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Home » Blog » How to Kill Weeds with Steam

How to Kill Weeds with Steam

Kill weeds with steam by using my easy DIY hack! Instantly kill weeds by harnessing the power of an inexpensive steam mop without chemicals or harming other plants and get back to enjoying your garden. You can use steam to kill weeds in vegetable gardens, landscaping, or pavement.

The demand for natural weed killers has never been greater as chemical weed killers are linked to cancer, but products claiming to kill weeds naturally are unreliable at best. Natural weed killers like vinegar or salt are indiscriminate in their ability to kill everything. Salt accumulation in soil is dangerous and costly in the long term. NEVER USE SALT in your garden.

That is where killing weeds naturally with steam comes to save the day. Not only does steam kill weeds naturally with water, but it turns weeds into compost to improve soil health. Instead of filling trash cans then our landfills with weeds, use steam to rapidly breaks down plant material right in your landscape without the need for a compost bin. Seriously y’all, this is a no brainer. Steam is amazing! 

See how CU Boulder is using commercial steamers on campus to control weeds naturally. 

DIY Weed Steamer

With only one mediocre steam weeder on the market, naturally killing weeds with steam has not been a viable option for homeowners like myself.

Until now.

how to kill weeds with steam

Follow along as I turn my inexpensive steam mop into a lean, mean, weed killing machine. 

 

Supplies for Steam Weeder

  • Shark Steam Mop
    • Professional one I use myself
    • Cheaper one that should work as well
  • Plastic To-Go Soup Container
  • Drill
  • Drill bits
  • Screwdrivers
  • Needle nose pliers

Disassemble Steam Mop Head

First things first. We need to disassemble a mop head to use as parts. My Shark Professional Steam Mop came with two heads. Rectangular and triangular. I never use the triangular one so it’s the one I’m using here. If only one head comes with your steam mop, you can buy additional ones here to use exclusively for steam weed killing.

 

Set the head aside as you will be working with this small piece from now on.

 

Remove all four small screws from inside but keep two nearby. You’ll be reusing them.

Next, we need to remove the steam hose from the housing by squeezing this metal clamp.

Use needle nose pliers to squeeze the clamp together while pulling the hose off the plastic nipple.
It helps to have two people but I did it myself with a little persistence.

Now you’re ready to start building your steam weed killer.

Assemble Steam Weed Killer

Carefully drill a hole barely larger than the size of the plastic nipple on the bottom of your plastic to-go soup container.
DO NOT PRESS HARD. These containers are brittle when cool and will crack if you rush it. You’ll see where I got impatient later on.

Install the plastic nipple and pre-drill 2 small holes for the screws. This is where I got impatient and cracked my container.
Reuse the small stainless screws you set aside earlier to attach the nipple to the container. Screws do not need to be tight. Just enough to keep everything together.

 

Next, put the hose back on the nipple by squeezing the metal clamp as you push. This is where it really helps to have two sets of hands.

Make sure the metal clamp is actually around the hose AND nipple. Steam is coming out at very high pressure and the hose will blow off if it’s not secure.

Last things last, drill two large holes near the collar of the container. This relieves pressure as the steam is released. Without it, you risk the container exploding or worse. Trust me. I learned that lesson quickly.

Attach Steam Mop

All that’s left is to attach your new steam weeding head.

 

Isn’t she a thing of beauty?

kill weeds with steam

Fill her up with tap water, plug her in, set on Mop, and within 30 seconds you’ll be killing weeds naturally with steam!

When set on “Scrub” you can go pretty fast but it does go through water much faster. “Mop” is a more leisurely pace and should last you a good 15 minutes or more.

 

Now for the warnings

  • You are working with very hot steam. Be careful.
  • If you have tall weeds, be careful not to block the steam outlet. You’ll create back pressure and that’s very bad. I think I am actually going to cut the hose shorter myself bc let’s be honest, I let my weeds get a little too tall.
  • This is an indoor electrical appliance. You need to be very careful about the cord and water. No one likes being electrocuted.
  • Do not steam plants you actually like.
  • Steam helps to germinate weed seeds. While it initially leads to more weeds sprouting, it also helps exhaust the weeds’ seed banks and eventually leads to much lower-maintenance beds. Just keep steaming.

Steam Weed Killing Supplies

  • Shark Steamer
  • Plastic Hot Food Container
  • Extra Mop Head

UPDATE

I tried using a tiny metal bucket instead of the plastic container as my weed steamer head and it failed miserably. The heat disperses too quickly, annoying the weeds instead of straight up killing them.

I would love to hear all about your natural weed killing adventures!

Comment below to share how steam has helped in your garden!

I have personally purchased & used all linked products. As an Amazon Associate I earn from qualifying purchases. Why I use affiliate links instead of annoying ads

Published: December 7, 2018 Garden, Small Projects, Tutorials & Tips Updated: October 31, 2020

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Reader Interactions

Comments

  1. Chad says

    May 18, 2019 at 10:31 am

    Just built it this morning! Already killed some weeds. Thank you so much for posting this. Great to not have to pull weeds or use pesticides around the kids.

    Reply
    • Genevieve says

      May 23, 2019 at 12:23 pm

      Ya! You totally made my day! So happy to see it’s working for you! I’m just about to go use my steam weed killer on chamberbitter weed that just starting popping up so I’ll keep everyone updated on how it goes. I’m predicting a 100% kill rate without damage to my hydrangeas.

      Reply
      • Tauri says

        March 23, 2020 at 4:04 am

        still working good for you? Can i use this in gardens near plants i like or only on walkways?

        Reply
        • Genevieve says

          March 23, 2020 at 7:51 am

          Yes, you can use it around good plants but stay a few feet away to save the roots. I was able to steam around my hydrangeas & boxwoods without a problem.

          Reply
  2. Molly says

    January 27, 2020 at 10:04 pm

    This is great! Thank you. I’ve been trying to figure out how to afford a schmancy steamer, but I bet this will do the job. Tip: heat your drill bit end slightly before you drill into the plastic soup bucket- it’ll soften and not crack. (Don’t heat the bucket, heat the drill bit.)

    Reply
    • Genevieve says

      January 28, 2020 at 7:56 pm

      Great tip!

      I tried using a very small metal bucket for better durability but it dispersed heat too fast. It wasn’t nearly as effective at killing weeds with steam as the plastic soup container.

      Reply
  3. Jim in Draperville says

    June 17, 2020 at 12:29 pm

    try using a large microwave cook COVER?, heat resistant, larger footprint for areas lIKE driveways, tape over vent holes if needed.

    Reply
    • Genevieve says

      June 17, 2020 at 4:54 pm

      Excellent idea! I completely forgot about those.

      Reply
  4. John says

    August 10, 2020 at 5:43 pm

    Any reason you didn’t just use the triangular plastic head? Im looking at a simple solution for my wife till I can get home and do the fabrication.

    Reply
    • Genevieve says

      August 10, 2020 at 7:58 pm

      Since the triangle head spreads the steam horizontally instead of directing it down vertically, you give the weeds a nice facial. I needed a concentrated steam so it would blast the weeds & contain the steam for maximum efficiency.

      Reply
  5. Lili Krins says

    January 31, 2021 at 10:15 pm

    Thanks for sharing your brilliant idea. Was looking online for professional steam weeders, but this is by far a much cheaper solution. Do you think using a carpet steamer as the unit would work the same? As thats what I have.

    Reply
    • Genevieve says

      January 31, 2021 at 10:43 pm

      Does the carpet steamer actually produce steam? I’ve only seen “carpet steamers” that dispense hot water instead of steam.

      Reply
  6. Evelyn says

    April 7, 2021 at 7:35 pm

    Hi! How long do you steam each weed for? My lovely husband thinks we need to set the plastic container on each weed for about 10 seconds. As my yard is overrun with chickweed and creeping Charlie, if I do 10 seconds for every weed, I’ll be 80 by the time I finish one pass. So I’m hoping you can kind of move slowly along and get the right effect. Thanks so much for posting this.

    Reply
    • Genevieve says

      April 8, 2021 at 1:55 am

      I go about 5 seconds or until they turn bright green.

      Reply
  7. Evelyn Galbraith says

    April 23, 2021 at 6:41 pm

    Will it kill Canadian thistle?

    Reply
    • Genevieve says

      April 23, 2021 at 7:42 pm

      Steam will kill everything. Depending on the root structure, it may take multiple attempts.

      Reply
  8. Bunny says

    October 23, 2021 at 3:30 pm

    Will this kill nutsedge in an iris garden?

    Reply
    • Genevieve says

      October 23, 2021 at 4:25 pm

      Evil, evil sedge. It will definitely kill it but you will need to steam it every time a new shoot comes up. Try steaming then apply 3 layers of cardboard + mulch. It eliminated nutsedge in my infested beds for 6 months and I can easily steam the new plants popping up here & there.

      Reply
  9. Susan says

    April 3, 2022 at 4:53 am

    I have to use the triangle because I don’t have the ingenuity to take apart my steamer. Is that okay?

    Reply
    • Genevieve says

      April 3, 2022 at 6:20 am

      It’s allowed.

      Reply
  10. Emily says

    May 4, 2022 at 10:31 am

    New homeowner here with an awesome 30×5 raised bed made by the previous owners. Was super excited about all the veggies I planted…. Until I noticed a ton of butterfly-wing-looking plants carpeting the entire bed— morning glories!!!!! It’s honestly shocking how many there are. There’s a good section of the bed we haven’t utilized yet so I figure we’d be fine to try this on that part, and I may even sacrifice some of our new seedlings to try to get rid of the blanket of morning glory’s!!!

    Reply
    • Genevieve says

      May 4, 2022 at 3:01 pm

      For huge open spaces like that, look into solarizing the soil if you can wait a while before planting.

      I’ve also found putting 2-3 layers of cardboard under mulch 100% blocks weeds/other unwanted plants. It’s the only method that works on bermuda grass and sedges.

      Reply
  11. Jeanne says

    May 17, 2022 at 6:40 pm

    Does this entirely kill the weed, or just the above-ground part?

    Reply
    • Genevieve says

      May 17, 2022 at 6:45 pm

      It kills the top which starves the root. It is not very good at killing plants with taproots. You need a spiked steamer to kill those. One day I’ll come up with a hack for that.

      Reply
  12. Justin says

    July 11, 2022 at 3:38 pm

    Another good tool if you don’t want to do the fabrication work is the Wagner wallpaper steamer. You can use the big attachment for bigger areas, or just use the hose or small attachment for more targeting.

    The solution in this post is way nicer for being able to stand while doing it.

    Reply
    • Genevieve says

      July 11, 2022 at 5:11 pm

      Agree. I tried using my Jiffy Steamer and bending over was just not fun. I even attached a pole and it was not worth it.

      Reply
  13. Jean Moody says

    August 6, 2022 at 8:59 pm

    I can’t seem to get the hose back in the nipple. The clamp is off of the hose now. Any recommendations?

    Jean

    Reply
    • Genevieve says

      August 16, 2022 at 7:17 am

      That is the trickiest part of this whole process. I use a good long pair of needle nose pliers to loosen the clamp tension with one hand then slide it up once the hose is on the nipple. It’s about impossible without needle nose pliers.

      Reply

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