Magnolia Trees Damaged by Pool Salt Runoff: Fertilizer & Barrier Strategy

Salt Stress Confirmed: Arborist Was Right

Pool chemicals (chlorine, salt) leaching into root zones cause leaf drop and decline in magnolias. Roots extend well beyond the drip line.

Recovery Plan

1. Stop the runoff – Divert drainage away from tree roots (berms, French drain, redirect downspouts).
2. Fertilize with 10-20-10 (high phosphorus for flowering trees) – Brands like Jobe's or Bachman's. Apply fall & spring.
3. Wait for rain – Natural rainfall leaches salts out of soil over months.

Long-Term

Monitor soil salinity if possible. Keep pool backwash and splash zones far from valuable trees. Magnolias are salt-sensitive; prevention beats cure.