What is Theophrastus's Enquiry into Plants?

Written by the ancient Greek philosopher Theophrastus between 350 BC and 287 BC, Enquiry into Plants is a foundational work of natural history and the starting point for Western botany. Originally serving as lecture notes for his students at the Lyceum, the text spans ten volumes—nine of which survive—and covers plant structure, reproduction, geography, and medicinal uses. Along with works by Aristotle, Pliny the Elder, and Dioscorides, it remained deeply influential into the Renaissance.

What we know

• Theophrastus wrote Enquiry into Plants between approximately 350 BC and 287 BC in ten volumes, of which nine survive. [2]
• Theophrastus is often considered the father of botany due to his groundbreaking works Enquiry into Plants and On the Causes of Plants. [3]
• Book 9 of the treatise focuses on the medicinal uses of plants, describing extracted juices, gums, and resins, making it one of earliest herbals. [2]
• The condensed style and lists of examples in the manuscript indicate it was used as working notes for lectures to students at the Lyceum rather than as a finished book. [2]
• In the work, Theophrastus attempted a biological classification based on how plants reproduced, which was a first in the history of botany. [2]

Still open

• Whether the text was completely finished before the author's death remains ambiguous, as sources note it stayed in an unfinished state and was continually revised.

Where to go next

• whoWho was Theophrastus?
• a case in pointWhat did On the Causes of Plants cover?
• the bigger pictureHow did botany develop as a scientific discipline?
• how we knowHow was Historia Plantarum translated during the Renaissance?
• whereWhat role did the Lyceum play in ancient philosophy?
• an unexpected connectionHow did ancient Greek plant study connect to Renaissance herbals?Classical antiquity texts like Theophrastus's work were preserved and later reproduced or translated during the Renaissance, bridging ancient lecture notes with early modern botanical science.

Sources

• [1]History of Plants (Wikidata Q17156420) · CC0 1.0
• [2]Historia Plantarum (Theophrastus) · CC BY-SA 4.0
• [3]Theophrastus · CC BY-SA 4.0
• [4]Companion planting · CC BY-SA 4.0
• [5]History of botany · CC BY-SA 4.0