He published numerous articles in magazines (Nova acta eruditorum) and edited the Kielische Gelehrte Zeitung (erudite newspaper of Kiel)[1] from 1771 to 1778.
He was taught by his father until the latter's death, upon which he was educated in Halle, attending the Franckesche Stiftungen from 1756 to 1760 and then studying theology, philosophy and the "fine sciences" (i.e. art history and aesthetics) until 1763.
His first marriage was in 1771 to Charlotte Amalie (von) Hausmann (or Husmann) (1740–1777), a Danish naval officer's daughter, with whom he had his only child Henrietta Georgina Amalia in 1772, who died aged two months.
Hirschfeld only ever gave one lecture specifically on gardening (on "hortorum culturam elegantiorem" in the 1780 summer term) and is mainly known for masterwork Theorie der Gartenkunst advocating the English landscape garden, based on Joseph Addison, Thomas Whately and William Chambers and best known in its French translation.
Hirschfeld's book transmitted the idea of English landscape gardens in a simplified form and contributed to their spread through Germany, Scandinavia and (via essays by Andrey Bolotov) Russia.