1508 – Lumpy Lawn - PlantTalk Colorado

Home » Why Is My Lawn Lumpy » 1508 – Lumpy Lawn - PlantTalk Colorado

Maybe your like

Colorado State University

Extension

Contact your local county Extension office through our County Office List.

Online Directory

Close Icon PlantTalk Colorado Science-based gardening information for Colorado communities from CSU Extension, Denver Botanic Gardens, and Green Industries of Colorado. 1508 – Lumpy Lawn arrow

What are lumpy lawns caused by?

Lumpy lawns are common in Colorado and are caused by earthworms and night crawlers. Earthworms in a lawn are a sign of healthy soil because they eat thatch, grass clippings and other organic matter, recycle nutrients and aerate the soil. This improves the health of the lawn. Since worms are good for a lawn, it is best to mow the lawn as high as the mower can be set and leave the worms alone.

What can help smooth my lawn?

Lumpy lawn

However, worms build mounds of soil on the surface of the lawn, creating an uneven, bumpy surface. Aeration in the spring and fall, coupled with light rolling of the lawn, will help smooth the surface. A lawn roller is a machine with a weighted cylinder that rolls along the ground.

A light layering of compost or soil on the lawn from an adjacent flowerbed or vegetable garden can also be helpful.

For more information, see the following Colorado State University Extension fact sheet(s).

  • Lawn Care

Tell us what you think!

Do you have a question? Try Ask an Expert!

Search the Site

About PlantTalk

Resource for Colorado residents to find research based gardening information for the diverse Colorado climate. Newcomers to Colorado will find specific information to successfully garden in Colorado's diverse climate and geography.

History

Dr. James Klett discusses the history of PlantTalk Colorado. Click here to view the history of PlantTalk Colorado.

Recent Updates

  • Ash Tree Care
  • Extension Office Basics
  • Landscape Companies
  • How to Speak Landscaping
  • Buffalo Grass

Search Site

Employment | Equal Opportunity | Disclaimer | Non-Discrimination Statement | Privacy Statement | Provide Feedback | Webmaster | Apply to CSU | CSU A-Z Search ©2025, Colorado State University Extension, Fort Collins, Colorado 80523 USA

We are using cookies to give you the best experience on our website.

You can find out more about which cookies we are using or switch them off in settings.

Close GDPR Cookie Banner Accept Reject Close GDPR Cookie Banner Close GDPR Cookie Settings PlantTalk Colorado
  • Privacy Overview
  • Strictly Necessary Cookies
  • 3rd Party Cookies
Powered by GDPR Cookie Compliance Privacy Overview

This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.

Strictly Necessary Cookies

Strictly Necessary Cookie should be enabled at all times so that we can save your preferences for cookie settings.

Enable or Disable Cookies Enabled Disabled

If you disable this cookie, we will not be able to save your preferences. This means that every time you visit this website you will need to enable or disable cookies again.

3rd Party Cookies

This website uses Google Analytics to collect anonymous information such as the number of visitors to the site, and the most popular pages.

Keeping this cookie enabled helps us to improve our website.

Enable or Disable Cookies Enabled Disabled

Please enable Strictly Necessary Cookies first so that we can save your preferences!

Enable All Reject All Save Changes

Tag » Why Is My Lawn Lumpy