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Yes Worm casts are good for the lawn. Don't Liston to green-lawn-man (Every neighbourhood has one, he's the guy in love with his hosepipe and box of chemicals). He hates worms! He can't stand seeing the tiny worm casts on the grass, so untidy ughhh. So, he kills worms using chemicals.
He just can't understand, or let it sink in, that the castings are actually nutrient-packed remains of digested plant matter and soil. A material that is extremely beneficial to the lawn. Instead, he rushes out to buy expensive chemical "remedies" that claim to fix poor soil when in reality what he is actually doing is wasting money. Creating a lawn that becomes shallow rooting and dependent on chemical fixes and wasteful watering schedules. Chemical companies love him.
Could also be a Covid denier like nutter Piers Corbyn, reliant on chemical fixes and bribery stings!
No apologies for the rant.
Worms do the hard work helping keep your lawn grass green by pulling fallen leaves and plant debris into the soil. Adding organic material which improves the soil structure as well as its fertility.
Worms also dig and aerate the soil by burrowing through the ground swallowing mineral particles and small amounts of plant material as they go. Mixing this up inside them and excreting it as casts on the surface. Worm casts are richer, finer and less acidic than the surrounding soil, and contain around 50 per cent more calcium, nitrogen, phosphorus, potassium and bacteria.
If worm casts really are a problem for you, let them dry out and brush them in.
Earthworms are in fact the best natural fertiliser your lawn can get.
As I said in my rant. I have seen people kill worms! Spraying fertiliser and weed killer on the grass and then sending their kids out to roll around on the freshly sprayed lawn less than an hour later. Meanwhile, the grass roots absorb the artificial stimulates. Just like feeding junk food to kids, giving them no need to grow deeper to look for the natural fertiliser the worms and micro-organisms which were just killed would have produced in the lawn. The grass becomes dependent on junk food (chemical fertiliser)
Lawn in a shady area
Moss is a small plant which does not flower.
It's not the reason for the poor lawns condition, but a symptom of something wrong! To much shade, cutting to short, mowing the lawn to often or not often enough, but most likely soggy areas brought about by poor drainage.
Waterlogged lawns or those with poor drainage produce moss very quickly.
Chemicals do not offer a long-term solution and won't solve the problem. For some effective drainage solutions that are installed under the lawn, see my lawn drainage page.