Extreme Soil Acidity Under Former Lawson Cypress Hedge: Emergency pH Correction

The Crisis

After removing a large, old Lawson cypress hedge, 4 Melia azedarach (chinaberry) trees and star jasmine were planted. Three weeks later, all look unwell. Soil test: pH 4.5 (highly acidic). Lawson cypress needles acidified soil over decades.

Immediate Remediation

1. Apply hydrated lime (calcium hydroxide) per label rate for fastest pH rise. Water in thoroughly.
2. Re-test in 2 weeks. Target pH 6.0–6.5.
3. Expect 2+ applications. Hydrated lime acts fast but doesn't last; follow with pelletized dolomitic lime for sustained correction.
4. Monitor monthly until stable.

Why Hydrated Lime?

Works in days, not months like ground limestone. Critical for stressed, newly planted trees. Use caution—wear gloves, mask; it's caustic.

Plant Recovery Outlook

Melia and star jasmine prefer pH 6–7. If roots aren't permanently damaged, they should rebound as pH rises. Foliar feed with balanced liquid fertilizer to bypass root uptake issues temporarily.

Prevention for Future

Test soil before planting after conifer removal. Amend proactively.