Loco's patronage of healing herbs corresponds to a real, still-practiced profession in Haitian society: the dokte fey, literally leaf doctor, a folk healer specializing in the identification and application of medicinal plants, who often works alongside, or independently of, the houngan and manbo who serve as full Vodou priests. In rural and urban Haitian communities alike, leaf doctors have historically provided, and in many places continue to provide, a significant share of everyday medical care, particularly where formal medical infrastructure is limited or costly, drawing on a body of botanical knowledge developed and transmitted across generations that draws together African, indigenous Taino and European plant lore accumulated over centuries in Haiti's particular environment. This knowledge is treated by practitioners as a serious, specialized craft requiring real skill and experience rather than casual home remedy, and it exists within, rather than apart from, Vodou's broader religious framework, since plants and their curative properties are understood as gifts and workings connected to Loco and to the spirit world more generally, not simply as inert natural substances.
Describing this tradition is not the same as instructing in it: the specific plants used, their preparation and their application are specialized, situational knowledge held by trained practitioners and not something to be reproduced from a general description, and any need for the actual practice of Haitian herbal medicine is properly a matter for those trained within it. What is safe and useful to note here is simply that Loco's patronage of the green world corresponds to an active, respected, living field of Haitian healing practice, not a symbolic association preserved only in myth.