Zoysia Dying in Spots on a Slope: Fungus, Clay & Watering Fixes

Pull Test: Fungus or Drought?

Lee's zoysia dies in spreading spots on a bank. Tug the grass: if it comes up with few roots and slimy ends, it's brown patch fungus. If roots are dry and soil is hard, it's clay compaction or shallow watering.

Clay Soil Fix: Bark Mulch + Lava Sand

Till 4 inches cedar bark mulch 8 inches deep (50/50 mix). Top-dress with lava sand (20–40 lbs/1,000 sq ft). Opens clay, feeds microbes, holds water.

Watering: Deep, Not Daily

Sprinklers often wet only 1–3 inches. Roots rise to the surface, then fry. Water until soil is wet 6+ inches (cycle soak: run, wait 1 hour, repeat). Once weekly in heat. This builds deep, drought-proof roots.

Fungus Treatment

Horticultural corn meal: 10 lbs/1,000 sq ft, watered in. Treats brown patch and other fungal pathogens organically.

Slope Considerations

On banks, water runs off. Use soaker hoses or drip lines across contour. Mulch bare soil between plants to slow runoff.