How to Fertilize elecampane?
Balanced large perennial feed once every three weeks spring to autumn

elecampane · Inula helenium
Also known as: allicampane; elf dock; elf wort; else dock; enula campana; horse elder; horse heal; scabwort; wild sunflower; yellow starwort
It prefers deep, rich, moisture-retentive soil in full sun or partial shade. May need support if planted in windy situation
Balanced large perennial feed once every three weeks spring to autumn