All three lilies are like weeds here. The more they are ignored and mistreated the more tubers and new plants provided. At least Al and Miami Rose have beautiful flowers. I have a "purple Indian Goddess" at least that what it was called when I traded for it. When you let the pot dry out, all you did was to incourage it. The second tropical I ever bought was Dir Moore ( from Rich Sacher's American Aquatic Gardens) 15 years ago. The next spring by the middle of May nothing was happening in its pot. All my other lilies ahd returned nicely. I take the pot out of the pond and sit it by the shed. Two months later the soil was hard as a rock. I needed the pot for another lily. Being lazy I did not change the soil and stuck another lily in the pot. A couple of weeks later I check the pot and here comes the Director. I have overwintered Dir. Moore here in the ponds for 15 years now.
Did your Miami Rose return this year?