Maarn is a beautiful dahlia. My sister grows a lot of it. I don't think it makes seeds. Or at least I've never collected any. I walk through her fields in the fall scouting good plants with good seeds to find potential new seed parents.
I'm at the point where I don't have room to grow dahlias outside my own branded plants and a few plants I trial for seed parents. But I LOVE hearing about people's experiences with great dahlias.