Costco Plant Contamination Timeline: from Store Opening to Multi-County Alert

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The warehouse giant built legendary customer loyalty on its generous, no-questions-asked return policy. Members routinely bring back wilting house plants, dead arborvitae, or brown shrubs for immediate, full refunds at member services counters.

In biosecurity incidents, that liberal return policy creates dangerous side effects. Transporting an infested plant back into a store parking lot and walking it through crowded checkout lines defeats containment efforts. Insect vectors can dislodge in vehicle trunks, take flight outside warehouse doors, or spread to other live plants staged along the entrance corridors.

Sacramento County agricultural officials issued clear instructions overriding standard customer return habits:

• Do not drive the plants back to the warehouse: Transporting quarantine-grade plant material violates state agricultural codes.
• Double-bag the specimens immediately: Encase the entire plant, pot, and soil base in heavy-duty plastic garbage bags and seal them tightly with tape.
• Contact county agricultural commissioners: Submit photographic proof of the plant and receipt directly to agricultural inspectors or warehouse customer support to secure transaction credits without moving the material.
• Inspect nearby yard foliage: Anyone who already planted these grapevines must examine adjacent vegetation for signs of leaf curling, feeding nymphs, or sudden yellowing.