Black Plants: 75 Striking Choices for the Garden by Paul Bonine

I am currently in the midst of a multi-year project of turning our front yard into a front garden and I've selected black, white, purple, and silver for my color scheme. This book is an excellent resource for choosing plants with either black flowers or black foliage. While a number of these plants overwinter only in tropical zones, there are a great many that will thrive here in zone 6. What a striking contrast they provide to plants in a more typical color palette.