Heartleaf Philodendron Sudden Wilt: Overwatering Diagnosis

3-year-old heartleaf philodendron ("Samson") suddenly wilts at top; leaves bright green, otherwise healthy. Expert Darlene: sudden wilt of green leaves = too wet. Recent accident or buildup over months. Pot must have large drain hole + tray. Water from top until moist + little in tray. Rewater only when top inch dry for 4 days AND pot noticeably lighter. Leaves look opaque when dry—water then. Increase light to help root recovery. Not a swamp plant—roots rot easily.