In this episode, we follow the castor plant, first encountered not in its expected homelands, but on a quiet hill in Bordeaux. From that moment, a single plant opens into a story that stretches across continents, histories, and ways of knowing. With its striking, hand-shaped leaves and spiny seed pods, the castor plant is as visually arresting as it is complex.
We trace its origins to regions across Africa and Asia, with deep roots in ancient Egypt, where its presence in early medical texts and burial sites signals both utility and reverence. From there, the plant travels, carried through trade, migration, and enslaved peoples, embedding itself in new landscapes and traditions.
At the center of this story is transformation. The same seeds that contain ricin, one of the most toxic natural substances, are also the source of castor oil, a substance used for centuries to heal, nourish, and sustain. We explore how different processing methods, from cold pressing to the roasting techniques behind Jamaican black castor oil, turn something dangerous into something beneficial.
Alongside its medicinal and cosmetic uses, castor oil has played roles in industry, energy, and global trade. But its journey is also deeply human, tied to the movement of knowledge across the Atlantic, where enslaved Africans carried with them not just seeds, but practices of care and survival.
