Plant Production Ltd.
Planthaven, Inc.
Podaras Peter
Portman Faye
Poulsen Roser A/S & Raymond J. Evison Ltd.
Poulson Roser A/S
Pounders, Jr. Cecil T.
Poutiatine Marcia M.
Pride of Place Plants
Probasco Eugene G.
Protected Plant Promotions Australia Pty. Ltd.
Protected Plants Promotions Australia Pty. Ltd.
Proud Andrew
Proud Andrew Scott
Psenner Thomas
Q.C. Stolwijk + Co. B.V.
Quemard Pascal
Ranney Thomas
Ranney Thomas G.
Rare Plant Research