Cut back the stems after flowering or in early spring before growth resumes. The species H. autumnale is easily grown from seed, but hybrids are propagated from division or cuttings.

Do you cut back helenium?

Divide congested helenium clumps every few years, in spring or autumn. Heleniums die back over winter, so cut them back after flowering.

How do you prune helenium?

Pinch deer-resistant helenium back in spring to make it shorter and bushier, possibly at the cost of delaying flowering. Once it blooms, cut the flower stalks down to the foliage. Divide helenium every three years in the spring after it comes out of dormancy to ensure vigor.