To obtain a phytosanitary certificate for Plumeria, you must contact the plant protection authority or the equivalent agency in the exporting country. They will conduct inspections and assessments to determine if the plants meet the phytosanitary standards required for exportation to the US. If the Plumeria passes the inspections and meets the necessary criteria, the exporting country’s plant protection authority will issue the phytosanitary certificate, which should accompany the shipment of Plumeria during the importation process. It’s crucial to ensure that the certificate is accurate, valid, and complies with the specific requirements of the USDA and US customs.