How to Control Nutgrass and Johnsongrass

Combat persistent weeds with a creativity and simple maintenance.
Similar Topics:

Q: What can be used to keep nutgrass and Johnsongrass out of the garden? I have tilled and used a weed block, have mulch on top and the grasses still poke through. Is there any spray that would not be harmful to the vegetable plants? -M.H., Hewitt, TX

A: Sprays that would kill such weeds are either not labeled for garden use or would be harmful to vegetable plants they contact. There are, however, several options for controlling such persistent weeds, none of which is fast or easy.

First, remember that weeds, no matter how tough, are plants. When a plant is chopped off, it uses stored energy to regrow, and then restores its reserves when the leafy tops start to collect sunlight and make carbohydrates. Any time you destroy a weed's top and force it to regrow from stored reserves you weaken it. Repeated destruction will eventually kill it, that is, if you don't allow it time to replenish its reserves between your attacks!

When you mulch, try using newspaper, 8 to 10 sheets thick, covered with leaves. This will eliminate most of your weed problems. Few weeds can punch through, although they will find tears or gaps in the paper mulch. When they do, lay 8 to 10 sheets of paper over them and then some leaves to cover the paper. Remember, they can't hold their breath forever. Just stay with it once you start!

Repeated rototilling in the summer is very damaging to even persistent weeds. Allow them to resprout between tillings (sometimes a sprinkling is needed to get them to resprout) and then rototill again. Pick out nutgrass tubers or Johnsongrass runners that surface in the process and throw them away.

If you stay with it, you will win the war. Good luck!

-National Gardening Association

Next Up

How to Defeat Bermuda Grass

It's best to get the jump on this garden pest in spring.

How to Reclaim a Weedy Yard

Grow healthy grass and say 'goodbye' to those nasty weeds with these simple and easy-to-follow lawn and gardening tips.

When to Apply Herbicides

Gardening experts share tips on when to apply pre-emergent and post-emergent herbicides.

How to Cut Meadow Grass

Learn how to properly cut meadow grass with these step-by-step landscaping tips.

How to Combat Crabgrass

Unmanaged crabgrass can quickly overtake a lawn or appear along walkways or in pavement cracks during spring and summer months.

Improve Weed Control by Mulching

Constant weeding and mulching are what it takes to keep weeds from germinating.

How to Landscape With Prairie Flowers

Decorate your lawn or garden with soft prairie flowers to achieve beautiful pops of color throughout your outdoor spaces.

Six Ways to Prevent and Remove Weeds

Don't let weeds ruin your lawn and garden spaces. Learn how to kill weeds and prevent them from taking over your groundcover.

How to Kill Crabgrass

Battle this lawn enemy with these tips.

How to Handle Unexpected Weed Growth

Master gardener Paul James discusses how unexpected weeds may become residents in your yard and how to get rid of them.

1,000+ Photos

Browse beautiful photos of our favorite outdoor spaces: decks, patios, porches and more.


Follow Us Everywhere

Join the party! Don't miss HGTV in your favorite social media feeds.