Description Ageratina altissima ‘Chocolate’ Synomyn Eupatorium rugosum ‘Chocolate’. White Snakeroot. A clump forming perennial which has deep purple stems and oval leaves. From July to August, rounded sprays of off-white flowers are borne at the tips of the stems. Grow in moderately moist soil in full sun or partial shade. It will reach a height of 1.8m and a spread of 60cm.
