How did Pliny the Elder contribute original observations to Roman botany?

In his encyclopaedic work, Natural History, Pliny the Elder made his most significant scientific contributions within the books dedicated to botany (Books XII through XIX). While he relied heavily on the earlier writings of Theophrastus, Pliny integrated several original observations, particularly those he gathered during his travels in Germany.12

His contributions to the field include:

• Horticultural and Agricultural Documentation: Pliny is a primary source for modern understanding of Roman gardens and the introduction of new plant species into Italy.1
• Agricultural Techniques: Book XVIII provides vital evidence regarding farm management and crop rotation. His description of an ox-driven grain harvester in Gaul, once doubted by scholars, was later confirmed by archaeological evidence.1
• Linguistic Preservation: By recording Latin synonyms for Greek plant names, he enabled the identification of many plants mentioned in earlier Greek texts.1
• Botanical Records: He documented the names of various legumes and other crops, serving as a crucial link to early botanical knowledge.1