Money Tree Yellowing After Neighbor's Plant Arrived: Coincidence, Not Contagion

No Pest Transfer Likely

Yellow leaves dropping are rarely from pests. They signal light or water issues. Your friend's struggling plant didn't "infect" yours.

Light: Very bright indirect, within 6 feet of sunny window.
Water: Top quarter of soil dry between thorough waterings.
Consistency: Gradual root decline from slightly too wet/dry soil shows up suddenly.

Correct these; the plant will stabilize.

House Plants: Sap on Money Tree (Pachira aquatica) Leaves: What to Do?; Money Tree Leaf Drop After Stress: Correct Watering and Light Fixes; Money Tree (Pachira aquatica) Trunk Shriveling from Overpotting; Spider Mites on Money Tree (Pachira): Identification and Treatment; Money Tree (Pachira aquatica) Pruning and Seeds: Don't Prune If You Want Size; Repot Yearly Apr 15–Jun 15; No Seeds Indoors; Sick Money Tree: Scale Insects and Watering Stress; Money Tree (Pachira) Losing Leaves: Stabilize Environment; Money Tree Leaves Turning Brown & Transparent? Here's Why; Saving an Overpotted Money Tree (Pachira aquatica): Root Rot Diagnosis and Emergency Repotting; Pachira Aquatica (Money Tree) Care: Braiding, Light, Water, and Repotting

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