Funny I did a google search and came to this. I was in Lowes today and saw a the lilies and remembered my casa blanca did not come back last year. Odd because in my old house I had them for more than ten yrs before I sold that house. I wonder what happened.
It could not be weather, I only moved fifteen minutes from my old property.
Maybe soil.
Maybe sun. My old property was shady it was so shady I grew the lilies with ferns. They bloomed later and the blooms lasted longer
I purchased six I will try some in the shade garden again and see if that is the secret for my longevity.