These roses are burgundy, which is as close as you can naturally get to black. Since they thrive in warm weather, you’ll need to live in a USDA zone 7B to grow them in your yard.
Water them every two days during the summer, or daily if the temperature exceeds 95 degrees Fahrenheit. Reduce watering to every three or four days when it's cooler out.
Remember to prune the foliage and remove dying flowers to increase the number of roses the plant produces. That way, all the energy is directed toward growing new blooms.
To grow black roses by dyeing white ones, start by growing a white rose variety of your choice. Whichever you choose, make sure they get at least six hours of sun each day.
Pick your roses just before they open all the way so that you can dye them. Find a non-toxic flower dye, mix it with water, and let the roses soak overnight.
The exact time depends on the dye’s strength, so be sure to check the label. Move them to a vase of clean water and allow a few days for the dye to transfer onto the petals.