Mushroom in Lemon Hemlock Pot: Harmless Fungus, But Repotting Was the Real Mistake

A "Lemon Hemlock" (unidentified—no such plant exists online) was repotted from 1-foot tall into a 12-inch pot. Branches yellowed in indirect light, improved in west window. Then a bright yellow mushroom appeared overnight. Owner plans to remove mushroom and topsoil.

Mushroom Is Harmless

Fungus from non-sterile potting soil. Does not harm the plant.

Real Problem: Gross Overpotting

A 12-inch pot for a 12-inch plant guarantees root rot—excess soil holds water too long. Undo the repotting: remove all added soil, return original rootball to original or same-sized pot. This eliminates fungus and root rot risk.

Critical: Do Not Disturb Original Rootball

Removing original soil damages vital root hairs. Unnecessary repotting is the #1 cause of plant problems.

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