Hi Christine. I’ve never made a cake with a continual cascade of flowers, but I have made one with a lot of flowers. I wired them together into arrangements about 8 to 12 inches long. They were pretty heavy, but when inserted them into their straws, they were as solid as could be. I did have the cake finished in a strong ganache (4 to 1 ratio). If you want to see my cake, it is the 50th Anniversary cake on my page. Hope this helps.
Sugar Sugar by SSmiley