Martha Daniell Logan (b. 1704, d. 1779) was an influential American horticulturist and botanist in 18th-century colonial South Carolina. Through her innovative planting techniques and introduction of diverse plant species, she significantly impacted agricultural practices. Logan's diligent studies and her work in cultivating seeds and plants bolstered the area's agricultural diversity. By disseminating her expertise via gardening guides and correspondence, she enhanced crop adaptability, supporting sustainable farming in the colony.