Commonly known as a Grass Tree
A genus endemic to Australia, occurring in all national states and territories.

The rate of growth of Xanthorrhoea is very slow. However, this is often generalised to mean they all grow at the rate of about an inch (2½ cm) per year. Actually, after the initial establishment phase, the rate of growth varies widely from species to species. Thus, while a five-metre-tall member of the fastest-growing Xanthorrhoea may be 200 years old, a member of a more slowly growing species of equal height may have aged to 600 years

This second one grows at home...click on the blue square