What does it mean that the years are buried by ivy?

The poem "The Years Buried by Ivy" means that the past years have been buried by time, no matter whether the past love is true or not. In Ning's Simple Book, the author saw the horse in darkness, and when there was almost no hope in his heart, a voice came to tell him, "The years were buried by ivy, have you ever bloomed?" This sentence woke him up from his dream, and his side was filled with light in an instant, and then he woke up.