Weed-B-Gon vs Roundup Weed and Grass Killer

You better pay careful attention when purchasing and using herbicides on your lawn to control or kill weeds. Two products that are very popular and widely used are Ortho’s Weed-B-Gon and Monsanto’s Roundup Weed and Grass Killer. These products are readily available at virtually any store that has a lawn or garden care center. However, it is necessary to identify your particular need prior to using either of these two products as they control weeds in very different manners.

Ortho’s Weed-B-Gon is used on established lawns to kill weeds. It is a liquid that can be purchased so that one can mix their own amounts or it can be purchased in ready to use sizes to control weeds. The most common ready to use weed killer size is a gallon. It comes packaged with a pump and can be dispensed for spot treatments of weeds. The product can also be mixed for spray applicators to mix larger quantities. Ortho is a division of Scotts that produces a myriad of lawn and grass products. This product when sprayed over the entire lawn or just as a spot application kills a variety of broad leafed weeds. If used properly it will not harm the lawn, but one must be careful not to inadvertently spray this weed killer on desirable plants. The key word is that Weed-B-Gon will kill weeds, but will not generally harm an established lawn if used properly. One should read the directions to insure it will not harm certain types of grasses. Bermuda grass may be harmed by this product.

Roundup Weed and Grass Killer is much different than the Weed-B-Gon. Roundup is not selective and will eradicate all grasses and kill weeds that it comes in contact with. This means that it is not the ideal product to use on an established lawn. This is however, a great product when one might want to insure that no grasses grow around mulched areas under trees or along walkways. It is particularly effective to kill weeds and grasses when absolutely no growth is desired. This product is ideal for a fall application if one wants to kill all grass and weeds in a lawn and begin anew. Since fall is the ideal time to plant grass, many chose to kill all the grass types and reseed. There is a time period between the application of this product and the reseeding phase so read the product description carefully to insure that sufficient time exists to enable a new weed free lawn to be established.

Comments

  1. Roger Uehara says:

    I planted tall fescue a couple of months ago. It has come up but there is also a thick leaved grass that has come up with it. How do I kill the thick leaved grass and keep the tall fescue?

    Thanks

  2. re: Roger:

    If it is a grass, you’ll have to pull it. There aren’t any products that reliably select between grasses.

  3. I am renovating my large back yard. Removed all existing trees, grass/weeds but mainly weeds. This was over two months ago and its mostly dirt now. but, new weeds and some grass are starting to sprout up again everywhere. We plan to redo the grass area with new fescue sod, but are concerned about the weeds again. I’ve been told to use Roundup Weed & Grass Killer on the entire area of the backyard, wait 2/3 weeks, turn over the dirt and remove all the dead grass/weeds. then to wait another week and start leveling out the dirt, add grass top soil and lay down the new sod. Is this accurate?

  4. I have spring flox blooming here in upstate NY. It is inundated with weeds and (I think) tall grass. Can I spray the flox with Weed B Gon and kill the weeds but not the blooming flox?

  5. kassem bahaji says:

    I used round-up weed and grass killer on my lawn, thinking it was just a weed killer. Result? Am ugly yard with multiple dead grass spots all over. Is there anything I can do to fix the problem? Thank you.
    kassem

  6. Jean Ann Jamison says:

    I sprayed round up weed killer on dandelions in my yard. I now have large circles of dead grass. Is there a product I can spray on the dead grass to make it look green while it is growing back?

  7. I have a question that can easily be answered with common sense and by actually reading the article? can you help me?

  8. corey_philly says:

    Would yelling at my lawn hurt its feelings? Thank you.
    Corey

  9. I have a question. If a train leaves the station going 60 mph and passes a train doing 40, how much do I weigh?

  10. Barbara Chnielewski says:

    My lawn-man combined weed-be-gone and round-up. and sprayed the combination to kill all kind of weeds and grass on the gravel,. Will the chemicals when combined, neutralize each other or just do the job. Or is it going to explode when left over in the plastic round-up bottle. What should I expect if left over like that. When I heard what he did, I got scared that I am getting into some explosive situation. Thank you

  11. Barbara Chmielewski says:

    My lawn-man combined weed-be-gone and round-up. and sprayed the combination to kill all kind of weeds and grass on the gravel,. Will the chemicals when combined, neutralize each other or just do the job. Or is it going to explode when left over in the plastic round-up bottle. What should I expect if left over like that. When I heard what he did, I got scared that I am getting into some explosive situation. Thank you, Barbara Chmielewski

  12. Mabrilli says:

    If I used Ortho Weed B Gone on some weeds between my strawberries and rasberries, will it leak into them and kill them? or make them toxic to eat?

  13. your instructions for your products SUCK.

  14. what ingredients are in the weed b gon and the round-up?

  15. what chemicals are in the weed b gon and the round-up?

  16. I can’t figure out how to open this blankety-blank bottle! Is there a secret?

    • Linda Coffman says:

      I used Ortho Weed-B-Gone in my landscaping. My Barberry Bushes are now dying. Could the Weed-B- Gone by the problem? They were doing well up to this time.

  17. Lloyd Dobler says:

    While you’re reading this I’m outside killing your lawn one blade at a time. WooohahahaHAHAHAHAHA!!

  18. My husband mistakenly used Round up on weeds in our grass, and needless to say, the greass is DEAD. He was very artistic in doing so, so you can imagine what the yard looks like! Straw looking squiggly lines ALL OVER! Help! How do we repair!?

  19. Mike's wife says:

    what’s the color difference b/t the two?
    we accidently got the mixes mixed up and one is dark brown and the other yellow…do you know which is which?

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  24. I applied weedbgone to the weeds growing along the walkway, driveway, shrub bed, etc..
    It performed very poorly. The weeds got a little wilted, never died and came back in full force.
    Roundup kills the weeds within 2 days. Maybe weedbgone is better for lawn type weeds, but
    for the use I mentioned. It stinks!

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