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How to grow black rose

Choose a dark rose variety. There's no such thing as a 100% black rose, although breeders and genetic engineers are trying to make one.[1] However, the right growing techniques can make an extremely dark flower, with just a hint of red or burgundy. Start with a rose variety that produces dark flowers with a velvety texture. Ask a florist for more advice, or track down one of these varieties:
                                                                                                                                          
Plant in a greenhouse if possible. The exact color your rose ends up can depend on chance factors such as temperature and light. For best results, plant it in a greenhouse where you can control these factors precisely.                                                                                                                                                                                               Consider watering with floral dye. Some online sources recommend adding black food coloring to the water used to care for the roses. This is unlikely to work, since the roots will not absorb most dyes. If you want to try this, your best bet is to ask a florist for a professional florist dye. These are usually intended for cut flowers, not living plants, but they are less likely to harm your rose.                                                                                                                                                                                                                                                   Wait until buds starts to swell. When the closed buds first appear, the plant is still focusing its energy on growing the flower stems. When the stem has stopped growing and the bud begins to swell, the plant has reached a critical stage of development. 90% of the pigments that determine flower color are created after the bud is ¾ size, but before it opens.                                                                                                                                                 Experiment with temperature as the buds grow larger. During this stage, temperature can drastically affect color. Most rose varieties have not been researched in this way, so you'll have to be a pioneer. If possible, try different techniques on different buds or bud clusters. Here are some guidelines to get you started:                                                                                                
  1. Experiment with light. During bud development, keep Baccara roses shaded for a darker, bluer color. Other varieties may require sunlight in order to develop any color at all. When in doubt, try shading a few branches but keep the rest of the plant in sunlight.
                                                                                                                 

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