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- Alicata, Antonio
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- Alice Earle Hyde (Firm)
- Alice Hills Baylor (Firm),
- Alice Meussdorffer Dahlia Gardens.
- Alice, Lawrence A
- Ali-Dinar, Hassan Muzzamil, 1949-
- Aliev, Halid A.
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- Alkmaar Citrus & Avocado Nurseries,
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- All Africa Leprosy and Rehabilitation Training Centre (Addis Ababa, Ethiopia)
- All America Garden Club.
- All America Selections.
- All Evergreen Nursery Company,
- All Hallows Guild.
- All Things Wild Consulting (Firm)
- Alla T. Mastick (Firm)
- Allabergenova, Komila
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- Allan Garland, John
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- Allee, Marjorie Hill, 1890-1945
- Allee, W. C. (Warder Clyde), 1885-1955
- Allega, Lucrecia
- Allegaert, Wim
- Allegan Nursery.
- Allegan Seed and Nursery Co.
- Alleger, W. W.
- Allegheny Forest Experiment Station.
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- Allegrezza, Marina
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- Alleman, Dudley.
- Alleman, H.
- Allemand, R
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- Allen & Ginter.
- Allen & Hancock.
- Allen & Sons Dahlia Gardens,
- Allen A. Lamond (Firm)
- Allen Bros.
- Allen Bush
- Allen D. Manwell (Firm)
- Allen Gerald R.
- Allen Nurseries.
- Allen Nursery Company.
- Allen, A. B. (Anthony Benezet), 1802-1892
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