White Crust on Houseplant Soil: Mineral Deposits, Not Mold

Why Your Repotted African Violets & Ivy Develop White Soil Crust

Kathy repotted African violets and ivy three times; each time, soil turns white on top within weeks. She cleaned, used new soil, reduced watering—same result. Wonders if it's mold.

Expert Diagnosis from Darlene

Not mold—mineral/salt deposits from water. Hard water leaves residue. Overwatering can exacerbate it.

Solutions

• Use rainwater, distilled water, or add 1 drop dishwashing liquid (not gel) per cup of water for plants only. Surfactants soften water and improve soil penetration.
• Check soil moisture with finger or hydrometer—water only when needed.
• Regular tap water is fine for African violets (chlorine/fluoride negligible), but hard water harms long-term.