Bela Lugosi has just started flowering for me. It usually blooms in the last week of October or the first week of November. It dies down over winter but still has leaves throughout the colder months. It produces lots of scapes and bud. I also find it a good increaser - even in clay. The colour varies from near black to purple, sometimes with a darker halo. It is very rust resistant.
The clumps benefit from urea and Alfalfa (=Lucerne) pellets.
PS Epsom's salts does not go astray either.