I love this thing - have admired it for many years. It is unassumingly beautiful. Yellow, rayless, nodding flower heads stand up to 3' tall on erect stems arranged in a narrow branched cluster. It blooms from July to September and likes moist meadows and bottomland. It grows from way down low to way up high - so willing!
This plant will do fine in a garden - note that it needs water to establish and thrive.
While pre-treatment is unnecessary, a 30 day cool, moist treatment will aid in germination. Tiny seed should be barely covered - and pressed into to the soil for good seed-to-soil contact. I find it in full sun to partial sun.