We can grow some peonies, just Mike can't.
So. Calif. is much milder in the winter and the herbaceous peonies require about 400 hours of chilling temperatures. Zuzu has peonies, I think the tree peonies is what she said.
But Mike can try with a bit of effort:
http://freshdirt.sunset.com/20...
or
http://www.gardenguides.com/11...
And this site was very helpful, suggesting:
"VARIETIES FOR MILD CLIMATES
The most successful varieties for mild climates, according to Ross, are early blooming double-flowered peonies and any single-flowered and Japanese types (the early, mid-, and late season ones all do fine). Double varieties that bloom mid- to late season are poor candidates for mild climates: they may produce flower buds, but warm weather usually keeps them from opening properly.
And don't expect any peonies to reach their normal, cold-climate heights of up to 3 feet. In Ross's garden, the foliage grows to about 2 feet tall, with the flowers rising above the leaves.
Some of her successes include 'Charlie's White', 'Carol Charm', 'Doreen', 'Fairy's Petticoat', 'Krinkled White', 'Mons. Jules Elie', 'Mrs. F. D. Roosevelt', 'Richard Carvel', and 'Toro-No-Maki'."
http://findarticles.com/p/arti...