When to Plant After Using Roundup Weed Killer

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.

Further Information


  1. 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?

  2. 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.

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

    • Stay safe in your cave. Life without risks is a very boring life indeed. Roundup is safe. If it weren’t for insecticides, there wouldn’t be enough food in this world to feed everyone. But you know that, right?

  4. 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.

    • Au contraire, you DO get to choose which life you kill with pesticides. Glyphosate inhibits an enzyme that we and animals, birds, insects and fish completely lack. No target, no toxicity.

  5. 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

  6. 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,

  7. 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.

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

    • 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.

  9. 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?

  10. 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.


  11. 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?

  12. 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?

  13. 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.

  14. 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.

  15. 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!

  16. After reading all the evidence damning glyphosate , a key ingredient in ROUNDUP, I feel compelled to share the following :
    Monsanto has known for decades that Roundup, and all glyphosate products are poisonous to the soil, water, and all life on the planet. It does NOT breakdown as Monsanto would claim, but leaches into groundwater and stays in soil, releasing carcinogens that contaminate and cause cancer. This isn’t a case of “maybe” it can cause cancer. It actually does. Exposure to glyphosate is very dangerous to human health. A significant increase in brain, breast, liver, thyroid, bone, and lymph caners have been reported among those exposed to glyphosate residues.

    It’s time to ban this poison from any applications in industry and food production. Glyphosate is used in Monsanto’s “Smart seeds”, GMO seeds that grow food which has caused a significant increase in cases of the diseases Sprue, Celiac, Ruematoid Asthma, and Cancers across the board. Many countries have banned the use of glyphosates, The World Health Orgnization has listed glyphosate as a carcinogen. Read on:

    • The WHO???? And you’re gonna believe anything that Communist Chinese run outfit says? Sure some “doubt” what Monsanto says about Roundup. But professing doubt and proving Monsanto is wrong are two very different things.

  17. my strawberry plants almost all died after planting in a soil barely contaminated w Roundup 6 months earlier. I lost 98 out of 100 plants. So much for assuming 2-3 days is enough…
    Also remember glyphosate decomposes into another chemical which persists in the soil for a LONG, LONG time and has NOT been studied by EPA as they “just” focused on Glyphosate degradation time (half life).

  18. Im in australia – use glyphosate on my farm….i would never replant anything, especially food grade product, in any area sprayed for ten months after. Anything before that 10 month period will ingest the Glyphosate. Doesn’t matter what any information writes on a product, experience is a better judgement, for which i have plenty.

  19. I would avoid it, but also I would see what the manufacturer recommends. Can they be trusted, not all the way but they do know that lawyers are out there looking for cases. …. Now I am always amazed at the ones that come across like they are saving the planet…go organic! go hemp! Please, your on a computer, have a smart phone, and I am sure you take your leisure trips on jets just to have fun….you take regular showers, wash your clothes after one wearing and you areent washing them by hand or drying them out on a line. People want to say go organic, but how can you trust those organic farmers anymore than you can trust the government or some company. I am also tired of hearing people knock farmers….this country produces more food than any other nation. If we just went organic and stopped farming our methods….how would the world get fed?

  20. HELP…..I planted a fist size clump of the EVIL Snow-In-The Mountain 20 years ago. It is now taking over my ENTIRE flower garden. Should I just rent a back-hoe and be done with it ..? or can I use Roundup on this stuff and NOT kill the tulips and peonies, etc. To hire a landscaper to do this is VERY expensive…….*heavy sigh*…….

    Desperate lil ole lady in Montana.


  21. My landscaper’s worker accidentally covered 2/3 of my lawn with RoundUp last summer. Though the lawn has been re-seeded in those areas, grass refuses to grow. All I have is “golden hay.” My landscaper says I am not watering enough, but I have been watering almost every day. The grass around the dead areas is green and healthy. Is there an affordable and efficient to restore my lawn? Thanks for any advice.

  22. I sprayed roundup lightly over a bare dirt bed to plant shurbs….it was the extended plus weed preventer that last 4 months……I dug up a couple inches of the soil to try and get rid of what I could……is it safe to plant my shurbs

  23. Help my neighbor sprayed my prize flower garden with your product, if i add new soil to top of dead areas how soon before i can replant? And how do I save the remaining plants? is there anything that can be added to soil to save them?

  24. I am glad to know about roundup! I was thinking about using it for just one time. I have never used it before and don’t intend to use it now. I will use other measures even if it takes longer. Thanks everyone.

  25. Hi’
    You never give advise on vgetable garden use for roundup.

    I plant mainly sweet corn —Need know approx days before planting sweet corn I can use roundup.

    Thanks, George

  26. Surely the recent Court case awarding huge damages to the groundsman affected by cancer from use of Round-up should be enough to show us all to ditch this dangerous substance. Despite Monsanto and Bayer still deceiving, obfuscating and arguing. There’s more than sufficient evidence of how they manipulate evidence.

    • The guy sprayed Roundup for years and inhaled the mist and it drifted all over him. If you routinely drench yourself with bleach, alcohol, hydrogen peroxide or a plethora of other common household products, you too will feel the ill effects. An ounce of whiskey will kill rat. Should we ban whiskey?

    • Obviously you don’t know much of this case. This guy was using a pump spraying unit that blew up. He did not have proper protective gear on. He got drenched, and as far as I know he left it on for a period instead of immediately washing it off. This is an example of the tort system going crazy. There certainly are cases where the manufacturer hid information or the dangers of a product (ie. Teflon, DuPont). But some of the settlements in these cases are absolutely ridiculous, particularly in cases where the user did not follow manufacturers instructions. Juries award victims in these cases for being careless or just plain ignorant. Follow the instructions and safety precautions! That’s why the manufacturer put them there.

  27. Glyphosate is a chelator of cations – it ties them up.
    Furthermore it is a patented antibiotoc.
    Its chief modes of action! Your soil needs help.
    Try to replenish some micro nutrients. Expert advice needed. None better than Dr Don Huber. Google him.
    Also a soil probiotic (bacterial or fungal) would help enormously. Fulvic acid or fulvate powder at a few kgs or litres / ha will also purify your soil.

  28. The easiest way to kill off weeds/plants in a home garden without spraying is to cover the section with a black tarp and leave it there for a few weeks. When you pick up the tarp the plants should be dead underneath and the roots easy to remove.

  29. Lawns and gardens aside, if you are a homeowner and have bushes and climbing vines of poison ivy I would argue that roundup has a definate benefit. ESPECIALLY if you are unusually sensitive to the plant.


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