Helenium does best in full sun. Helenium does best in full sun in rich, moist soil, although many of the hybrids are more tolerant of relatively drier soil. Plants require watering during dry periods and may benefit from fertilization in early spring when growth resumes.

Will helenium spread?

The plants are characterized by lance-shaped foliage with stiff, upright stems that rarely need staking. Planted in early spring, helenium plants grow quickly to a mature size of three to five feet tall and spread to 24 inches wide.

How big does helenium grow?

Newly-planted perennials usually flower the first year, but will take at least one full growing season to mature. In areas that get plenty of summer rainfall, heleniums may grow up to 4 feet tall and need to be staked. If your plants regularly grow taller than you'd like, pinch back the new growth in late spring.