Why is the black flower seldom seen on the earth?

I have heard that ther exist a black rose but it's very rare... They said that it is done through an experiment to make a black rose.. I don't think black rose is good during occasions and attractive for decorations..

I don't remember if i have ever seen a black flower . if their are really exist i want to have a look .and i have to say i don't like the flower which made with science technology . nature is beautiful because it's simple . the science make the nature complex . dear wangyinfeng ,if you know any kind of black flower please tell me .

Little black flower is related to sunlight.Black flowers can absorb all the sunlight waves,so that warming in the sun too quickly,it took the organization vulnerable to burns.Therefore,in the long-term process of evolution through natural selectipn,black flowers were fewer and fewer varieties,and not a pure black,purple is only partial.