Angela, here's something else to keep in mind in growing and selecting garden peonies. If you are contemplating growing them for a cut flower business, this may be very important. Here in Maryland, all of the dozens of herbaceous peonies I've tried grow well. Peony bloom season here ranges from mid-April to early June. The temperatures during the mid-April to mid-May period are still moderate: there may be overnight freezes or more likely frosts during the early part of this period, and daytime temperatures do not go above 80 degrees F for long. The peonies which bloom during this period bloom beautifully. In many years, the temperatures begin to soar in late May and early June. Double flowered peonies which bloom during this time rarely produce good flowers. And if they do, the flowers do not last more than a day or two before they show signs of trouble. The colors are poor, faded or bleached and the form is often irregular. Single flowered peonies which bloom during this time open normally but frizzle in the heat right away. So I think you have two challenges to keep in mind: first you need to find peonies with a low chill requirement (the peony societies here in the US keep track of this and should be able to provide a list of cultivars suitable for warmer areas). Second, you need to find peonies which bloom during the coolest part of your spring. These typically will be the earliest blooming sorts. I don't know conditions in Western Australia at all, but I'll bet that late blooming double flowered peonies will not produce good flowers for you even if they survive, grow and produce flower buds. Good luck finding something suitable. Jim McKenney Montgomery County, Maryland, USA, USDA zone 7, where the last of the peonies are out there gasping for breath.