He attended a school in the vicinity of his home, and when he turned 16, worked for his father, intending to follow a business career.
[3] His interest in botany came from his acquaintance with an apothecary, John Wilmer, and Dr. Patrick Blair, a surgeon-apothecary from Dundee who practiced in London.
Martyn was one of the founders (with Johann Jacob Dillenius and others) and the secretary of a botanical society which met for a few years in the Rainbow coffee-house, Watling Street.
[3] In 1732 he was appointed Professor of Botany at Cambridge University, but, finding little encouragement and hampered by a lack of equipment, he soon ceased lecturing.
[5] He is best known for his Historia Plantarum Rariorum (1728–1737, illustrated by Jacob van Huysum), and his translation, with valuable agricultural and botanical notes, of the Eclogues (1749) and Georgics (1741) of Virgil.