I dont think they need any particular special care, just a good rich soil. They may not tolerate heavy frost when they are young, dont know if thats a problem in your climate or not?
Mark, you must have the patience of a saint if you are prepared to wait 5 years before it gets any taller than the grass!! I hope it means LONG grass!!
Very interesting information there Newt
I had one 20 years ago. I bought it when it was 6-8 inches high. I planted it in gravel and did nothing to it and it grew fine. I think once they get above the grass they grow up one year and out the next. It survived many frosts.
bob