| 1820 | Agricultural Society of India was established by Reverend William Carey on September 14 |
| 1824 | Introduced cash crops seeds which were brought from America and Mauritius |
| 1827 | First document on Agriculture and Horticulture in British India published by the Society |
| 1828 | First Horticulture Exhibition in India was hosted by the Society |
| 1830 | Sugercane and Tobacco was cultivated at Akra Firm of the society in South 24 Parganas |
| 1831 | Maize seeds were brought from America for cultivation |
| 1832 | Introduced Ginger from Jamaica and potato from England |
| 1835 | Established branches in Lucknow, Madras and Dinajpur |
| 1836 | Shifted to the premises of Royal Botanic Garden, Howrah. 25 more branches opened in India |
| 1838 | First Egyptian Cotton was grown |
| 1839 | Grafts of fruit plants were successfully procured and cultivated |
| 1840 | 32 varieties of wheat was brought from Europe and Egypt |
| 1841 | North India reports good quality potatoes from Society’s tubers. |
| 1843 | Cocoa plants introduced from West Indies |
| 1845 | Manchester Cotton Supply Association declares Rs.1000 prize for the best cotton grown in India with Society’s help |
| 1851 | Procures seeds of Mexican Cotton |
| 1853 | Import tobacco seeds from Cuba, Hungary and Columbia |
| 1854 | Rhea seeds imported from Scotland and England |
| 1858 | Introduces Bougainvillea spectabillis from South Africa |
| 1862 | Introduces ornamental plants |
| 1872 | Agri-Horticultural Society shifts to its present location at 1, Alipore Road, Kolkata |
| 1902 | Introduces Sralia (Panax) Balfouriana, the stalk that produces bud sprouts |
| 1907 | Raises a new hybrid cooperanthas by crossi9ng cooperia and zephyranthes |
| 1916 | Council of the Society sanctions Rs. 200 to purchase orchids to improve its collection |
| 1928 | Published first book “ An Amateur in an Indian Garden” by Percy Lancaster |
| 1933 | Raises hybrid cosmos and named it as “Alipore Beauty” |
| 1935 | Granted privilege to use the title “Royal” in recognition of its service, by King George V. |
| 1939 | Percy Lancaster of the Society awared Harvard Medal by Amaryllis Society of America for his achievement in hybriding Habrant-Bus texanas |
| 1940 | Lancanster raises hybrid named Malthea by crossing Althea rosea and Malr sylvesrisva |
| 1961 | Carey Institute of Horticulture set up in the Society to conduct certificate course in horticulture,affiliated to Calcutta University |
| 1962 | Birla Laboratory set up in society for R&D in horticulture and floriculture |
| 1963 | First Batch of 12 boys admitted to the certificate course. AHSI Laboratory recognized as Research Center for Ph.D studies |
| 1967 | Starts research under Dr. TK Bose on mist propagation, tissue culture growth and flowering and
improvement in yield and quality of ornamentals |
| 1967 | Standardizes micro-propagation techniques for different rooted ornamental plants. Organizes first national seminar on Horticulture |
| 1968 | Introduces Mussaenda Erythrophylla Pink and Queen Srkit |
| 1971 | Introduces training courses on gardening |
| 1979 | First Volume of “Horticulture Science” published by the Society |
| 1982 | Flower Show hall inaugurated by Dr. BD Pande, the then Governor of West Bengal |
| 1989 | Re-lays Rock Garden and constructs waterfalls in the garden |
| 1992 | Installs first phase of sprinkler system, commissioned deep tubewells and develops drainage system |
| 1993 | Introduces Giant Water Lily of the Amazon river. Introduced many uncommon varieties of plants |
| 1994 | Launches Mushroom Growing course |
| 1995 | Organises International Philately Show |
| 1996 | Develops laboratory facility for production of Mushroom spawns for the Mushroom growers. HE Dr. Shankar Dayal Sharma, the then President of India visits the society |
| 1999 | Development of Birla Enclave, Landcaping Belevedere and develops road and pathway |
| 2000 | Rebuilding Rose Garden and replanting with hybrid roses. Installed automatic Mist Chamber. Introduces Floral arrangement training course. Introduces Medicinal and Herbal Plant training courses |
| 2001 | Society receives exemption from donation under Section G of Indian Income Tax Act |
| 2002 | Pioneered State Mango Festival in Malda |
| 2003 | Develops Nursery, Orchids, Landscaping and Foliage plants |
| 2004 | HE Dr. APJ Abdul Kalam, the then President of India visited the Society. Launched PG Course in Herbology in collaboration with Jadavpur University. Plant Mela was organized for the first time |
| 2005 | Released Members’ Directory. Organized All India Rose Convention |
| 2006 | Published the Book “Encyclopedia of Himalayan Medicinal Flora” Vol. I”. Building a new Japanese Garden |
| 2007 | A new Fruit Orchard was designed and planted with exotic fruit trees. Central Lawn was extended. Two beautiful statues were placed at the vantage points of the garden |
| 2008 | Botanical Survey of India requested the society to conduct an intensive training program on Garden Maintenance and Herbarium techniques |
| 2009 | Published “Encyclopedia of Himalayan Medicinal Flora” Vol. II” under sponsorship of Horticulture Development Foundation |
| 2009 | A global workshop called “Good Medicine Works” on interacting with the revolution of Global
Ayurveda and Modern Medicine on 13 March 2009 |
