Chocolate Cherry Sunflowers are both rare and beautiful! Multi-branching plants plants grow 6-8 feet tall and produce deep mahogany flowers that are 5-8 inches across. There is some variation in color from almost crimson to dark chocolate (almost black) with some classic yellow mixed in. Chocolate Cherry Sunflowers are one of the prettiest sunflowers. They will definitely stand out in your garden and are perfect for cut flowers.