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Recently redid a garden bed and didn’t put down weed barrier. Can I lay down preemergent?

Posted on 6/22/24 at 12:01 pm
Posted by thatoneguy
Baton Rouge
Member since Apr 2014
603 posts
Posted on 6/22/24 at 12:01 pm
I read some things that said they don’t recommend weed barriers under mulch as it can impede oxygen flow and stupidly listened. Even with a 4-inch layer, multiple weeds are popping through.

Would preemergent hurt my bushes? I only put down a few young azaleas, nothing else. I’d rather not rip up the mulch and restart if I can avoid it.
Posted by Sir Saint
1 post
Member since Jun 2010
5469 posts
Posted on 6/22/24 at 1:07 pm to
quote:


I read some things that said they don’t recommend weed barriers under mulch as it can impede oxygen flow and stupidly listened.


Don't beat yourself up man. Weed barrier is a total waste of money and time IMO. In my experience, weed barriers do absolutely nothing. The weeds either grow through the barrier, or germinate on top of the barrier and grow anyway, just to frick with you.
 
I'll let some of the pros comment on pre-emergents. I know the basics for lawns but not specifically for flowerbeds. I've used dimension in my beds with mature azaleas without any problems, but not sure with young azaleas. You're probably too late in the season for pre-emergents to do anything though.
Posted by Dallaswho
Texas
Member since Dec 2023
3380 posts
Posted on 6/22/24 at 1:28 pm to
That’s how I feel. Other than spurge and sedge, not many weeds pooping up around here this time of year. Maybe over there. Bermuda grass is our biggest bed concern and it doesn’t care one bit if you laid down a barrier or not.
Posted by Daponch
Da Nortchore
Member since Mar 2013
1129 posts
Posted on 6/22/24 at 2:25 pm to
You have to determine if the preemergent that is labeled to control your weeds will be harmful for you plants. The label on the preemergent is your guide. Thick pine straw mulch is your freind. Increased rainfall this summer has been working against you
Posted by thatoneguy
Baton Rouge
Member since Apr 2014
603 posts
Posted on 6/22/24 at 3:14 pm to
quote:

Bermuda grass is our biggest bed concern


Luckily we have St. Aug in the front yard, so no need to worry about that. Will keep that in mind for the back yard though when we redo it
Posted by cgrand
HAMMOND
Member since Oct 2009
46423 posts
Posted on 6/22/24 at 3:40 pm to
pull the weeds by hand or spot treat with 30% vinegar and dawn soap. They’ll be dead in the morning

there is no such thing as a 100% weed barrier. The seeds were already there when you turned the soil
This post was edited on 6/22/24 at 3:42 pm
Posted by Tree_Fall
Member since Mar 2021
1082 posts
Posted on 6/22/24 at 4:43 pm to
Weeds are a big part of Baton Rouge gardening. Whenever I see a weed-free garden here, I think of all the work it requires.

My advice is to keep beds few in number and incorporate dense shrubs that don't let the sun hit the ground. Follow directions on pre-emergents. They do slow the attack.

When you prepare a bed (weed, turn, incorporate organics) don't mulch immediately. Rather, let it lay bare and water daily for a week. That will germinate the seeds in the topmost layer... you may be amazed. Then hit with RoundUp-type herbicide or scrape away as shallow as you can with a hoe. When all the sprouts are dead/gone, plant bedding plants and mulch.

BTW, weed cloth under gravel does slow the process of the gravel paths mixing with dirt.
Posted by Cutloose
Nela
Member since Mar 2019
46 posts
Posted on 6/22/24 at 7:37 pm to
I hear a layer of cardboard is the way to go
Posted by tonydtigr
Beautiful Downtown Glenn Springs,Tx
Member since Nov 2011
6413 posts
Posted on 6/24/24 at 6:25 am to
quote:

I hear a layer of cardboard is the way to go


There's an article in Garden and Gun this month about that method. My brother in law used to use layers of newspaper, to no avail. I'll be trying the cardboard as an experiment in a flower bed.
This post was edited on 6/24/24 at 6:27 am
Posted by slinger1317
Northshore
Member since Sep 2005
6832 posts
Posted on 6/24/24 at 6:47 am to
What do you guys do for grass in beds?
I thankfully have the weeds under control, but over the years grass has crept in to the beds. We have an established bed with mulch and even a metal edge, but yet grass starts poking through. I hit it with Roundup every couple of weeks, or my wife pulls as much as she can, but seems like there's no way to stop it.
Posted by Sir Saint
1 post
Member since Jun 2010
5469 posts
Posted on 6/24/24 at 8:26 am to
what kind of grass?
Posted by bobbydigital
New Orleans
Member since Oct 2020
351 posts
Posted on 6/24/24 at 9:08 am to
Get you some Preen.
Posted by slinger1317
Northshore
Member since Sep 2005
6832 posts
Posted on 6/24/24 at 10:57 am to
Our yard is Zoysia, and the grass in the beds looks the same as the yard so I assume it is Zoysia as well
Posted by Tigerroc
Member since Jun 2017
285 posts
Posted on 6/24/24 at 1:51 pm to
I use.preemergents but still have a weeds I have to pull. I’ve tried newspaper and cardboard when making new beds but it takes time. I used to help an d friend with his flower beds and he used roofing shingles. Worked like a charm. We used small pieces of shingles to put under our back yard fence line. Works like a charm!! No more weed eating there.
Posted by deeprig9
Unincorporated Ozora
Member since Sep 2012
72991 posts
Posted on 6/24/24 at 2:17 pm to
quote:

Don't beat yourself up man. Weed barrier is a total waste of money and time IMO. In my experience, weed barriers do absolutely nothing. The weeds either grow through the barrier, or germinate on top of the barrier and grow anyway, just to frick with you.


This was my experience with a weed barrier in a tulip bed I busted my arse to build at my old house. The weeds didn't give a frick. They either found a way to get a root in between the seams or just grew hydroponically in the mulch, no soil needed.

Posted by Earthquake 88
Mobile
Member since Jan 2010
3292 posts
Posted on 6/24/24 at 7:59 pm to
I take that premixed Roundup that has a cup you can fasten on the end of the wand and spray any weeds in my flowerbed. Long as you spray while the wind is not blowing very hard it’s easy and you have precision control if you push that cup over the weeds and give it a quick mist because the cup blocks it from overspray. I’ve got flowerbeds all over my yard and I’ve never killed anything other than a few annuals that I accidentally sprayed. My boss has a forestry degree and he thinks I’m nuts for doing this, but I’ve been doing it that way for years and never have issues. You just have to make damn sure you don’t spray your plants. Now when Roundup was the original stuff no you couldn’t do it this way. But this stuff today isn’t anywhere near as strong but still the same a little of that stuff goes a long way. It takes 20 bales of pine straw to mulch my beds. No way I’m getting out there and pulling weeds.
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