Reviving a Tired Lawn: A Season-Long Plan

Moss, bare patches, and yellowing are almost always downstream of three causes: compaction, thatch, and shade. Seed and fertiliser applied without addressing those produce a short-lived improvement.

Diagnose first

• Moss with standing water after rain: compaction or poor drainage.
• Spongy surface, springy underfoot: thatch layer over 12 mm.
• Thin grass under trees or beside a fence: shade — change the grass species, not the routine.
• Yellow with a pale, even tone: nitrogen shortage.

The order of operations

1. Mow short, but never remove more than a third of the blade in one pass.
2. Scarify to pull out thatch and moss. Expect the lawn to look ruined; this is normal.
3. Aerate — hollow-tine if compacted, spike if merely firm.
4. Overseed at the full new-lawn rate on bare patches, half rate elsewhere.
5. Top-dress lightly with a sandy loam to fill the tine holes.
6. Feed with a balanced or autumn feed depending on the season.
7. Water consistently for three weeks — new seed cannot survive a dry spell.

Timing beats effort

Late summer to early autumn is the best window for cool-season grasses: warm soil, cooling air, and weak weed competition. Spring is the second-best option and mid-summer is the worst.