Home Improvement Expert Danny Lipford

When to Plant After Using Roundup Weed Killer

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Roundup (glyphosate) Weed Killer

How long do I have to wait to plant after spraying weeds with Roundup? -Ron

According to Scotts, the manufacturer of Roundup (glyphosate) weed killer, its safe to plant ornamental flowers, shrubs, and trees the next day; and they say you can plant grasses and edible plants and trees after three days.

As weed killers go, glyphosate is considered relatively safe, because of how quickly it breaks down. However, when using a glyphosate weed killer such as Roundup, I’d always give it a few days to do its job and be gone before you start digging. Here’s why:

  • Needs Time To Work: Contact weed killers, such as glyphosate, are absorbed through the leaves and slowly make their way down to the plant roots. If you plow, dig, or disturb the weeds before they’re good and dead, you risk breaking off some live roots that will sprout again.
  • Residues in Edible Plants: If applied properly and carefully, the small amount of residue on your soil surface shouldn’t harm new plants. However, you wouldn’t want those residues to be absorbed by plants you plan to eat, so I’d hold off on planting herbs and vegetables for several days.
  • Might Harm Seed: New, tender sprouts from seed might also be vulnerable to soil residues, so give them a chance to break down before sowing grass or other seeds.

Good luck!

Julie

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19 Comments on “When to Plant After Using Roundup Weed Killer”

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  1. Jeremy Says:
    May 12th, 2012 at 3:33 pm

    It is a common myth that RoundUp breaks down quickly. According to filings with the EPA, the half life of glycophosate is 47 days. See: http://efw.bpa.gov/environmental_services/Document_Library/Vegetation_Management/sheets/Glyphosate.pdf

  2. Kris Says:
    June 4th, 2013 at 5:48 am

    It isn’t really a “myth” about weed killer working fast, its exactly what they print right on the front of the jugs in big letters. So it’s actually more accurate to say its misleading advertising than a “myth”. They say right on the bottle “noticeable results in hours” and its obviously not the case.

    We shouldn’t let companies get a pass on things like that, its happening way more often with on products of all kinds, the BS they advertise getting deeper, why not just call it like it is?

  3. Jeremy Says:
    June 4th, 2013 at 10:01 am

    Kris,

    If you look at my earlier comment you’ll see I wasn’t speaking to the speed with which RoundUp kills the plant – I was speaking to how rapidly the toxic compounds break down, which directly impacts both how soon one can plant in that area (directly to the question above) and human health.

  4. Melodae Says:
    June 8th, 2013 at 2:08 pm

    I was going to subscribe to Today’s Homeowner, until I saw this post about RoundUp. It shouldn’t be used at all. Period.

  5. Lisa Says:
    June 26th, 2013 at 8:19 am

    Agreed. I see that stuff on the shelves and it makes me sick. Little poison flags all over the lawns around the neighborhood, and those are usually just the ones who have an outside service come in to spray… not the folks who buy the jugs of poison from the store. Poison is poison – kills and damage life. You don’t get to choose which life. Run off hurts us all. Stop poisoning the planet and use an organic MULCH to build the soil life and keep the weeds down.

  6. Stephen lane Says:
    July 3rd, 2013 at 7:39 pm

    You people have obviously never dealt with invasive plants like bears breech, organic nothing bla bla will kill this mother of a plant , if it wasn’t for chemicals we’d all be over run by bed bugs and rats and roaches , u hippies needs a grip

  7. Maura Says:
    August 6th, 2013 at 7:26 pm

    Hi,
    We killed the lawn(using Ultra Stop Weed and Grass Killer)and we do not know when to replant the new grass(it takes more than two weeks?)

    Thank you,
    Maura

  8. Brian Says:
    July 3rd, 2014 at 3:48 pm

    Thanks for the info about how long to wait to replant.

    As for the other posters throwing in opinions, I’m going home to spray glycophosphate on a half acre of weeds and will excavate 2499 SF at a time just because of the the posts you made. When used appropriately, chemicals can help produce great, safe products. Now go enjoy your $20 ‘organic’ vegetable wrap.

  9. Andi Says:
    July 30th, 2014 at 5:15 pm

    So, then, to get a straight answer, if you please, how long do I have to wait to plant after spraying weeds with Roundup???

  10. Official Comment:

    Ben Erickson Says:
    July 31st, 2014 at 8:14 am

    Andi,
    As indicated in the article above, the length of time you need to wait before replanting after spraying Roundup can vary from 1 to 3 days depending on the type of plant you’re planting.

  11. George Wages Says:
    July 31st, 2014 at 11:22 am

    Why is it I can go buy Roundup but can’t buy Graze on without a class and a license

  12. Judy Says:
    November 17th, 2014 at 7:35 am

    Used on edible food, if it is used to kill weeds in a field with food, it gets on the food, how much of the roundup still on the food for injestion?

  13. Tom Storm Says:
    January 17th, 2015 at 2:18 pm

    We have a voracious foreign invader on our little island here in the South Pacific. Impossible to remove by digging pulling etc. Need to kill at root level and as much as I would prefer not to use herbicides – I don’t have a much choice. Roundup actually does work in a matter of hours but I will wait a week before planting seeds.

    Tom

  14. Bonnie Hutto Says:
    March 31st, 2015 at 9:56 am

    We have a wild ground cover here that has invaded my whole yard. It has white peanut type growth on the roots and where ever there is a nut a whole new plant grows again. It has been sprayed many times with Round-up which kills the plant but not these little white things underground. I use barrels cut in half to plant my vegetables and somehow this plant has even invaded these barrels. Any suggestions?

  15. Richard Says:
    May 2nd, 2015 at 12:47 pm

    I have sprayed the undesireable seeds in our herb and flower garden thrice. I want to sow seeds for zinnia and marigolds now. Shall I wait 3 days, or more?

  16. grete sandberg Says:
    May 30th, 2015 at 12:06 pm

    I have a large area that used to be a lawn. For reasons we were not around and the grass died, weed are abundant. Sod is expensive to buy and labor extensive to put down. Seeding then….

    Some say three weeks, some four — between Round up an seeding. Some say days? Is there rime or reason somewhere.
    Surmise that vinegar will not do in this case.

  17. Jeannine M Says:
    June 14th, 2015 at 2:23 pm

    ECOSmart products sold at Home Depot, Ace Hardware and other stores, along with safer and more natural alternatives like the lemon juice, vinegar and soap mixtures you can learn about on the internet and are much cheaper, can be used to kill weeds and are ecologically and biologically safe to humans and pets. It is not necessary to use all these harmful poisons to be effective.

  18. Jeannine M Says:
    June 14th, 2015 at 2:25 pm

    One more point, be very careful about what companies and government agencies (bought and paid for by those companies)…you allow to think for you, as they were the same families of companies that said for one of many examples…that agent orange was safe!

  19. William Says:
    June 19th, 2015 at 2:33 am

    What can I use to eradicate Knott weed, and still have use for the soil at a later date?

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