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Lawn Weed Killing Options

April 19, 2013

The first line of defense against weeds taking over your lawn is to make your lawn denser and thicker by feeding regularly during the year.  Three to five feedings a year really helps your grass crowd out young weeds before they get a chance to get a toehold.  (Note:  Centipede Grass should only be fed two or three times a year.)  The second defense is to mow your grass at one of the higher settings on your mower.

Here are options for killing weeds in your lawn:

(Note:  if you have a Southern lawn, click here to link to my March 14 blog posting listing all your options.)

Option 1:  If you want to kill weeds while feeding your lawn here are your product options:

Scotts Turf Builder Weed & Feed – use on all lawns except St. Augustinegrass and Bentgrass.   Apply to a moist lawn and do not water for 24 hours after spreading.

Scotts Turf Builder with Halts Crabgrass Preventer – Use on all lawn.  There is still time to prevent crabgrass in many northern areas.  This product should be applied before you start to see wide spread dandelion puffballs.

Option 2:  If you want to kill weeds without feeding your lawn here are product options:

Ortho Nutsedge Killer (this spray kills other weeds beside Nutsedge including Wild Onion) – Can be used on any lawn

Ortho Weed-B-Gon MAX plus Crabgrass Killer – Can be used on any lawn except St. Augustinegrass, Bahia, and Centipedgrass.

Ortho Weed-B-Gon Chickweed, Clover  & Oxalis Killer – Can be used on any lawn except St. Augustinegrass, Bahia, Bermuda and Centipede.  This spray also does a great job of killing Ground Ivy (Creeping Charlie) and Wild Violets.

Roundup For Lawns – Can be used on Kentucky bluegrass, perennial ryegrass, fescue species (including tall, red and fine leaf varieties), bermudagrass, buffalograss and zoysiagrass. (Application to bermudagrass may cause temporary yellowing or discoloration but full recovery can be expected.)

If you have other lawn weed questions contact the Scotts Help Center.

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  1. Donald permalink

    I was happy to get my snap and go I got it ay lowes and I got the weed and feed and the insect kill for lawns when I used the snap and go it work great BUT THE weed and feed DID NOT the weeds DID NOT DIE I think they got bigger it did not WORK my name is Donald Kirchoff I am NOT happy I mite try it again and see what happens thanks

    • Hi Donald
      Sorry to hear that you did not get good weed control. Wondering if the weeds you have are the ones that this product kills. Another thing that can limit the control is if the product is put on dry foliage and you get rain or the lawn is watered after application. This product should go down when the lawn is moist and no rain is expected for 24 hours. Suggest you give our Help Center folks a call and tell them your situation. Their number: 800-543-TURF. They may suggest one of the Ortho Weed B Gon products to spray on your weeds since you have already given your lawn a feeding.

      • Donald permalink

        I have used the weed and feed before and never had this happen and I put it on a dry yard and it worked great but this did not. I like scotts products I have used them for years NEVER had a problem with them but this time I did. my grama &grapa. would not use any thing but scotts products in or around the house thanks for your time Donald Kirchoff

      • Hi Donald Give the Scotts Help Center a call: 800-543-TURF. Explain your situation and I think they will offer some solutions. Scotts products have a No-Quibble Guarantee.

      • Donald permalink

        ok I will give them a call thanks for your time

  2. Ron Whiteside permalink

    How soon after using Halts can I spread new grass seed?

    • Hi Ron
      You will need to wait till fall to seed as the crabgrass barrier remains on your soil for 4 months. If you have a few bare spots that you want to seed, you may be able to get grass seed to grow in those areas by breaking up the top 4 to 6 inches of soil and mixing in some Scotts Lawn Soil before putting down some Scotts EZ Seed. This helps to physically break up the crabgrass barrier on the soil as well as diluting it with the Organic Matter in the Lawn Soil.

  3. Doug permalink

    I planted my lawn last month,and now i have some weeds.When can i put weed killer on it.Thanks Doug

    • Hi Doug
      You can put weed control on your lawn either as Turf Builder Weed & Feed, or Ortho Weed B Gon MAX plus Crabgrass Killer once you have mowed your new grass 4 times.

  4. Freddie Wandel permalink

    I am going to treat my lawn in the next couple of days. I am going to use the Weed and feed but want to make sure it is safe for animals. The Lowe’s guy told me it will not hurt animals. I have 2 dogs that go in the backyard and eat the grass. Is this product safe or do you have a better suggestion?

    • Hi Freddie
      Here is what we do with our pets and friends of ours have done with their dogs. Keep the pets inside while you are spreading. The Weed and Feed should be put on moist foliage and you and your pets should stay off the lawn for 24 hours because you want the granules to stay on the moist weed leaves as long as possible. You also do not want to water or have rain during that 24 hours as this will wash the granules off the leaves. You can then water your lawn after this 24 hour period and once the lawn is dry, everyone can go on the lawn. Our neighbor treated her front lawn one weekend and let her dogs go out back. She then switched the next weekend and treated the back yard.

  5. Nick permalink

    I used turf builder with halts April 6, 2013. When can I use turf builder weed & feed on the same area? Northern Ohio along Lake Erie.

    • Hi Nick
      Typical time between feedings is 6 to 8 weeks. This can be squeezed down to 4 weeks, however you will have an overlap period with lots of nutrition to your grass and some extra mowing. One alternative is to spray your weeds with Ortho Weed B Gon MAX plus Crabgrass Killer and then feed at the normal time with Turf Builder.

      • Nick permalink

        I have been using Ortho Weed B Gon MAX plus Crabgrass Killer sporadically over the past two weeks or so to spot treat dandelions. The yellow flower makes it easy to find them. It is gratifying to see their little yellow heads drooping down in 24 – 48 hours. However, there is still quite a crop of dandelions that are hiding themselves by not putting up a yellow flag.

        Yesterday, I took advantage of an offer at Home Depot to buy Scotts Turf Builder Weed & Feed in a yellow bag along with regular Turf Builder. The sales associate recommended the “Scotts Turf Builder Weed & Feed” over the “Scotts Turf Builder Plus 2”. I have always used Plus 2 in the past. I don’t remember ever seeing the “yellow bag” before. Is it a new product, and how is it different from Plus 2?

      • Hi Nick The Scotts Turf Builder Weed & Feed is the same product as Scotts Turf Builder Plus 2, there was a name change this year.

  6. Rudy permalink

    Hi, I planted my grass (tall fescue) march 15th and is not growing evenly. How soon can I apply feed n’ weed or any other product to help it get stablished better before the hot summer days? I do water frequently. I also have a ton of weeds specially clover that are just now breaking out of the soil. Charlotte NC, thanks

    • Hi Rudy
      Since weed controls can injure new grass seedlings, it is recommended to hold off until your new grass has been mowed 4 times. Suggest you feed your lawn with Scotts Starter Lawn Food for New Grass. This will help speed establishment. Then when the time is right, you can spray your weeds with one of the Ortho Weed B Gon products. If you are only dealing with clover, the Ortho Weed B Gon Chickweed & Clover Killer works well. If you have a broad range of weeds, Ortho Weed B Gon MAX plus Crabgrass Killer would be your choice.

  7. Richard Boettger permalink

    Hi, I live just north of Jacksonville, FL. and have been told I have the florotam version of St. Augustine grass. After doing some research I have found that I can only use Atrizine to kill weeds without killing the grass. Used it but there are so many different types of weeds in my yard it only killed about half of them. Is there anything else that will get rid of the rest and bring my grass back to life (very dull and only patches of green thickness). PS since spring I fertilized only to see no results then aerated because someone told me the soil was compacted, then spread lime because i was told it probably needed it. Still nothing, then i did a soil test kit only to find no nitrogen and 8.5ph then had to kill weeds with atrizine due to hoa. and I just spread Scott’s Green Max hoping it helps. Any other recommendations to a better weed free lawn would be greatly appreciated.

    • Hi Richard
      You should see some greening/new growth from the GreenMAX feeding you just put down. Another weed control that you can use on your Floratam St. Augustine grass is Ortho NutSedge Killer. This product also kills a wide range of weeds. You should also protect your lawn from Chinchbugs. If you spread Ortho Fire Ant Killer granules over your entire lawn, you will also kill chinchbugs which are bad news for St. Augustine grass.

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