When I visited Wilhelmshöhe in 2014, the only labels roses had were numbers. I felt that was a huge mistake, because nowhere in the city was a guide to be bought, not even in the park's own office. There was a list online, that was all. And it's only in German. I don't know if they have changed the labelling by now. Here is the link: http://www.roseninsel-kassel.de/datenbank/rose.php