Winter, rain, shade: why paths turn slippery and lawns turn spongy

When the weather turns wet and the days stay dark, many gardens start to look as though they have been tipped on their side. Paving stones become a slick green surface, and the lawn feels more like a soaked sponge than a firm carpet of grass.

More and more amateur gardeners are now turning away from expensive specialist products from the DIY shop and reaching for a simple ingredient from the kitchen instead. Used properly, it can produce surprisingly long-lasting results against moss.

A few basic changes also help the effect last longer: improving drainage, letting in more light and clearing away leaves or other debris can make damp corners far less attractive to moss in the first place.

Why moss feels so at home in your garden

Moss never appears by accident. It exploits weak points in the garden very deliberately. If you understand the conditions it prefers, you can act more accurately and treat the problem far less often.

On the lawn: the ideal setting for moss

Moss spreads across grass most readily when the soil is in poor condition. Typical triggers include:

• acidic soil with a pH value below 6
• compacted ground that barely allows air to pass through
• areas that stay damp for long periods or become waterlogged
• plenty of shade from trees, walls or hedges
• thin turf with bare or patchy sections

Where the grass is weakened, moss moves in. It takes advantage of light and moisture, pushes out the grass and makes the whole area look increasingly sparse. If you only scrape off the green layer without improving the soil, the same thing tends to happen year after year: the moss disappears briefly, then returns reliably.

On paths and driveways: clean turns slippery

On paved paths, block paving and gravel areas, moss prefers to settle in the joints. After a few wet weeks, a neat walkway can quickly turn into a slippery strip where it is easy to lose your footing. In the past, harsh chemicals were often used for this job. Over the last few years, many of those products have been banned or heavily restricted for use in private gardens.

What people need are practical solutions that work without covering the whole garden in problematic chemicals.

That is where a well-known kitchen powder comes in, one most people would normally associate with baking or cleaning tricks.

Bicarbonate of soda against moss: how the kitchen powder works

The white powder gardeners praise is bicarbonate of soda, also known as sodium bicarbonate. Many people use it in cakes or for cleaning pots and grout. In the garden, it serves a different purpose: it alters the pH value at the surface and draws moisture out of the moss.

The result is that the green cushions turn yellow to brown within a few days, dry out, and can then be swept or raked away with ease. The key is to use only enough to remove the moss without damaging the lawn, joints or nearby beds.

Lawn treatment: targeted rather than all over the place

On grass, bicarbonate of soda should never be scattered randomly. It is meant to target the moss clumps, not the whole lawn. This is how many garden professionals approach it:

1. Mix the solution: Dissolve 30 to 45 g of bicarbonate of soda thoroughly in about 1 litre of water.
2. Wait for the weather: Choose a dry day when no rain is forecast for the next 24 to 48 hours.
3. Treat only the mossy areas: Apply the liquid directly to the moss patches using a spray bottle or a fine watering can, rather than over the whole lawn.
4. Leave it to work: Wait 2 to 3 days. During this time, the moss will change from green to yellow-brown.
5. Rake out and reseed: Remove the dead moss with a rake and lightly reseed any bare patches.

If your soil is very acidic, it is sensible to try the mixture on a small test patch first. If the grass reacts badly or discolours across a larger area, the dose was too strong or the lawn was already under too much stress.

Bicarbonate of soda is not a fertiliser; it is a problem-solver for specific trouble spots, and used incorrectly it can damage grass just as easily as moss.

Paths, patios and driveways: how to make the surface grippy again

On hard surfaces such as concrete slabs, block paving or brick, bicarbonate of soda is especially easy to use because there are no sensitive roots to worry about. Two methods have proved effective.

Dry application for joints and cracks

If you only want to treat joints and small moss patches, the dry method is the simplest:

• Sweep the path or patio thoroughly and remove loose soil and leaves.
• Sprinkle bicarbonate of soda lightly into the joints, using around 20 g per linear metre of joint.
• Work it in gently with a hand brush so the powder drops into the gaps.
• Natural moisture from dew and light showers will dissolve the powder gradually.

After a few days, the moss dries out, darkens and can be loosened with a scrubbing brush or yard broom. This method works well on reasonably clean surfaces where only the joints are beginning to green over again.

Liquid application for heavily moss- or algae-covered surfaces

If the whole surface has become slippery, such as a driveway or a shady paved path, a water-based solution is more effective:

1. Dissolve 30 to 45 g of bicarbonate of soda in 1 litre of water.
2. Apply the solution evenly over the affected area with a watering can or pressure sprayer.
3. Leave it for 1 to 2 days and, if possible, avoid walking on the surface during that time.
4. Afterwards, rinse lightly with water and brush away any loose residue.

The surface becomes less slippery without the need for aggressive patio cleaners. If you have pets, let the area dry fully before allowing a dog or cat to walk over it again.

How often can you use it - and when is it too much?

However practical bicarbonate of soda may be, it is still a substance that affects soil life and joints. Specialists recommend treating the same area no more than once or twice a year. If you sprinkle or water it on far more often, you risk the following:

• joints “die back” and nothing grows there for a long time
• lawn edges turn yellow and become patchy
• runoff water can damage flower beds or the vegetable garden

One more point: bicarbonate of soda solution should not be allowed to run into ponds or water features. Fish, frogs and aquatic plants can react badly to sudden changes in pH.

Without soil care, moss will keep coming back

The biggest mistake is tackling only the symptom. Anyone who wants to reduce moss for good has to address the causes, especially on the lawn.

Relieving the lawn: airy soil, less moss

Three measures make life much harder for moss in the long term:

• Scarify regularly: In spring and autumn, score the lawn with a scarifier or moss rake to remove thatch and let air reach the roots.
• Aerate and loosen: Puncture compacted areas with a border fork or use a lawn aerator so water drains away more easily.
• Improve drainage: Where the ground stays waterlogged, work in a thin layer of sand or, in more serious cases, rethink the whole soil structure.

Combined with suitable feeding and the occasional application of lime, where the soil is genuinely too acidic, this strengthens the grass and reduces the space moss can take over.

If one corner remains permanently damp because overhanging branches or dense hedges block the light, selective pruning can sometimes achieve more than repeated spot treatments.

After a wet spell, it also helps to brush away leaves and mud as soon as possible. A damp film on the surface is exactly the sort of environment moss needs to establish itself again.

Risks and practical everyday tips

Bicarbonate of soda is generally considered a relatively mild household remedy. Even so, it is still an active substance and should be used carefully. Children should not be able to get hold of the powder, and anyone with sensitive skin is better off wearing gloves during application. It is not a standard solution for moss or algae in pots or in the vegetable patch.

A useful everyday approach is to keep a small spray bottle filled with prepared solution and use it selectively when individual moss patches appear on a path. The important thing is not to drench the whole driveway out of frustration, but to target only the problem spots.

If you are working on a green roof, in joints around natural stone walls or on a timber deck, test the solution in an inconspicuous place first to make sure the material does not discolour. Bicarbonate of soda can react with some surfaces, especially delicate natural stone.

Used in the right dose, this kitchen powder remains an interesting tool for anyone who wants to keep a garden tidy without slipping on moss at every step or reaching straight for harsh chemicals.