7 C.F.R. § 319.37-23
(a) Postentry quarantine. One specific restriction that may be placed upon the importation of a type of plants for planting in accordance with § 319.37-20 is that it be grown in postentry quarantine. The Plants for Planting Manual lists the taxa required to be imported into postentry quarantine. Plants for planting grown in postentry quarantine must be grown under postentry quarantine conditions specified in paragraphs (c) and (d) of this section, and may be imported or offered for importation into the United States only:
(3) Costs and charges. All costs pursuant to any action ordered by an inspector in accordance with this section shall be borne by the person who signed the postentry quarantine growing agreement covering the site where the plants for planting were grown, or if no such agreement was signed, by the owner of the plants for planting at the growing site.
(Approved by the Office of Management and Budget under control number 0579-0190)