Yard-Wide Stunted Growth: Soil Compaction, Nematodes, and Testing

Diagnosing Systemic Stunting

Miniature leaves and stunted growth across multiple species (oleander, lantana) in Phoenix indicate root zone stress—not a foliar disease. Common causes:

• Compacted soil—restricts root growth and water infiltration.
• Root-knot nematodes—microscopic worms feeding on roots, common in sandy soils.
• Extreme heat/salinity—Phoenix conditions exacerbate both.

Action Plan

1. Check soil compaction: Probe with screwdriver—if hard, aerate or vertical mulch.
2. Submit soil samples to county extension for nematode assay.
3. Amend with compost to improve structure and microbial life.
4. Water deeply, infrequently to leach salts and encourage deep roots.

Why Not a Spray?

Foliar treatments won't fix root problems. The issue is below ground—address the soil.