Hey Jude (Sorry, I couldn't resist) I have a Hippeastrum cybister hybrid named ‘Santana’ that is out of production. It is one of my treasures, which reblooms regularly although it produces small blooms. Is it possible that your ‘Sultana’ might be ‘Santana’? Even though I use long lasting opaque paint markers, I know that plant tags can become indecipherable over time. Regards, Blanca Point Reyes, California