Pittosporum Variegated Sudden Death: Root Rot or Overwatering

Diagnosing Rapid Decline

Three Pittosporum variegated planted last spring—one dead, two wilting/paling—in Southwest location indicates overwatering or root rot (Phytophthora/Pythium). Pittosporums need full sun, excellent drainage, and minimal shade.

Immediate Investigation

1. Dig up roots on declining plant—black, mushy = root rot.
2. If roots white/firm = overwatering.

Corrective Actions

• Cut water drastically—let soil dry 2–3" deep between waterings.
• If root rot: Apply fungicide drench (mefenoxam or phosphonate) per label.
• Isolate area: Disease unlikely to spread to Japanese magnolia, azaleas, geraniums, annuals.
• Ensure full sun exposure—thin overhead branches if needed.

Why Not Contagious

Root rots are soil-borne, not airborne. Nearby diverse plants have different susceptibilities. Fix drainage/watering; remaining Pittosporums may recover.