This primary source commentary analyzes a letter (dated 28 July 1929) sent by Alexander Eig, botanist and custodian of The Hebrew University of Jerusalem’s herbarium, to Judah Magnes, chancellor and later first president of Hebrew University. This letter, which discusses the creation of a botanical garden connected to the university, shows how the emerging Jewish community of botanists at the newly established Hebrew University was carving out space for itself in the international community of botanical exp erts Moreover, the letter exemplifies the importance of people’s mobility in creating botanical knowledge, as well as the movement of plants, seeds, and other specimens, and highlights interaction between scientific institutions as an important aspect of nation building. Mandatory Palestine’s position as the "Holy Land," as well as its location across Middle Eastern and Mediterranean environmental spaces, made Jerusalem a unique and attractive center for botanical knowledge creation, as was recognized earl y on by the Jewish botanists in question.