I love the black plants...I only have one in my garden, I have a black viola and it has grown so big this summer and bloomed all season.
Black is truly beautiful. So extraordinary. I think my wishlist for my garden is growing. (Boy this is painful - space is a problem)
I'm a big fan of black flowers too. I've got a black Calla Lily,Oxalis, bearded Iris, HollyHocks, and I grew Pansy Black Prince this year.
Sharon, Wayside Gardens has yet another gorgeous black plant for this spring... Delphinium elatum 'Chocolate' It is good for zones 3-10. My list of must have black plants just keeps growing and growing.