How do I remove all the spider grass?

by Susan

I have a side yard flower bed and it has this not so appealing spider grass plant throughout. What is best way to rid of it without tearing up entire bed?

  5 answers
  • Linda Sikut Linda Sikut on Feb 23, 2019

    Hi Susan,

    If you don't want to use chemicals, the best way to remove it is to dig it up and make sure that you get all of the roots. You could also try pouring boiling water on each clump. That should kill it but leave the dirt below usable for your flowers. If you decide to use a chemical, Round-up has the chemical needed to kill it, but it also kills the dirt so you'll probably need to amend your soil.

    • Susan Susan on Feb 24, 2019

      I thought that would be the best answer. Just needed support as answer. I have hostas which I love and that Spider grass just is a beast. Thank you

  • Karen Karen on Feb 23, 2019

    Linda (above) has great ideas! However, I would not use Round-up. The chemicals are very harmful to humans and especially animals. Formula for a natural "systemic" week killer: 1 gal. of white cleaning vinegar (6% acidic) found underneath the regular (5% acidic) white vinegar. One cup of salt. One tsp. Dawn detergent. Heat vinegar to boiling point. Take off stove and stir in salt. Allow to cool completely. Then add Dawn. Pour in a hand-held sprayer or whatever you have. Make sure the nozzle is turned to "stream" and not mist. Hold the sprayer right up against the weed and spray. I had the same problem. Got down on my knees and sprayed a small part of the yard each day... just take your time and not wear yourself out. REMEMBER: This is a systemic solution and it takes about two weeks for it to reach roots deep in soil. Kills poison ivy and anything it touches. Just in case, take a piece of cardboard outside with you to possibly block off anything you do not want sprayed. After 2 weeks, spray again on anything you missed. Oh, one more thing, never use the 6% white vinegar inside your home...way too acidic!

    • See 4 previous
    • Karen Karen on Feb 24, 2019

      Linda, I realize that salt kills and I understand your concern. However, since the salt has been dissolved in the gallon of hot vinegar it will ONLY kill what you spray. Further, the dawn detergent makes the solution stick to the weeds and not roll off. It's not like someone throwing out salt to melt snow where it continues to lay there and kill grass and get in to the soil. This is not the case with using my formula. You really need the salt. And again, hold the sprayer up against the weed itself and take your time. It's just like with any other weed killer but this one is not toxic to people or animals. I've used it for years and had no problem....but that's just me. So, whatever you do, I wish you a good season with lots of flowers and veggies!

  • Scott Scott on Oct 19, 2021

    Roundup. Spider grass has an extensive root system. It will reappear if dug up and physically removed because you won't get all the roots. It's not true that Roundup will kill the soil because it chemically degrades into inert compounds that keep degrading. Also not true is that it's harmful to humans; it isn't. There was a B.S. lawsuit that made as much sense as McDonald's hot coffee lawsuit. It is harmful to about all plants including most trees that receive overspray but takes many applications to kill spreading trees like pepper trees. It's the best way to remove a lot of spider grass. It absorbs slowly through the plant's circulatory system down into the roots where it slowly kills the plant enzymatically. It may take a week or 2 and might need 2 applications. When it's all dead, then dig it up, wait 3 days, amend your soil, and re-plant what you want.

  • Redcatcec Redcatcec on Oct 02, 2023

    I have never had much luck with the salt, vinegar, dishsoap recipes, even with using the extra strength vinegar. Boiling water works the best, also pulling them after a rainstorm when the ground is softer.

  • Johnavallance82 Johnavallance82 on Oct 02, 2023

    Spot weed it using a weed lifter.