When To Apply Prodiamine Pre-Emergent Weed Preventer Herbicide + Lawn Care Tips 

First off, I've watched a lot of your vids. So today when I was watching Chris D'Elia's podcast and saw your name I nearly choked. Ha, he calls out a comment you left on one of his videos. It's Episode 105 at 35:56.

Fifth Thanks for making your plans and videos based on soil temps rather than time of the year. This makes your content relevant for every region.

Can't help but really appreciate all the awesome detailed info you constantly put out for us DIY people. I've learned so much and continue to learn from you even after 4 years. Keep up the awesome work Allyn. Supporter for life 4 sure!!

Nice job Allyn! Just be glad your not sitting under snow!

👍 The videos and weekly newsletters are very helpful for implementing a pre-emergent and post-emergent plan!

Just wanna say thank you allyn. Your tips and ideas sure had worked for me.

You're killing me 🤣. A cup of ice water is much easier. Temp is always 32 degrees but I still enjoyed your version.

Soil temp is right around 29. I wonder what -40 wind chill will do this week? Are you sure you don't want to visit? 😉

Alan, Thanks for all you do the information you provided along with Dic are going to be blended lawn program. Here in northern WV Thank Again.

Loved listing to this while cleaning up fallen sticks on the fields in low 30 degree weather. Come on spring! And remember kids to keep your tip and shaft clean.

This topic is sooooo right on time.

LCN You can also calibrate using the boil method at 212F. And try to keep your “tip” from bottoming out. Just another method then you don’t have to try to freeze a beer. 👍🏼

Just threw down my first ever app as a new homeowner. Scotts turf builder with crabgrass preventer, active ingreient is Pendimethalin. Don't have a clue what I'm doing but I hope it prevents thistles, last summer they were out of control.

Would love to see more stuff on Centipede

I have been studying the prodiamine 65wdg 5 lb. I bought way to much I have found! But I live on a lot of land in which I mow. So I just measured some sections and am trying to figure out how much prodiamine to use per gallon. If zone a is 12,239 sq ft and zone b is 12980 sq ft and zone c is 11,050 sq ft and zone d is 1,742 sq ft. Also, I timed my sprayer like you said in one of your vids and did the math. I came up with 1:56 to spray one gallon per 1k sq ft. Thank you for your help Alan, I one day hope to have the knowledge you possess! Love your vids!

The forecast high temp this Wednesday in Chicago is -12 with a low of -25. That is without the windchill.

Love the soil temp talk! I started logging mine past 2yrs. It fluctuates with the nightime lows more than the highs here in coastal CT. Right now 4 inches deep its 32.5°. So frozen couple inches. Last year didnt hit 55° until end of April. (Cold & Snowy spring)

Love those drawrings over by der

Interesting note, up here in Michigan, Lowes is offering Sta-Green Crab Ex in a blue bag and it’s .38 Prodiamine with a 30-0-6 fert onboard for $45.00 (50 lb/15,000 sq ft)

Last year I got into your channel and bought my chems...looking forward to this season. ROUND 2

For your under-21 crowd (this means you, Jake The Lawn Kid!): Fill a glass with ice cubes, then add just enough water to cover them. Insert manual thermometer and read temperature. Adjust to 32° F, the temp. of ice water. This is how we do it in restaurants. When adjusted, drink the still -non-frozen beer at your leisure.

Love this style of vid Allen! Nice work and really appreciate the content.

sup Alan, just placed an order with you at yard mastery for some prodiamine! thx for the good app, pdfs, and videos!

Thank you for doing this with typical big box brands! I literally was looking for what I need to buy pre emergent wondering if the big box store stuff was good enough (not like my yard is that baller... yet).

Hey @The Lawn Care Nut, ever thought about making a visual calendar for the N-EXT products and such, kind of like DoMyOwn has? It would be a swell addition to the new guides coming out soon.

So many potential jokes at the end of this one. 😂

Long day at for for me today, but had great and learned entertainment! Many thanks for the tips and walk through at the box store.

When you put your hands around the sterilized shaft, it's natural that the temperature rises.

You can also calibrate it by putting it close to your thermostat on your HVAC system

TIL a 5.6% ABV beer is a "real heavy viscous beer"... You're a funny guy Allen

LCNs Ace hardware has the Sunniland weed control for $11.99 at least in my area of Melbourne FL sale is for the month of February

Get a Thermowerks Thermopen MK4 that you can use for BBQ, in the kitchen and the lawn. It's accurate to +/-0.7° at only takes 1-2 seconds to hit temp.

This was great. LCN getting back to his... roots.

5% ABV Beer doesn’t freeze until 26° FI 🤔

Yeah it's definitely super cold down there. No growth at my grandma's lawn in Naples!

Have you ever looked at corn gluten as an organic pre emergent? It also has some nice fertilizer NPK to kick start the lawn in spring. Just wondering what kind of weed control I can expect vs the chemical options you mention. I first found the LCN site from your hybrid organic strategy. With small kids running around my lawn all the time I'd like to try organic wherever possible

LCN is a true Baby, meet you at the log cabin bro!

LCN....we always used ice saturated water in a glass container and letting it sit for 20 minutes .... temperature should be 33° we use this method to calibrate our thermometers when doing automotive air-conditioning work.

2020... right before spring weeds germination (feb-march) I put out Scott's "Step One" pre emergent with "crab grass preventer "(pre emergent).. and it completely solved my spring weeds & crab grass infestation I had for many years and just let it go.... St. Augustine lawn, E. Tx piney woods region.... Buy and put it out last week of Feb - first week or 2 of March here..... IT WORKS.... Interestingly the Step 2 bag said not for St. Augustine lawns but the Step One bag didn't hurt my lawn in the least.... in the last week of April after main germination, I put out the cheap Expert Gardener Walmart brand of 'Weed and Feed'... It kicked butt man! only 2 things it didn't kill and they were a grassy type of weed..... For the first time in many years I didn't have a lawn full of little flowers sticking up (Weed flowers lol) or clover and all kinds of salad mix mess junk.... I told my neighbor "You spend all that money on lawn care and you don't have any pretty flowers in your lawn. Look at my lawn, I got all kinds of colors of pretty flowers." He said " You ain't right in the head man..." ha (he's such an ass.......)

Great content man, and entertaining as always. thanks for the video!

Just use a glass of ice water. Water starts to freeze or starts to thaw at 32 degrees. Best and fastest way to calibrate.

Glass of ice water then set it to 32° Fahrenheit, give it about 5 minutes then recheck and adjust again if needed. Great video allen. I have a question for you sir. I want your honest opinion aside from what sponsors want you to say. Humic acid(granular) humic acid dg, or humic12 luquid? Thank you sir! Long time subscriber since 2016.

Great episode! Loved to big box comps

Awesome Vid, thanks my friend :)

All in fun…. I was gonna subscribe until I saw the corona box…. Then you spilled some calibrating the thermometer. Killian’s Red is where it’s at.

Allyn, on calibrating the Accurite thermometer I thought you said there was a calibrating screw on the backside, but you adjusted the nut instead. Isn't the nut there to hold the probe tightly and it's not to be used for calibration? Also, I would guess that your digital thermometer needs calibrating from time to time too so it won't be reliable all the time for calibrating other thermometers. However, in the soil we are talking "ballpark" temperatures so exact measurements are not critical. Thanks, Allyn, for this video on pre-emergents and the thermometers. I always learn a lot from you so I am looking forward to your next video/e-mail.

Please fill a glass with all ice. Put the temp probe down in the glass. Cover with a kitchen cloth for about 5 min. Go back and the thermometer should read 32. If not then you make adjustments.

Fortunately, you have enough material remaining from Publix to conduct another thermometer test. Then you should test it again to make sure you get the same reading. Try it with and without salt (salt may raise the temperature). Sorry about the cool temperatures in your lawn.

Sitting at a steady 42 soil temps degrees outside of BOSTON

ya sup Lawn Care Nut. I got your RGS and other NEXT from your site but I feel like I did it again. Warm March is bringing up the ground to 55 degrees so instead of waiting for my scale I just eyeballed the prodiamine. Now I have the scale and see I used to much and I read to much will nullify and negate the prodiamine leaving me no protection. But maybe if the soil heats up fast to 55 degrees the prodiamine I just put in will kill some of the seeds.......I completely forgot and didn't know I needed a scale as the prodiamine doesn't come wiht a measurement tool

You mentioned the Scott's Bonus S being pre and post. I have already have some and Wondering when I should be getting that down? In Orlando. Thanks!

Great info as usual - love your vids! I always have to check label for herbicides for pets. I have 2 small dogs and let them out in the yard. So.... PPE for me and "read the label" as you always say for... everything else, like pets, etc.

My Patience ran out. I drank the beer

You know Allyn after I twist the nut I usually put the shaft in the shower stream to test its accuracy!

Because something is good for St. Augustine does not mean it's good for Floratam (st. aug variant). Put down Spectricide with diathopr on my entire floratam lawn, the blades are thinning. Read the labels as small as the text may be.

Please make a video on how to identify what kind of grass a lawn is. I bought my place last year and have no idea what my grass is

I like your methods of testing temperature! Makes me thirsty 😎🍻

Hi LCN, We are a lavender farn in North Arkansas. Last year Crabgrass and other weeds almost killed us. Pro65 will kill 90% of these weeds. However, we are working with other factors a residential lawn owner doesn't have. Our lavender is planted in rows on raised beds with a Sunbelt weed fabric and a 2-3" layer of limestone gravel. From what I understand there is no issue using Pro65 around our lavender. My question is concerning time. We absolutely wont have time to weed this year. So should we apply at .183/1000ft @ 3 months or 2 months? I wasnt sure if we could get away with more chemical longer since we arent working with a lawn, and our season goes past Labor day. (Any weeds will be visible popping up through the gravel) Thank you for time and experience. Lagrange Lavender.

I live in SW Michigan, my lawn renovation germinated on JULY 19, 2021 will i be able to use Prodiamine for the first time this fall when ground temos hit 70 degrees? (I dont know how much time must pass to be safe.)??

Is it weird that every time you talk about soil temps at 55 degrees I hear the Sammy Hagar song "I can't drive 55"....haha

I live in Jacksonville Fl. I have been in for 6 months I have baha'I grass they had a tree up front I had it dug up and I fill they space in with st Augustin and it spreading what type of fall fertilizer should I use one for St Augustin or bahai

I am in south Florida I have Broad leaf weeds long deep roots, wild grass that runs it have seeds like nut edge grass. How can I get rid of them.

I just installed zoysia a week ago(mid September) Dallas,Texas. Is it advisable to use fertilizer at this point together with pre emergent. The sod supplier advised me not to use any synthetic fertilizers I'm confused because I see my zoysia struggling in some parts of the yard. Please help..

Sterilize that dirty shaft before you stick it in "O'ver By Der" in my best Allen Hayne voice. Anyways, thanks for all the years of information, joy, and jokes! You keep me going Allen!

I may go by Lowe's and do my own snooping, specifically the amounts of active ingredient in the store brands. The Sta-green product with dithiapyr was interesting, but if I have to double the strength it may not be the deal it seems on the surface. I've used the Lesco 0-0-7 for years but want to switch things up this year.

I am doing a split application of prodiamine 65 wdg, 1st one at 55 deg. soil temp and then i put down Lesco fert. 24.0.8 2%fe. my question is how long after i put down the Lesco can i do my second app. of prodiamine 65 wdg? should i wait?

I love the empty beer cans at the end and the humour getting a bit cheekier . When are are going to have an intoxicated LCN video ?

Thanks for shopping Publix.

Does this Pre-Emergent cover more then crabgrass? I don't have any issues with crabgrass in my lawn but I do have issues with clover and dandelions.

so, let me get this straight. You can either do pre-emergent with it in your fertilizer or you can do pre-emergent by itself like incase your using milorganite which does not have pre-emergent in it?

Man goes out to buy fertiliser, brings home beer

I started some Zoysia last season with plugs, they did very nice for the 1st year. My lawn is mostly Bermuda and would like to know what would be the best to keep the muda out of my zoysia for this coming year? Thank you

I think length of days has something to do with it. I'm In central Florida we start loosing leaves in mid August, when it's still brutally hot.

Good content man.

Hey Allyn seen on the diy channel that if you take high temperature and low temperature for a day add them together then divide by 2 for three individual days then add together the three numbers you got from the individual days then divide by 3 that would be your soil temperature just curious if that would be accurate

Been waiting for a revised video on prodiamine wdg cause people online don't really have a consensus on app rate longevity of protection

I live near Nashville TN. Is there a book or calendar you could recommend that would provide a schedule of what to use when?

Where can I find pre emergent and fungicide that will ship to Alaska.

I had 7000 ft of crabgrass last few years, but nuked it and have new fescue/kbg blend. I don’t want the crabgrass to return, I know there’s seeds in that soil still. I’m going with prodiamine first, but I want maximum efficacy. Which is the better way to go for assurance....spray or granular

Hello, greetings, I would like to know when is the first date of the year to put prodiamine, between February and March or right now? I would like your help.

I just put down my prodiamine app from the bag i purchased off your site. I also put down an app of Milo. Im up here in Chicago and my question to you is, do those two apps have any effect on when I can start spot spraying some dandelions that I already see popping up?

Name of reggae band diving to Lowes please? I gotta mow to this!

Lcn will you ever test out some of those potting soil testing thermometers for ph and such. Just curious if they work at all. I know there's no replacement for a proper soil test.

May I ask what time of day to take temperature ?

This helps me a lot!!!!

*Don't they have corn based pre-emergent where you live? I thought you were into organic lawns, it's also the only legal option for Canadians, herbicides were banned a few years ago.*

Do you know a date when your pre-m will come out? Both options on domyown are sold out now. I want to be sure I’ll be able to get some in time to put it down here in north central Texas.

Hey, if you guys have smaller lawns and need less then 5lbs of prodiamine, there are 8oz packs available on ebay. I've got just over 1000sqft and would of never been able to use 5lbs with prodiamine within its 2yr expiration.

So can i put down prodiamine any time if i just did milo last week? My soil temp is still below 60F. Sorry if you have already answered this elsewhere i just haven't seen anything on it yet

Have you ever heard of Fertilome? I would love to hear your insight. My guess if you like Scott’s Southern Lawn S you may have something good to say about Fertilome. A friend as been recommending it all last year and I’m thinking of doing it this year.

Can you do prodiamine in late winter in South Carolina on St Augustine grass?

Hey Allen, so I applied my first application of pre-emergent on February 19, but we have been getting exaggerating rain totals in California, should I be concerned about the product getting washed out.

Can I just use a meat thermometer?

do I go by the 5 day average with the greeencast temp map? I am at 49.8 right now so I think I am just about ready to apply here

Which granular prodiamine should I get this year? See a couple options on domyown with potassium added.

Hey Allyn, you never mentioned anything about Prodiamine..only the Aztrine, I'm confused on which product to use on my St.Aug in Tampa Fl.

Thanks Allyn💪💪💪💪💪

Will this work for Carolina Geranium?

What is the conversion formula to take "pretty good" to "ish" I coverted to "ish" a couple years ago and it has been life changing.

I bought hiyield-weed-and-grass-stopper-with-dimension-herbicide, that should be OK for pre-emergent control of crabgrass?