You think you don’t care about seedheads, I’ll bet. You like flowers, and maybe fragrance, and certainly fall color. (Yes, you’re nodding, you love fall color! Very good.) Here’s Vernonia noveboracensis, many weeks after finishing its long, late bloom. Nice, yes?
I’m not in a hurry to cut this back – it’s still tall and stately, and I haven’t had a lot of seeding in from this plant in my front garden. (I think this is because the seed wants to fly away on the wind, and if it flies more than a few feet it will hit the sidewalk.) So when you read in garden books that you must cut everything back, please remember – it’s a matter of when you prefer your work, and which consequences you’re avoiding. (More on this in spring, when I no doubt will regret at least a few of the chores I’m leaving undone this fall.)