Del. Code tit. 3 § 1306
When any plants, plant materials or nursery stock are shipped, sent or mailed into this State, to any person in this State, every carload, container, box, package, etc., shall be conspicuously labeled on the exterior with the name of the consignor, the state of origin and the name of the consignee. The aforementioned shipment shall have conspicuously affixed to its exterior, a nursery inspection certificate from the state of origin showing that the contents have been examined by a qualified state or federal officer and found apparently free from all dangerously injurious plant pests. It is the responsibility of both the consignee and consignor to examine all shipments for the presence of current and applicable nursery stock certifications.
3 Del. C. § 1306