- Jäger, Peter, 1968-
- Jäger, Rolf
- Jäger, Wilhelm Friedrich, 1812-1834
- Jäger, Wolfgang, 1734-1795
- Jägerskiöld, Leonard A., 1867-1945
- Jäger-Zürn, Irmgard
- Jaggar, Thomas Augustus, Jr., 1871-1953
- Jaggard, William N.
- Jagger, Mary H.
- Jaggers, Richard E. (Richard Elmer) 1891-1973
- Jago, G.
- Jago, J B
- Jago, N D
- Jagodziński, Andrzej
- Jagoe, R B
- Jagou, Marie-Stella
- Jagtap, Suresh
- Jahan, Bushreen
- Jahan, Najlin
- Jahan, Nusrat
- Jahan, Sonam
- Jahanbanifard, Mehrdad
- Jahandiez, Émile, 1876-1938
- Jahir Hussain, K
- Jāḥiẓ, 868 or 869
- Jahn, Alex E
- Jahn, Alex E.
- Jahn, Alfredo, 1869-1940
- Jahn, August Friedrich Wilhelm Ernst, 1741-
- Jahn, E
- Jahn, Jaroslav Jilji
- Jahn, Laurence R
- Jahn, Linda
- Jahn, O
- Jahn, Olaf
- Jahn, Regine
- Jahn, Theo L
- Jahn, Theodore L
- Jahn, Theodore Louis
- Jahner, Josh
- Jahnert, R J
- Jähnig, Sonja
- Jahnke, R.
- Jahnke, S. M.
- Jahnke, Simone M.
- Jahnke, SM.
- Jahns, H M
- Jahns, Hans Martin, 1941-2017
- Jahr, K J
- Jahren, Hope 1969-
- Jahrmargt, K.,
- Jahromi, Sirous Tamaddoni, 1937-
- Jahufer, M Z Z
- Jahyny, Benoit
- Jai Rao, K
- Jaikaran, Samlal.
- Jaime De Pina, Iara
- Jaime-Ceballos, Barbarito
- Jaime-Rivera, Mario
- Jaimes, Juan C
- Jaimes, Juan C.
- Jaimes-Lopez J. Luis
- Jaimes-López, José Luis
- Jain, A P
- Jain, Atul
- Jain, Charchit
- Jain, M S
- Jain, Niren
- Jain, Payoj
- Jain, Prakrit
- Jain, R K
- Jain, S
- Jain, S K
- Jain, S P
- Jain, Seema
- Jain, Sohan L.
- Jainese, Conner
- Jairajpuri, M S
- Jairam, Rawien
- Jairam-Doerga, Sabitrie
- Jaireth, Hanna
- Jaishanker, R
- Jaisingh, Lloyd R.
- Jaiswal, Deepa
- Jaiswal, Shubham
- Jaiswar, Ashok Kumar
- Jaitly, Ak
- Jaitrong, Weeyawat
- Jaitrong, Weeyawat Jaitrong
- Jaiyen, Somruetai
- Jakamarra, Paddy Willis
- Jakati, Ram D
- Jakelaitis, Adriano
- Jakeman and Carver.
- Jakes, Pamela J.
- Jakhar, S R
- Jakhmola, S S
- Jakiel, Aleksandra
- Jakins, Catherine
- Jakl, Stanislav
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- Jaklitsch, Walter
- Jaklitsch, Walter M.
- Jakob, Elizabeth M
- Jakob, Hermann
- Jakober, Michael J.
- Jakobi, Hans
- Jakobitz, Jens
- Jakobs, Giselle K
- Jakobsberg, Grady O.
- Jakobsen, I
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- Jakobsen, Per Ploug
- Jakobsen, Sten L
- Jakobson, Georgij Georgievic
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- Jakobsson, Sven
- Jakosalem, P G C
- Jakosalem, Philip Godfrey
- Jakosky, Jay John, 1895-
- Jakovlev, Jevgeni
- Jakovljević, Miljana
- Jakowatz, Anton
- Jakowlew, B
- Jakowska, Sophie
- Jaksche, H
- Jaksić, F. M. (Fabian Miguel), 1952-
- Jakšić, Predrag.
- Jakšová, Patrícia
- Jakubec, Pavel
- Jakubowicz, Andrew
- Jakubowska, Janina
- Jakubowska, Natalia
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- Jakubska-Busse, Anna
- Jakubzik, Harry
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- Jakusch, Jens
- Jalaeian, Mahdi
- Jalal, Jeewan Singh
- Jalal, Pankaj Kumar Jeewan Singh
- Jalali, M. Amin
- Jalali, S. K.
- Jalalizand, Alireza
- Jalaludin, S
- Jalava, J
- Jalava, Jukka
- Jaldín Quintanilla, Rossmary,
- Jaleel, Ziyard
- Jalihal, D R
- Jalil, Nor-Eddine
- Jalili, Adel
- Jalilvand, Hamid
- Jalkanen, Joel
- Jalkotzy, Martin G.
- Jalland, G. H.
- Jalles-Filho, Euphly
- Jaloszynski, P
- Jaloszynski, Pawel
- Jałoszynski, Pawel
- Jalsrai, Ariunaa
- Jamaha, Nur Ain Nabilah
- Jamaica Agricultural Society,
- Jamaica. Board of agriculture.
- Jamaica. Botanical Department.
- Jamaica. Department of Public Gardens and Plantations.
- Jamaica. Dept. of Agriculture.
- Jamain, Hippolyte, 1818-
- Jamain, M Alexandre
- Jamal, Qaisar
- Jamala, Gailyson Y
- Jamali, Mohd Majid
- Jamaluddin, Jamsari Amirul Firdaus
- Jaman, M Firoj
- Jaman, Razali
- Jamault-Navarro, Catherine
- Jambon, Aurélie
- Jambs, F.
- Jambul, Rafi'Ah
- Jambulingam, P.
- Jambura, Patrick L
- Jamdar, Kartika
- Jamdar, N
- Jamdar, Nitin
- Jamee, Ahsan Rahman
- Jamel, CE.
- James A. Clausen (Firm)
- James A. Heydt (Firm)
- James A. Root Nurseries.
- James A. Rowan Nurseries.
- James Allen.
- James B. Wild & Bros.
- James Ballantyne and Co.
- James Bloodgood & Co.
- James Brodie & Sons.
- James Burn & Company,
- James Carter & Co.
- James Donovan (Firm)
- James Draper (Firm)
- James E, Zimmerman
- James E. Butts, Jr. & Co. (Firm)
- James Edgerton (Firm)
- James Edward Friend,
- James F. Failey (Firm),
- James F. Le Clare (Firm)
- James F. Mcguire (Firm),
- James Forbes Barclay (Firm)
- James Forbes Barclay (Firm),
- James G. Murray (Firm)
- James Galen (Firm)
- James H. Bissland & Son.
- James H. Bowditch (Firm)
- James H. Stebbins, Jr.
- James Hunter (Firm)
- James Hutchinson (Firm)
- James Hutchison (Firm)
- James I. George & son.
- James I. George (Firm)
- James J. McManmon (Firm)
- James J.H. Gregory (Firm)
- James Jeffrey & Son.
- James Jerome Hill Reference Library,
- James King (Firm)
- James King Nursery.
- James King Seed Co.
- James Krewson & Sons.
- James L, Sparks
- James L. Haven & Co.
- James M. Lamb & Sons.
- James M. Lamb (Firm)
- James M. P.
- James M. Thorburn & Company.
- James MacGregor (Firm)
- James Manufacturing Co.
- James McGregor (Firm)
- James N. Stearns (Firm)
- James Nisbet And Co. (London, England),
- James Nursery Co.
- James O. Toland (Firm)
- James Platts (Firm)
- James R. Gillette (Firm),
- James R. Osgood and Company,
- James Railton'S,
- James Rare Plant Nursery,
- James Ridgway and Sons,
- James Riley & Son.
- James River Garden Club, Richmond.
- James Smalley & Co.
- James Smalley & Company.
- James T. Bogue (Firm)