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There are about 27 species of worm in the UK but only three create worm casts at the surface of your lawn. These casts are waste soil that has passed through the worm as it moves around. This benefits the soil by increasing organic breakdown, improving aeration and fertility. They also ‘plug’ their holes with leaves and twiggs which can create an unusual landscape with upright leaves sticking up all over the& lawn. In summary, a lawn with worms is much healthier and will have fewer problems than a lawn without worms.
The downside is that the cast is a great place for weed seeds to germinate; they also create bumps in the turf and can quite often be unsightly. In fine sports turf they are a major problem but in anything other than an ornamental lawn they should be able to be lived with requiring only minor management.
Worms are great for the lawn, soil and for attracting wildlife. If you can live with the mess but want to reduce it a little then try these:
Worm killers are now banned as far as you are concerned. This means managing the situation is your only option. Start with all the points above plus:
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