How to prune rattlesnake master

Fall after flowering, or early spring before new growth. Cut old flower stalks down to the ground-level rosette in fall or early spring. Clip individual seed heads before they mature if spread control is desired. No shaping or hard pruning is needed or beneficial.

Annually (seasonal cleanup); deadheading as needed. Rattlesnake Master (Eryngium yuccifolium) needs very little pruning. This architectural prairie plant largely cares for itself. Remove flower stalks before seeds ripen if you want to limit self-seeding. Cut spent stems back to the basal rosette in fall or early spring to tidy up — that is all it normally needs.

Cut old flower stalks down to the ground-level rosette in fall or early spring. Clip individual seed heads before they mature if spread control is desired. No shaping or hard pruning is needed or beneficial.