Their muddy, slimy composition also makes them difficult to remove without making a mess by smearing them over the grass.Īnother problem is that worm casts are incredibly fertile. That said, they can be as tall as 60mm and on an ornamental lawn, they look awful.Īnd if you have a large population of worms in your lawn, they can completely ruin the appearance. If your grass is fairly long you might not really notice them. It’s during these times when they leave their casts behind. In the UK, this usually means September into October and right through into spring if we experience a mild winter.Īs the soil becomes wetter, worms move to the surface to breathe, eat and reproduce – usually at night. You’ll notice more and more worm casts appear as the temperatures start to cool and the rains arrive. The slimy feel to them is the result of the worms digestive enzymes. They’re the excreted remains of their diet. Worm casts are small masses of slimy, muddy soil that gets deposited on the surface of your lawn by these 3 species. Of the three, the Lob, or Common Worm is the most common. Black-headed worms ( Aporrectodea longa). Lob or Common Worms ( Lumbricus terrestris). There are around 27 species of earthworm in the UK. Out of these species, only three produce worm casts. What Are Worm Casts and Why Are They a Problem? Those little slimy piles of muck can really ruin the look of your lawn, especially in September/October when the weather starts to cool and the rains arrive.īut the fact is, earthworms are good for your lawn and provide more benefits than problems.
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