Worm Casts: They’re Good, They’re Bad & They’re Ugly!

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Worm Casts: They’re Good, They’re Bad & They’re Ugly!

Worm casts: They’re good, they’re bad and they’re ugly!

Undesirable yes, but did you know that worm casts are proof of good things happening under the surface?  

Worm casts, as muddy and annoying as they are, are a sign that there are earthworms in the soil which indicates a healthy, nutrient-rich soil ecosystem packed with lots of organic material and essential nutrients. But we do agree, the worm casts they leave behind can be jolly irritating and if you like a tidy garden and a mud-free patio, they’re bad news.


Recycling at its best | Earthworms are mostly seen as beneficial as they feed on organic waste, such as dead plants and soil, so they are big at recycling, helping in the breakdown of organic materials like the thatch layer on your lawn which can inhibit water, nutrients and food from reaching the grass roots.

Free aeration for your lawn | Earthworms also help to cultivate and aerate the soil, which allows air exchange and water to penetrate.  The annoying part is, the muddy messy coils they leave behind on the surface which can be rather unsightly.

How to Minimise the Impact of Worm Casts…

We would never recommend trying to rid your soil of earthworms because they are so good but there are a few things you can do to keep the mess caused by worm casts (and your stress levels) at bay.

  • If you have casts you want to disperse, first let them dry and then break them up by using a wire rake or brush them back into the lawn.
  • Keep to a regular mowing schedule
  • Regular fertilisation in the for of ongoing Seasonal Treatments (such as the So Green Spring, Early Summer, Late Summer and Autumn Seasonal Treatments) are a deterrent due to the acidity in the fertiliser, so there shouldn’t be as many earthworms coming to the surface.  
  • Collect grass clippings after mowing rather than leaving them to clump on the surface.
  • Aerate your lawn if drainage tends to be an issue because wet soil encourages the earthworms to come the surface for oxygen.

Not quite sure if worm casts are the problem? Think you have a pest? Send us a message or call us on 08000 665465 .