Moss in lawns / RHS Gardening (2024)

Here are our answers to your most common questions about dealing with moss in lawns:

How invasive is moss?

Mosses are a successful group of plants; they evolved long before flowering plants, occur on every continent, and have adapted to conditions where many other plants would struggle to survive. Despite their longevity and success, it is difficult to view mosses as invasive due to their slow growth and lack of true roots (they have shallow rhizoids that anchor them to a surface).

Even in ideal growing conditions, moss spreads slowly. The lack of a deep or spreading root system makes removal easy, but if growing conditions stay the same, moss is very likely to return. Sections of moss can re-establish after being disturbed. Mosses reproduce by tiny airborne spores; these can travel many miles and will germinate if they land in favourable (damp) conditions.

Do I need to get rid of moss from my lawn?

No – if your growing conditions are more suited to moss than lawn grasses, it makes sense to leave the moss to provide soft, low, evergreen ground cover that you can walk on and don’t need to mow.

What is the easiest way to kill moss in lawns?

If you decide you don’t want moss in your lawn, there are ways to remove it and actions you can take to prevent its return:

How to get rid of moss from a lawn:

• Scarify your lawn – ideally in October or early November when the grass is growing strongly, to remove moss. On a small lawn, or if the moss is only in a limited area, this can be done with a spring-tined rake. For a larger area, you could hire a mechanical scarifier. See our page on autumn lawn care for more information.   
• Use a bacteria-based moss remover – apply a product, such as Viano MO Bacter Organic Lawn Fertiliser and Moss Remover to remove moss naturally. The bacteria digests moss, so you don’t have to rake out unsightly, dead moss. It doesn’t remove it entirely, but usually makes a noticeable difference.

How to prevent moss growing in a lawn:

• Improve the health of your lawn – follow a programme of lawn maintenance in spring/summer and autumn to boost the vigour of your lawn. Moss is more likely to take hold in a lawn that has sparse or weak grass growth. If your lawn is in shade, choose a shade-tolerant grass mix, available as both seed and turf. 
• Adjust the growing conditions – it may be feasible to change growing conditions to favour lawn grasses and deter moss. Pruning nearby trees or shrubs can reduce shade. Aerating and top dressing your lawn (see our guide to autumn lawn care) will relieve compaction and improve drainage. In some situations, installing drainage will help, but bear in mind this is a major task and finding somewhere suitable for surplus water to be diverted to can be challenging.   
• Check the cutting height of your mower – avoid cutting the grass too short. See our guide to mowing, which includes suggested cutting heights. 
• Remove the lawn – consider replacing an area of shady or damp lawn containing moss with plants better suited to the growing conditions, such as shade-loving ground cover plants. Alternatively, if moss is thriving, embrace it and allow it to spread and outcompete the grass. Artificial turf isn’t an effective or sustainable option, as moss can establish in this too.

Can I compost or reuse moss?

Moss raked out of lawns can be added to your compost heap. It is slow to rot down in large quantities, so mix it with other ingredients. As moss is very widespread, any spores that survive the composting process won’t add significantly to the risk of moss forming in your garden. You can also add it to wildlife habitats, bug hotels, or leave some in spring for birds to add to their nests.

Fresh moss has many uses too – consider using it in flower arrangements or to linehanging baskets, adding it to a terrariumor dressing the compost in containers of spring bulbs.

Should I use a synthetic chemical mosskiller?

No, as non-chemical methods are effective at removing moss, there is no need to use a synthetic mosskiller. Also, bear in mind that control with a mosskiller will only be temporary unless the conditions that allowed the moss to become established are changed.

Many synthetic mosskillers contain iron sulphate and although it effectively kills the existing moss, the black, dead moss then needs to be raked up and removed from the lawn.

Can I use other household products to kill moss?

Killing moss with baking soda, vinegar, bleach, soap and other household products are frequently mentioned on the internet, but they should not be used to kill moss. They can kill grass and act as broad-spectrum insecticides, and are not HSEapproved lawn mosskillers.