King of Hearts appears to be a cultivar that should be put on the endangered list. As you can see, there is no commercial vendor for this rose and only two private rosarians growing it. This is probably down to the point that it needs to be shared by cuttings to keep it going along. It is apparent from the photo, the awards it has garnered, and the first generation offspring of this rose that this is an important rose as well as beautiful and should not be lost to rosedom. I have luckily managed to get a single bush of it for Spring 2010 and eventually will try to propagate it and share new plants with rosarians that would be interested in having one of them so long as they too would be willing to share cuttings with others to keep this cultivar alive. I will post as having cuttings available here on HMF when my plant is big enough but it may be a good idea to contact me through the mail system here on HMF to let me know you are interested in cuttings of this rose.
John Moody