Winter and during wet weather are the worst times for moss and algae growth which makes paths wet and slippery. Slippery surfaces are unsightly and dangerous and need treatment.

Physical Removal

• Algae can be removed by a pressure washer or stiff brush.
• Dislodge moss between paving by running a sharp knife along the cracks.
• Use a stiff wire brush on block paving. Try buy a long handled wire brush to save your back.
• Choose a dry sunny day so the surface has a chance to dry.

Chemical Treatments

• Most moss and algae treatments are biodegradable since harsher chemicals are banned by the EC
• Path Clear products in concentrate or ready to use are available from amazon
• Natural fatty acid products like Bayer Advanced moss killer use acetic, pelargonic and fatty acids.

• Surfacants are based on seaweed and sold under the Just Green brand.
• Patio Magic is biodegradable, pet and child friendly amazon
• Jeyes Fluid Path cleaner is my first choice.

Prevent Moss and Algea Build-up

• Trim back perennials and overhanging shrubs to improve air circulation
• Ensure surfaces slope so water runs off instead of standing.
• Chose permeable paving for new surfaces.
• Areas of shade are most prone to problems, plan accordingly.
• Improve drainage close to paths, remove blockages from drains and incorporate run-off channels in paths.

Other Tips

• On slippy wood tack some chicken wire to reduce accidents.
• On steps it may be worth spreading some coarse sand as an anti-slip.
• Treat algae in water butts and barrels to avoid spreading spores when you use the water.