Self-gardening

I bought these orange lilies back in April-May but they wilted away because the weather was getting cooler. They completely disappeared for all of winter and just recently, in the last few weeks I noticed these random plants blooming and then.... MY FLOWERS RETURNED FROM THE DEAD!!!!

Pic 1 was taken when the second plant blossomed and Pic 2 was taken a day after!!!

My beautiful lilies!