Botanical Description The Elecampane Inula helenium is a large, robust and outrageously showy perennial member of the Daisy family (Asteraceae) and is closely related to the Ploughman’s Spikenard Inula conyzae so frequent on local limestone soils. This imposing plant typically grows from 3 to 6 feet in height, has a spread of 2 to 3 … Continue reading Notes on Elecampane Inula helenium in the Doncaster region.