About 1552–1578: Li researched and compiled the work for decades, marking a draft complete in 1578 and continuing to revise it. He used earlier books and contemporary information; broad claims that he personally tested every remedy or travelled throughout all China exceed the evidence.
1590–1596: The eminent writer Wang Shizhen dated his preface 1590. Printer Hu Chenglong began cutting blocks at Nanjing in 1593, the year Li died, and issued the Jinling edition in 1596. “1593” consequently appears in some catalogues as a publication date, but current historical studies generally distinguish the start of production from the 1596 issue (Nappi 2009).
Family production: Li's son Li Jianyuan helped secure publication, presented a copy at court in 1596, and is credited with the first edition's illustrations. Together with Hu Chenglong's printing work, his documented role makes clear that the printed Bencao Gangmu should not be reduced to the solitary achievement of one heroic author.
1603 and after: A Jiangxi printing added prefaces and Li Jianyuan's memorial. Later editions changed images and paratext and sometimes appended other works. A 1640 Wulin edition substantially recut the illustrations; a leaf in one edition cannot safely stand for every witness (Nappi 2009).
A court legend requires caution: The later Ming History claimed that the emperor ordered the book printed and circulated. Nappi notes that the contemporary palace record says only that the emperor saw it, the Ministry of Rites knew of it, and it was retained in the palace. That is evidence of presentation, not proof of an imperial publishing programme (Nappi 2009).