- Casado, Flávia
- Casado, Miguel A. (Miguel Angel)
- Casady, R. B. (Robert B.), 1917-
- Casagranda, Lloyd.
- Casagranda, M. Dolores (Maria Dolores)
- Casagrande, José Carlos
- Casagrande, Lilian I. Thomazini
- Casagrande, Marcelo
- Casagrande, Mirna Martins
- Casagrande, Richard A.
- Casagrande, T.
- Casais-e-Silva, Luciana Lyra
- Casal, Graça
- Casal, Manuel Aires De, 1754-1821
- Casale, Achille
- Casale, Jean-Francois
- Casaletti, Arcangelo.
- Casali, Carlos Aparecido
- Casali, Simone
- Casali, Vicente Wagner Dias
- Casalini, Ana Isabel
- Casalis de Pury, R. J.
- Casalla Daza, Robin
- Casals, Frederic
- Casamajor, Paul.
- Casamajor, Robert
- Casamatta, Dale A.
- Casana Martínez, Elena
- Casañas, Francisco García-Talavera
- Casañas, Hernán E.
- Casanave, Emma Beatriz
- Casanave, Kathleen
- Casane, Didier
- Casanova Katny, María Angélica
- Casanova, Bernadette
- Casanova, Jean-Paul
- Casanova, Michelle T.
- Casanova, Robinson
- Casanova, Rodolfo Polanco
- Casanova, Silvia M. C.
- Casanovas, Jorge G
- Casanovas, Paula V
- Casanoves, Fernando
- Casanowicz, Immanuel Moses, 1853-1929
- Casanueva, Maria E.
- Casares Gil, Antonio
- Casares Gil, José
- Casares Porcel, Manuel
- Casaretto, Giovanni, 1812-1879
- Casari-Chen, Sônia A.
- Casarin, Noemi
- Casarino, Jane Eyre
- Casartelli, Mayara Ribeiro
- Casas Andreu, Gustavo
- Casas de Puig, C. (Creu), 1913-2007
- Casas i Aznar, Ferran.
- Casas S., Rene.
- Casas, Alejandro
- Casas, Bartolomé de las, 1484-1566
- Casas, Graciela N.
- Casas, José M.
- Casas, Nicolás.
- Casas, William Beltran de las, 1857-1930
- Casaseca Mena, Bartolomé
- Casas-Valdez, Margarita
- Casatti, Lilian
- Casaubón, Edgardo A.
- Casaubon, Gerard
- Casavan, Kirk C.
- Casazza, Michael L
- Cascade County Conservation District.
- Cascade Gardens (Portland, Or.)
- Cascade Gardens (Sacramento, Calif.),
- Cascade Nursery Company.
- Cascade Nursery.
- Cascante Marín, Alfredo Mario, 1967-
- Cascio, David Keith
- Casciotta, Jorge R.
- Casco Castle Gladiolus Gardens.
- Casco, Sylvina Lorena
- Casco, Victor Hugo
- Case, A L
- Case, Dennis
- Case, E. C. (Ermine Cowles), 1871-1953
- Case, E. L.
- Case, Francis M.
- Case, Frederick W., 1927-2011
- Case, Gerard R.
- Case, H. C. M. (Harold Clayton M.), 1890-
- Case, James F.
- Case, James. W.
- Case, Joan
- Case, L. B.
- Case, Laurie J.
- Case, Loyal, 1807-1865
- Casé, M. C. C.
- Case, Martha A
- Case, Ray
- Case, Roberta B
- Case, Ronald M
- Case, Ted J., 1947-2015
- Case, Thomas, 1844-1925
- Case, Verna Miller
- Case, William
- Casearius, Johannes, approximately 1642-1677
- Casebeer, Richard S
- Casella, Eleanor Conlin, 1969-
- Casella, Janaína
- Casella, L. P. (Louis Pascal), 1812-1897
- Casella, Stefania
- Caselle, Jennifer E
- Casem, Merri Lynn
- Casement, Brendan.
- Casement, Michael
- Cases, Antoni
- Casevitz-Weulersse, Janine
- Casey, Ciara
- Casey, D. A. (Dermot Armstrong), 1897-1977
- Casey, Daniel.
- Casey, Denise E.
- Casey, E. J. (Edmund Jeremiah), 1924-
- Casey, Joseph P.
- Casey, L. R.
- Casey, Paul D., 1887-
- Casey, Raymond, 1917-2016
- Casey, Richard J.
- Casey, Thos. L. (Thomas Lincoln), 1857-1925
- Casey, Tonnie L. C.
- Casgrain, A. Chase
- Casgrain, H. R. (Henri Raymond), 1831-1904
- Cash Nurseries.
- Cash, Edith K. (Edith Katherine), 1890-1992
- Cash, Herbert J.
- Cash, James, 1839-1909
- Cash, John Theodore, 1854-1936
- Cash, L S
- Cash, Mary
- Cashatt, Everett D.
- Cashman Nurseries (Owatonna, Minn.)
- Cashman Seed Company.
- Cashman, J. E.
- Cashmore, P
- Cashner, Robert C.
- Cashtown Nurseries.
- Casillas, Federico
- Casillas-Hernández, Ramón
- Casimir, Christian
- Casimir, Max
- Casini, Paolo M.
- Casinos, A. (Adrià), 1947-
- Casiraghi, Alice
- Casiraghi, Maurizio
- Caskey, Amber D
- Casler, Clark
- Casler, L. C.
- Casley-Smith, J R
- Casmuz, Augusto
- Casna, Nancy J.
- Caso, Beniamino, 1824-1882
- Caspari, Ernst
- Caspary, Robert, 1818-1887
- Casper, Brenda B
- Casper, Gary S
- Casper, S. Jost (Siegfried Jost), 1929-2021
- Caspers, Nick.
- Caspers, Norbert
- Caspeta-Mandujano, Juan Manuel
- Cass Nurseries.
- Cass River Nurseries.
- Cass, A. R. Harris
- Cass, James.
- Cassá de Pazos, Liliana A.
- Cassady, Edithe Jane
- Cassady, John T. (John Thomas), 1909-
- Cassagnau, Paul, 1932-2016
- Cassaing, Jacques
- Cassan, Jean-Jérôme
- Cassanego, Mara Betânia Brizola
- Cassano, Aline Olian
- Cassano, C. R. (Camila Righetto)
- Cassano, Valéria
- Cassar, Thomas
- Cassaro-Silva, Marta
- Cassatt, Edward Buchanan, 1869-
- Casscles, J. Stephen
- Cassel Nurseries (Mantua, Ohio)
- Cassel Nursery (Mantua, Ohio)
- Cassel Nursery Company (Cleveland, Ohio)
- Cassel, J. Frank, 1916-2004
- Cassel, M.
- Cassel, Mônica
- Cassel, S. H.
- Cassell, Petter, Galpin & Co.,
- Casselman, Amos B.
- Casselman, Karen Diadick
- Casselman, Lisa M.
- Cassel's Seed Store.
- Cassels, Elsie 1864-1938
- Cassels, Hamilton, 1854-1925
- Cassels, Richard
- Cassemiro, Fernanda A. S.
- Cassens, A.
- Cassens, Daniel L. (Daniel Lee), 1946-
- Casset, María A.
- Cassey, Phill
- Cassey, Phillip
- Cassia, María C.
- Cassidy, Alan C.
- Cassidy, Gertrude Henderson
- Cassidy, Joseph D
- Cassidy, Kelly M
- Cassidy, Paul M. (Paul Michael), 1940-2016
- Cassidy, Rodney
- Cassidy, T. P. (Tom Part), 1890-1968
- Cassidy, Tamar
- Cassien, V. (Victor), 1808-1893
- Cassimiro, Jéssica Cristina
- Cassimiro, José
- Cassin, John, 1813-1869
- Cassinello, Jorge
- Cassini, Alexandre Henri Gabriel De, 1781?-1832
- Cassini, Carla
- Cassini, Carla S
- Cassini, Guillermo H.
- Cassini, Jean-Dominique, 1748-1845
- Cassini, Marcelo H.
- Cassinis, Giuseppe
- Cassino, Paulo César Rodrigues
- Cassino, Samuel Edson, 1856-1937
- Cassirer, Frances.
- Cassis, David
- Cassis, Gerasimos
- Cassol, Ana Paula Vestena
- Cassol, Angélica Soligo
- Cassol, Bibiana
- Cassola, Fabio
- Casson, Herbert N. (Herbert Newton), 1869-1951
- Cassone, Felice, 1815-1854
- Cassone, Jimmy
- Casström, Samuel Niklas, 1763-1827
- Cassulo, Luigi A.
- Cast, Robert L.
- Castagna, Michael
- Castagna, М
- Castagnaro, A. (Atilio), 1960-
- Castagne, Jean, 1785-1858
- Castagne, Louis, 1785-1858
- Castagneyrol, Bastien
- Castagnoli, Steve
- Castagnolli, Newton