Lawn Mold, Fungus, or Moss? Diagnosis and Fix

First: Identify the Problem

"Mold & fungus" near tree lines in moist areas is often moss—not a fungus at all. Moss thrives in shade, moisture, and acidic soil.

If It's Moss: The Fix

1. Rake it out aggressively with a steel rake.
2. Apply lime heavily—50 lbs/1,000 sq ft—to raise pH.
3. Rough up soil to work lime in.
4. Overseed with shade-tolerant grass (fine fescues).
5. Water daily until established.

If It's True Fungus (Brown Patch, Dollar Spot)

• Confirm with local extension or lab.
• Apply labeled fungicide (azoxystrobin, propiconazole).
• Improve air flow, reduce irrigation, mow higher.

Follow Up

Reassess in 2–3 months. If moss returns, drainage or shade is still the root cause—address those for a permanent fix.