Best eco-friendly way to control lawn moss?

The most reliable fix is improving drainage and air circulation - moss thrives in damp, compacted soil, so aerating your lawn and fixing water pooling spots actually addresses the root problem rather than just treating the symptom. If you want to speed things up, sulfur or iron sulfate work better than harsh chemicals and won't wreck your soil microbes. Honestly, though, some people just accept moss as part of their lawn since it's actually harmless and makes the turf softer underfoot, but that depends on what look you're going for.

Don't waste money on chemical moss killers - they're overkill and harsh on soil life. The drainage angle that's already mentioned is spot-on, but here's what people often miss: moss actually signals acidic soil. A soil pH test costs almost nothing, and if you're sitting below 6.0 or so, spreading lime in fall can shift conditions enough that grass outcompetes moss naturally over time. Combined with aeration, it's a one-two punch that doesn't require repeated treatments.

Raising your mower height actually does wonders because taller grass shades out moss and chokes it off naturally. Once you've got that dialed in, the drainage fixes everyone mentions will stick better - moss won't bounce back as fast when your turf is already competing for that space. It's a cheap shift that works alongside any other improvements you make.