What do worm casting mounds look like?

Worm castings are small, round or oval shaped, and they usually have a dark color. They may be white, grayish brown, black or even green. They are very hard to see with the naked eye but you can see them better if you shine light on them. Worm castings often form in patches or clusters and they appear when water seeps into soil from above ground drainage channels (potholes).

How do worms get into your lawn?

Most likely, worms enter your lawn through holes in the soil caused by potholes. If there are too many holes in the soil, then it will be difficult for a worm to crawl out of each hole. Sometimes worms can also get into your lawn by digging under plants or roots that have grown over the top of the soil. Some types of weeds grow well in areas where there are lots of holes in the soil. These kinds of weeds tend to grow quickly and can cause damage to your lawn if not controlled.

Can worms make my lawn look dead?

No, worms cannot kill a healthy lawn. A dead lawn looks unnatural because it lacks life. Worms can only reproduce within soil and they do so by eating plant parts such as leaves, stems, flowers or fruit. This debris from worms’ food source is called worm castings or worm manure. It looks like small pieces of dark soil and can only be seen when you look closely. It is not possible for a dead patch to appear in your lawn due to the presence of worms even if worms are eating parts of it.

Can worm castings kill grass?

Worm castings cannot kill healthy grass. To kill grass, damage must occur quickly. This means, you would have to step on a single blade of grass and break it or spray paint the grass overnight. However, if you see patches of dead grass in your lawn, it’s most likely that the grass was already damaged before the worm castings appeared. It is also possible that the hose has been left on at some point in that area or that certain types of weeds are growing in your lawn.

If I have worm castings, should I get them removed?

No, worm castings are not harmful to your lawn. You should only remove worm castings if you find that they are damaging your plants or crops. Though worm castings can be dark in color, they actually contain many beneficial nutrients for plants and grass. It is believed they also improve the soil and make it easier for air and water to reach the roots of plants.

To sum up, you can see that worm castings are not dangerous to lawns. However, if you are concerned about the dark color of the castings, you can always choose to control the worms in your lawn. A good way to do this is by using a special chemical called nematodes. This liquid will kill all underground worms and insects that eat plant roots without harming other types of beneficial insects.

Do you need help with your lawn?

Our online store has all the supplies you may need, including nematodes.

Sources & references used in this article:

Ecology and management of earthworm casting on sports turf by PE Boyle, MD Richardson, MC Savin… – Pest management …, 2019 – Wiley Online Library

Earthworm activity: a source of potential disturbance of archaeological sediments by JK Stein – American Antiquity, 1983 – JSTOR

Effects of macrofauna on soil properties in tropical ecosystems by R Lal – Agriculture, ecosystems & environment, 1988 – Elsevier

Comparative impact of an anthranilic diamide and other insecticidal chemistries on beneficial invertebrates and ecosystem services in turfgrass by JL Larson, CT Redmond… – Pest Management …, 2012 – Wiley Online Library



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