Fusarium patch (or snow mould) affects gardens of all sizes and varieties. Discover what you can do to protect your lawn from snow mould this winter, including scarification treatments, and how it can be treated if you’ve already seen the effects. Looking after your lawn ensures it looks fantastic all year around and it's also good for the environment! Read more...

What is Fusarium Patch?

Fusarium patch, which is also known as snow mould, is a type of fungus that affects turf grass. It is seen most commonly in autumn and winter when the wet weather combines with snow or leaf covering, making the perfect conditions for fusarium patch (snow mould) to thrive and damage your lawn.

Fusarium patch is sometimes also referred to as pink snow mould - as one stage of the fungus can appear pink - or microdochium patch - as the fungus that causes the pink variety of the disease is called Microdochium Nivale. There is also another variety which is grey snow mould - typhula incarnate. It can be a hard disease to control, so the very best thing is to try to prevent it. However, it can be treated effectively and lawns can fully recover within a relatively short space of time.

What Causes Fusarium Patch?

The fungus, although it can survive temperatures below freezing, doesn’t grow well below freezing. However, a layer of snow over the grass keeps the grass insulated from the freezing temperatures, providing the perfect conditions for snow mould to thrive.

Microdochium Nivale loves moist and damp conditions. When snow or leaves layer over grass, they not only protect the fungus from frost but also prevent moisture from evaporating. It creates extremely damp conditions, allowing the fusarium patch to develop.

Layers of cover also increase the amount of carbon dioxide around the grass and fungus, helping the fusarium patch to grow.

The fungus’ spores are usually carried into the garden via the wind. The lawn can be infected during summer and the snow mould begin to grow, but won’t be noticeable until autumn or winter’s wet weather conditions, combined with a decreased rate of grass growth.

What Does Fusarium Patch Look Like?

Fusarium patch is most noticeable when snow begins to melt, but you can also spot it in other circumstances such as when you move leaves that have sat on grass for a long time.

It first appears as yellow patches of drying grass, which then turn to brown. These patches quickly get larger with wet weather. You might be able to see a grey or pink fungal growth at the edge of the patches.

Preventing Snow Mould

It’s not always possible to prevent snow mould, but there are steps you can take to ensure your garden is as protected as possible.


Making sure your lawn is fully aerated before winter helps water to drain through your lawn. This lowers the risk of extreme wet conditions which otherwise allows snow mould to thrive.

Raking & Shovelling

Keeping leaves from building up on your lawn and shovelling snow will help to prevent fusarium patch from developing.


It can also be helpful to improve the airflow through your garden by pruning and cutting back large plants that could restrict air movement. This will help moisture dry faster from your grass and help to minimise the chance of snow mould developing.

Treating Snow Mould

If you’ve spotted fusarium patch (or snow mould) on your lawn, then get in touch with Greensleeves Lawn Treatment Experts. We have aeration and scarification services that can help your lawn to recover from fusarium patch and other fantastic tips to help you get your grass back to full health.

Why not explore more of our fantastic blogs, such as 'How to Start Gardening' or our other information-packed resources?