what is Perennials?

A perennial is any plant that lives more than two years and keeps coming up
year after year. There are thousands of different perennials. You will find
them in nurseries & catalogues.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)