Cutworms On Marijuana Plants

June 19, 2021

Cutworms have the worst effect on younger marijuana seedlings. These pests can completely destroy them in just one night. They are a part of some moth species.

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Cutworms are around one to two inches with soft bodies that are brown or gray in color. Some may have stripes or spots and have a tendency to curl into a ‘C’ shape if you touch them.

Signs of Cutworms


Cutworms like to attack the weaker, more vulnerable marijuana plants. They prefer to sneak around during the night or in dark areas because they are light sensitive. Pull up a few inches of loose soil around the damaged plant and if you see little tiny balled-up rolls, then those are likely cutworms.

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These pests curl around the bottom of seedlings and chew through the stems, basically beheading it. You can identify the presence of cutworms when you see the tops of your seedlings laying on the ground. It will look like they were just cut off.

Not sure if cutworms are causing the damage to your marijuana plants? Check the article Marijuana pest and bug control for a list with pictures of all pests and bugs

How to get rid of cutworms

There are some things you can do at the time you are planting to ward off cutworms. Till your soil to reveal any cutworms. Make sure your garden has no grass and weeds when planting seedlings.


Planting sunflowers near the borders of your garden will serve as a source of attraction for pests like cutworms and keep them away from your marijuana. If you ever see cutworms on the perimeter where your sunflowers are, immediately eradicate them. One way to get rid of cutworms is by drowning in a bucket filled with water and soap or gasoline.

Parasitic wasps and frogs will eat these things up. Mulching your planting site will welcome frogs during the night and they will eat cutworms, as well as all other pests who come out at night.

One easy way to get rid of them is by going out at night with a flashlight and simply removing them yourself. You can also sprinkle cornmeal in your garden too. Ants, fleas, cutworms and the like will feast on this but will fail to digest it, which causes them to swell up and die.

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List of marijuana plant sypmtoms

  • Tops of the seedlings look like they are cut off
  • Cutworms appearing as little round gray or brown balls in the soil
  • Older plants are titling over and wilting

While cutworms can potentially be damaging to your plant, they are also very easy to remove. Don’t let the suckers kill your precious plants. Get them before they become a problem, or else you can kiss your plants goodbye.

Remember that plants with strong genetics have less change of getting sick and are less vulnerable for pests and diseases. So make sure to buy marijuana seeds from a trusted seed bank.

Faq About Cutworms On Marijuana Plants

Do Cutworms affect younger marijuana seedlings very badly?

Yes, Cutworms are very dangerous for marijuana seedlings. They can completely destroy them in just one night.

What is the main sign of cutworms on marijuana plants?

Cutworms are light sensitive, so pull up a few inches of loose soil around the damaged marijuana plant and if you see little tiny balled-up rolls, then those are likely cutworms.

What’s the best way to control Cutworms on marijuana?

The best way to keep Cutworms away from your marijuana plants is to use Bug Blaster. It is a commercial product that will always to the job

Thanks for reading. Please leave comments or questions below and don’t forget to download my free grow bible


The founder of I Love Growing Marijuana, Robert Bergman, is a marijuana growing expert that enjoys sharing his knowledge with the world. He combines years of experience, ranging from small-scale grows to massive operations, with a passion for growing. His articles include tutorials on growing... [read more]


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  1. By jack ,05 Nov 2014
    i will try the corn meal i will put it all over and on the buds
  2. By John Cox ,12 Jul 2015
    I would like to think robert and all of you who work for him .I order some seeds from ilgm back at the last part of Feb 2015 and still had not got any seeds .Robert sent me my money […]Read More
  3. By Symptom Checker – Identify Marijuana Plant Problems ,24 Jul 2015
    […] Cutworms […]
  4. By Bike man ,25 Aug 2015
    I had worms every year when the plants were in bloom. They would eat my buds and I swear I thought about eating them suckers but no! I don't no much about the types of worms but my thinking is […]Read More
    1. By Bill Finberg ,19 Sep 2015
      Just plain water ? Those little bastards love to dig into your Bud's !!!! Have done a lot of manual inspection .Wish there's a easier way .
    2. By latewood ,23 Sep 2015
      You have to hand pick worms. Whoever told you that spraying water on them, was off... I use this: If that does not help you out. Join our support forum for many more opinions, expert advice.
  5. By marty ,28 Sep 2015
    i had worms from from the gypsy moth again this year and i have been spraying neem oil since the spring,,and bt powder when my plants first started flowering,,,,,but i have the same problem this year,,,but the plants i put […]Read More
  6. By Johnny ,24 Dec 2015
    The worst year since 1970. Crop was a failure in 2014. Worms ate the buds from the inside, hard to see till clipping. Trashed huge buds from the waste inside, poop and dead worms. Medicine down the drain. Moths were […]Read More
    1. By Jennifer ILGM ,29 Dec 2015
      Hi Johnny hopefully everything goes well this year. Keep us posted.
  7. By Johnny ,24 Dec 2015
    Eating the worms never came to mind, but since they ate the trichromes I thought about smoking a bunch of them alive. haha. Might still do it if they come back. Birds were helping on the stems but not inside […]Read More
  8. By Marijuana Pests & Bugs – Control And Identification ,21 Jan 2016
    […] Thankfully, it’s not too difficult to get rid of cutworms. Like some of the other pests listed here, they have a number of natural predators, so sometimes they’ll just go away without any extra intervention. Often, you can get […]Read More
  9. By Andre ,19 Feb 2016
    Hi there, I ordered and received 10 seeds from ILGM, followed the instructions on the webside, 5 seeds came up and 5 didn't do anything, left them in the little grow "sponges" anyway to see if they were just late […]Read More
  10. By latewood.ILGM ,22 Feb 2016
    Andre, It is hard to guess what type pf worm; If it is a worm , that has infested your plant. I advise you to join our Forum and post some pictures of you issue. We offer a Support ticket; […]Read More
  11. By GS ,18 Jul 2016
    Finding the worms inside the stems or stalk and hollowing out the stem causing the tops to wilt. Cut one open and found dead worm inside it leaves brown deposits on the shoots. Any thoughts?
  12. By Scott ,02 May 2017
    Got to try that cornmeal thing buds and realeztate incly uded meanwhile plucking the basturds and watching them swim in acid gives me a rush Its all about who will have the highest worm count heck make it a family […]Read More
    1. By Johnny ,11 Oct 2017
      Not good news here. After a really hot summer of 45 days above 100, plants were hit by worms in the buds again. I planted an early crop of autos that made a great smaller crop that will get me […]Read More
  13. By Carolyn ,09 Sep 2018
    My plants are a few weeks before harvest yesterday the top of a real nice bud just got our attention we grabbed it to look and it just feel off it was a little brown well brownish orange hairs on […]Read More
    1. By latewood_ILGM ,10 Oct 2018
      Carolyn, Any time you find worms in your buds, it is prudent to inspect all plants daily and remove all worms found. Late in the grow it is not advisable to spray anything, so I feel for you. Perhaps look […]Read More
  14. By Merri Johnson ,06 Oct 2018
    I would like know do the caterpillar and hemp bores where do they go in cold rainy weather we cant find them bc it cold and rainy
    1. By latewood_ILGM ,10 Oct 2018
      Marri, One might assume they are bedded down in the soil or cozied up inside of a big bud. Cold and rainy weather is not a good environment for Cannabis, though. Always use a search engine when confronted with an […]Read More
  15. By apk dingdong root ,01 Jun 2020
    Your style is really unique compared to other people I've read stuff from. Thank you for posting when you have the opportunity, Guess I will just bookmark this site.
  16. By Murray ,13 Jul 2020
    Aw, this was an exceptionally good post. Taking a few minutes and actual effort to produce a really good article… but what can I say… I procrastinate a lot and don't manage to get anything done.
  17. By Wade ,06 Sep 2020
    Will my plants recover after being attacked this late in the year being outside??
  18. By Angela ,25 Oct 2020
    Thanks alot Never knew about the cornmeal thing. I never put any pesticides on something I'm consuming. I've gots ants all over my property. It's a problem. I also have dogs so the cornmeal thing is great cuz it won't […]Read More

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