Ponytail grass or Stipa is only hardy to
zone 7, so it probably didn't live through your Canadian winter. They are usually grown as annuals in colder areas. I planted 3 of them a few years ago and now I have lots more because they reseeded....I simply move the babies where I wanted them. But to answer your question, they grow green from the bottom up, but they are usually semi- evergreen, meaning they stay partially green with some die back (browning) also.