The Black Nebula carrot seeds The Black Nebula carrot is a highly attractive open pollinated carrot variety that was bred especially for the home gardener. The dark purple roots can be eaten fresh, roasted, steamed or used for dye. After the carrots grow too large to eat leave them in the garden and use for cut flowers. The white umbels are tinged with lavender on the edges and flower stems. Bees love carrot flowers so they make great food for pollinators.