Diagnosing Bare Spots in Lawn: Sunlight, Compaction, pH, Drainage, and Fungus

Common Causes of Poor Growth

• Insufficient sun (most grasses need 6‑8 hrs).
• Compacted soil.
• Soil toxins (petroleum, herbicides, black walnut roots).
• Fungal diseases (fairy ring, etc.).
• Insects.
• Incorrect pH (target 6.5).
• Poor drainage or root competition from trees.

Step‑by‑Step Remediation

1. Till the entire area 8‑10 inches deep to blend soil layers.
2. Test drainage: dig 12″ hole, fill with water; should drain in 1‑4 hrs.
3. Check for white mycelial mats (fungus) just below surface.
4. Adjust pH, add organic matter, then seed with annual ryegrass as a test.
5. Water deeply but infrequently; keep moist until established.

If ryegrass fails, further investigation is needed.