 He was sent to Senegal in 1816 as the colony's gardener-in-chief, but served without obvious distinction until the arrival in 1822 of Baron Jacques-François Roger (1787-1849) who entrusted to Richard the creation of an experimental garden on the left bank of the Sénégal River, near the village of Nghiao, and named it "Richard Toll" (toll means "garden" in the Wolof language).Richard was responsible for all plants, buildings, and facilities, and under his direction a number of new species were introduced to Senegal, including bananas, manioc, oranges, sugar cane, and coffee.In February 1824 Richard was sent to Cayenne.