(a) General. Plants, plant parts for propagation, and growing media originating from quarantined areas are prohibited entry into or through Texas, except as provided in subsections (b) and (c) of this section.(b) Exemptions. Plants produced from seed, planted and grown in sterile media or other suitable material determined by laboratory assay to be free of plant parasitic nematodes and protected from nematode infestation until shipped, are exempt from the provisions of this subchapter.(c) Exceptions. Shipments from quarantined areas may enter Texas if each package or bundle is accompanied by a phytosanitary certificate issued by an authorized representative of the state or commonwealth of origin that:(1) specifies the state or commonwealth of origin; and(2) certifies that the quarantine plants, propagative plant parts, and growing media have been sampled and determined by laboratory assay to be free of burrowing nematodes not more than two months prior to shipment and protected from nematode infestation until shipped. A laboratory analysis report should accompany the shipment. Comingling of plant material from any other origin or source is prohibited unless the plant roots and growing media have been sampled and determined by laboratory assay to be free of burrowing nematodes.