Why have all these mushrooms appeared on my lawn?

Cool, damp weather after bouts of high  heat encourage fungus growth on  lawns. High, lingering overnight humidity and dampness is also an open invitation, so we strongly discourage watering in the evening.

We’ve finally had some long and heavy soaking rains in Late august and September. So we have seen an unusual amount of mushrooms sprouting.


Mushrooms come in a huge variety, and are not harmful to your lawn.

Fungus colonies grow outwards, forming “Fairy Rings” of mushrooms at their edges.

Fungi are nature’s garbage crew. On your lawn, they are breaking down dead organic material and freeing up those nutrients for your grass to use.

Mushrooms are just the fruiting bodies of the fungus. They’re the part that pops up above ground in your lawn to spread spores around. Most of the mushroom is underground, busily eating up old bits of wood, dead grass and leftover roots of plants that have been removed. Even animal poop is fair game for fungus.

You can easily kick, stomp, mow or rake the mushrooms as they appear if you want them off your lawn. They will grow back though, so long as whatever the fungus is eating is in your soil and the area is warm and damp enough for the fungus to grow.

If there is an old stump or buried construction debris, digging it out will remove the main source of your mushroom problem.

Good lawn cultural practices are still the best way to make your lawn unappealing to mushrooms.

  • Mow regularly so thatch does not build up. Do not leave long clippings (greater than 1″) on the lawn!
  • Aerate every year – the improved drainage and airflow that this practice develops will help prevent the soil from getting the kind of lingering damp that mushrooms love. LawnSavers can do this for you in Spring or Fall, starting at just $60.00 + HST. We service lawns throughout the Greater Toronto Area
  • Only water your lawn once a week- deeply, so your lawn has time to dry out in between lawn waterings.
  • Rake up any leaves, old mulch or other debris promptly so it doesn’t become fungus food.
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