Vanguard might be triploid too. Flamingo, which I love, may be sterile. I dont know.
Flamingo, the wonderful single, pink Rugosa, never set seed for me nor did its pollen work on anything. I LOVE that rose and tried it every year for over a decade with NO results, or always failed results. I DO love that rose, though!
I tried ‘Flamingo’ years ago myself and had the same experience. I love it too and still keep it around.
Robert, if you have a spare spot, might I please get you to start that for me? I’d appreciate it! Thank you. Kim
Goldener Traum and Turke’s Rugosa are also potential non-diploid, non-anthocyanin/white types.