The Garden Window  
   Offers tree peonies imported directly from China.
   http://www.thegardenwindow.com/

Golden Port International  
   Importers of Japanese and Chinese cultivars of peony trees.
   http://www.goldenport.com/

Heze East Flowers  
   China based grower of peony trees and paeonia rockii.
   http://www.ourpeony.com

Heze Guohua Peony Research Institute  
   Breeder and grower of Chinese herbaceous peonies and tree peonies.
   http://heze.51.net/index.htm

La Pivoinerie D'Aoust Peonies  
   Features field grown herbaceous peonies, including a variety of classic and older cultivars.
   http://www.paeonia.com/

Nature's Promise Peonies  
   Chinese tree peonies, herbaceous peonies, and Chinese herbaceous peonies. Offers a free newsletter.
   http://www.naturespromise.com/

Peony Garden  
   Iowa nursery featuring peonies and antique cultivars.
   http://www.peonygarden.net/

Peony Land  
   Offers a selection of Chinese tree peonies.
   http://www.peonyland.com/

Peony Meadows  
   Offers varieties of herbaceous and tree peonies.
   http://www.peonymeadows.com/

Peonynursery.com  
   Lithuanian breeders and growers of herbaceous and tree peonies. Sells hybrid peonies, including their own crosses, worldwide.
   http://www.peonynursery.com/

Roger's Fernleaf Peony Farm  
   Information on the history, growing, and purchase of Fernleaf Peonies.
   http://www.fernleafpeony.com/

Simmons Paeonies  
   Specialist root producers of more than 300 varieties of intersectional and herbaceous peony hybrids, both for the garden market and for commercial growers.
   http://www.peony.net.nz