How to Kill Thistles in Grass


Few weeds detract from an attractive carpet of green grass quite like tall, prickly thistles. These common, aggressive weeds can quickly take over entire lawns and gardens. Various thistle cultivars reproduce from seeds and underground roots, making them difficult to eradicate. Controlling these weeds in the landscape requires vigilance and prompt action.

Things You'll Need

  • Garden hose
  • Shovel
  • Herbicide
  • Fertilizer
  • Examine your lawn to identify specific areas of thistle growth. Thistles, like other weeds usually take over bare areas of soil where grass grows poorly, such as the area near curbs or against the outside perimeter of your yard that may not receive sufficient amounts of water to keep the grass healthy.

  • Water any large areas of thistle that have taken over the soil in specific areas. Water deeply to soak the soil. Wait 24 hours to allow the water to absorb completely. Dig up the thistles in these areas that contain only minimal amounts of grass. Pull out the long taproots, using caution to avoid breaking the roots. Rake the soil smooth and scatter new grass seed over the top to replace the thistles and discourage the growth of new weeds. Keep the soil moist as the new grass seed sprouts and grows.

  • Apply a selective foliar herbicide to the entire lawn early in the spring when you notice the presence of thistle rosettes in your lawn, but prior to the appearance of flowering stalks. Select a type of herbicide safe for killing thistles in lawn grasses. These products include ingredients such as metsulfuron, triclopyr or dicamba, broadleaf herbicidal chemicals that won't harm lawn grasses. Mix and apply the herbicide according to the label instructions and apply it to the lawn on a dry, calm day. Repeat the application later in the season if you notice the formation of new thistle rosettes appearing in your lawn.

Tips & Warnings

  • Improve the health of your lawn grass to help it withstand weed and pest infestations. Apply a nitrogen fertilize to your lawn grass once or twice each season. Using a product that also contains a broadleaf herbicide will help knock down thistles and other weeds at the same time. Keep your lawn cut to a length between 2 and 3 inches long to discourage the flower formation and seed disbursement in existing thistles.

Related Searches


  • Photo Credit Jupiterimages/ Images
Promoted By Zergnet


You May Also Like

  • How to Kill Star Thistle

    There are several types of thistle that are commonly called star thistle. Many of these are not native to the U.S. such...

  • How to Kill the Grass & Not Flowers

    Oftentimes, grass will begin to infringe on flower beds. Lack of mulch or gardening borders can give grass a clear path to...

  • How to Kill Russian Thistle

    Russian thistles are commonly referred to as tumbleweeds and can be a pest to gardens and gardeners. The Russian thistle was first...

  • How to Control or Kill the Thistle Plant in Grass

    Several varieties of thistle invade home lawns. All of them are difficult to kill. Thistle plants have two means of entering and...

  • How to Kill Thistles

    Thistles are weedlike plants that become a pest in garden areas, competing with more desirable plants for necessary nutrients. Thistles will spread...

Related Searches

Check It Out

How to Make a Vertical Clay Pot Garden

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!