What requirement must be met for a lot of more than one container to be exempt from labeling requirements?

For a lot of more than one container to be exempt from labeling requirements, it is essential that each container is marked with a lot number. The lot number provides a unique identifier for the entire batch, allowing for traceability and quality control. This enables regulatory authorities and consumers to reference a specific batch of seeds, which is crucial for ensuring compliance with safety and quality standards.

Marking each container with a lot number simplifies the logistics of tracking and managing the seeds, as it indicates that the seeds within are from the same production run or process, allowing for batch-specific information to be referenced without requiring individual labeling for each container. This requirement helps maintain organization and accountability in the handling and distribution of seed containers in a nursery setting.