One-Sided Browning on Italian Cypress in South Florida

Italian Cypress Turning Orange/Brown on One Side in South Florida

Four healthy Italian cypress show orange/brown discoloration on one side (bottom to top). Decorative rocks were removed for better drainage. Homeowner asks about soil pH.

Likely Causes

1. Rock mulch heat stress: Rocks reflect heat, compress soil, reduce water infiltration. The affected side likely faces the most sun/reflection.
2. Spider mites: Common on stressed cypress in hot, dry conditions. Test: tap branch over white paper—moving red specks = mites.
3. pH: Rarely the primary issue. Italian cypress tolerates wide pH range. Rock runoff can alter pH locally, but not the main driver.

Action Plan

• Mulch properly: 2–3″ organic (pine straw, bark) to drip line. No rocks.
• Check for mites: If present, treat with insecticidal soap or miticide (local nursery recommendation).
• Fertilize: 10-10-10 at 1 lb/inch trunk diameter, spring and fall.
• Water: 1 inch/week during drought only.

Key Takeaway

One-sided browning on Italian cypress in South Florida is usually rock-mulch heat stress or spider mites. Replace rocks with organic mulch, scout for mites, and fertilize moderately.