. My soil temps are hovering up over 80F the final a number of days. I’d say that in case you are residing right here the place I do, we are actually previous the window for prodiamine for the season. No want to use once more till the autumn time.

As a substitute, you’re finest to start out taking a look at submit emergent weed management to manage all of the weeds that you’re in all probability seeing!

Here’s a video I made displaying you learn how to combine and apply retailer purchased weed management.

I’ll see you within the garden!


Welcome to the lush world of gardens and nature with Katia, your dedicated guide on With a profound love for the natural world and a deep-rooted connection to all things green, Katia is your trusted companion in unraveling the beauty, science, and serenity that encompass gardens, plants, trees, and the great outdoors. Katia's journey is one of exploration and environmental appreciation, driven by a genuine fascination with the intricate ecosystems that thrive around us. Her articles are a harmonious blend of informative insights and heartfelt storytelling, capturing the essence of the botanical wonders that shape our surroundings. Drawing from a rich tapestry of horticultural knowledge and a desire to inspire environmental stewardship, Katia's writing takes you on an immersive journey through gardens of all sizes, plant species, and the delicate balance of nature. Whether she's delving into gardening tips and techniques, unveiling the unique qualities of different plants and trees, or celebrating the restorative power of nature, Katia's words paint a vivid portrait of the world outside our windows. Beyond being a dedicated chronicler of nature's splendor, Katia is a community builder. She recognizes the importance of creating a space where fellow nature enthusiasts can come together to share experiences, exchange gardening wisdom, and collectively celebrate the beauty of the outdoors. Join Katia in exploring the enchanting world of gardens, plants, trees, and nature's wonders on Embark on a journey that celebrates the intricate connections that sustain life on Earth, and let Katia's passion ignite your own appreciation for the verdant tapestry that surrounds us.

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