Hello!
I grew this for the first time this year as my oddity ( I try to add something different every year).
The first hard frost has hit and the time has come to cut it down. But there is a collection of small plants around the base - next year's growth? I thought it was an annual.
I am going to leave them in place and cut down the long stalks to add to the compost heap. The seed heads are gracing a vase in the living room. Cheryl