Miltassia Dark Star 'Darth Vader'

Just got this plant this year and it is growing like a weed. So far just one growth has flowered. It had 4 buds on the infloresence, but the oldest one didn't form quite properly and dropped off just before opening. Flowers stayed open for just over two weeks. Not a particularly good photo as it looks a bit washed out here -- but camera batteries ran out and flowers started to deteriorate by the time I bought replacement batteries.