What to do with them now they are fading? Do I deadhead? Can I get seeds from them? Help, I loved how they turned out and would like more. I know they are biennials, so now what?
If you don't mind changes in color, let them re-seed. They don't breed true, but I always like to be surprised. If you insist on a certain color, yu need to deadhead and replant. If you choose to re-seed, trim the brown flower heads off once the heads are empty. I usually cut some of the flower heads off and lay them wherever I want a new batch to grow.