Moss affects over 60% of UK lawns, thriving in damp, shaded, and compacted conditions common across Britain. Ferrous sulphate applied at 4g per square metre is the standard chemical treatment, blackening moss within 7-10 days. Dead moss must be scarified out within 14 days or it smothers the grass beneath. Spring treatment in March and April gives the best results, as grass is actively growing and can recover quickly.
Key takeaways
- Ferrous sulphate at 4g per square metre kills moss within 7-10 days
- Scarify dead moss within 14 days of treatment or it suffocates healthy grass
- March and April are the best months to treat lawn moss in the UK
- Soil compaction is the number one cause of moss in British lawns
- Aerate compacted areas with a hollow-tine aerator to a depth of 7-10cm
- Overseed bare patches within 48 hours of scarifying to prevent moss returning
moss lawn care lawn moss ferrous sulphate scarifying aeration lawn drainage overseeding
Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
