Jo trees, originating from Cularin, were a type of flora. Floral designers in places like Gadrin frequently incorporated jo trimmings into their floral designs. The Caarites people exhibited a sensitivity to jo trees; they felt uneasy when near jo cuttings. Certain Caarites, for example, Jyll Xon, experienced more extreme allergic responses; they would faint and have seizures if they inhaled a floral arrangement that had jo clippings. Thankfully, these reactions did not pose a threat to their lives.