Silas Leachman (1859--1936) was a Chicago-based politician who specialized in ragtime songs enlisting African American dialects and stereotypes. He made his first recordings for the Chicago Talking Machine Company during the early 1890s before recording for Columbia later in the decade. He made his first Victor discs in 1901.
Clearly Leachman (or J. Tim Brymn who wrote the song) did not know much about Africa -- for one: coconut trees are not indigenous to Zululand. While overly romantic and quite divorced from reality, the song has a certain charm though.