Mountain ash grows well in full sun or part shade. Too much shade, however, will limit its flower and fruit production; for best flowering, be sure it gets at least 6 hours of sun per day.

An aesthetic byproduct of Sinabung's eruptions is this photo by Roni Bintang showing a hibiscus flower on an ash-covered plant in nearby Mardingding village: ...

"Wood ash from your fireplace or wood stove offers multiple benefits for the garden, particularly as a source of potassium. Potassium helps plants regulate water, flower, and produce fruit," he ...