Name Of 5ft. Perennial, Undergound Rhizome, Profilic Seeder In Fall, Yellow Coreopsis Type Flower Into Fall.

Question

These plants very hardy in central Ontario. Strong stems. The only name I’ve ever heard them called by is “tall yellow”. Not much help. Drought hardy like a coreopsis

Answer 1

Here are some possibilities:
Sneezeweed, Helenium autumnale
Jerusalem Artichoke, Helianthus tuberosus