I bought this Calla Lily last year at a Lowes garden center. When I walked into the garden center my eyes were immediately drawn to a display of black Calla Lilies that were labeled 'Hot Chocolate' and I picked one up. I'd been purchasing all the black flowers I could find last year for the black and green theme I want to develop in my garden.
When I got home I took a closer look at the tag and noticed it was labeled Zantedeschia 'Blackjack.' Out of the huge display I managed to pick up the one that wasn't labeled 'Hot Chocolate' but I'm still pretty happy with it.
On second thought, I am more than happy with this bloom- I am ecstatic! The plant tag describes the bloom color as a "deep purple-black" and it's close enough to black for my tastes. I have this plant growing in a pot so that I can hide it among other plants because I'm worried that someone will come into the garden and take it. If I'm not mistaken you can't reproduce these from seed, they have to be propagated by offsets or tissue culture to reproduce the color.