That's BEAUTIFUL, Marv.....kudos to your wife!
Here are some plants I planted about 5 years ago at Mom's on the side.
They are Cordyline australis 'Dark Star'.
Interesting plant both in growth habit and durability. Very cold hardy which is always a nice attribute for this area.
I will probably be pruning the taller stems this year to help produce more uniformity in this grouping.