In 1788 Martin was selected by Thouin as the first outstanding gardener to collect plant specimens for the Jardin du Roi in Madagascar and the Caribbean. The mission (1788–1789) was to the
Isle de France (Mauritius), taking European plants for cultivation, with instructions to collect useful indigenous and cultivated plants from the Mascarenes and take them to French colonies in the West Indies for introduction as new crops. He was to send spice and other plants to acclimatize in
Paris,
Cayenne (
French Guiana) and
Antilles gardens and was given extensive instructions by Thouin ('Memoire sur le transport des vegetaux par mer et par terre’) on how to collect and transport his botanical collections. This first mission was to the Isle de France, Joseph Martin sailing from Le Havre on 5 May 1788 in the
Stanislas arriving on 26 July. At the
Jardin du Roi, Pamplemousses he was hosted and trained by Director
Jean-Nicolas Céré from July 1788 to March 1789. He returned to France on 31 July 1789 having successfully introduced plants to Cayenne (French Guiana), Martinique and Santo Domingo (Dominican Republic) and brought herbarium material collected in Africa, South America and the West Indies for J.B. de Lamarck. He also found time to botanise on Madagascar and the Cape. Martin completed his brief by transporting spice plants to Port-au-Prince, and also returning plants to Thouin at the Jardin du Roi. ==Directorship in French Guiana==