Yellowing Phalaenopsis After Root Loss: Recovery Plan

Phalaenopsis Turning Yellow After Root Rot Treatment

Ashley's Phalaenopsis: one leaf turned black/rotting, treated with Physan 20, cut leaf, treated again 2 weeks later. Now whole plant yellowing. Always low light near window. No new leaf growth; new stem protruding. Repotted August, trimmed dead/dying roots. Bottom roots okay, aerial roots dying. Mists aerial roots, avoids crown water. Asks if yellowing is natural regrowth or plant dying.

Expert Response

Ashley, if many roots lost, that causes yellowing. Roots nourish leaves; lost roots = leaf death. Leaves turn yellow progressively, fall. Need new root growth from roots in mix to support new leaves. Repotting helps. Aerial roots unimportant for potted plants—ancestral trait for tree growth. Pot culture doesn't provide humidity far from pot, so aerial roots stop, seal to prevent sap loss. Growing roots in pot is balancing act: better too dry than too wet. Check moisture near pot bottom before watering; water only when dry, then soak well. Use room-temp water, no softened water (salt). Fresh mix: water thoroughly weekly. Clear pot allows monitoring root growth and moisture. Water only morning. No crown rot—good job preventing water in crown. Don't let pot stand in water; drain hour after watering. Continue Physan 20 every couple weeks as preventative until plant recovers. Keep warm (65-80°F). Plants near window may get too cold at night. Phalaenopsis prefer east window for morning sun.