Multi Environment Testing

Multi-environment testing (MET) refers to the systematic evaluation of cannabis cultivars across diverse growing conditions—including varying light spectra, temperature ranges, humidity levels, and cultivation methods—to assess phenotypic stability and performance consistency. This breeding practice emerged as cultivators and seed producers sought to understand how genetic expression varies between indoor, greenhouse, and outdoor settings. MET data helps breeders identify which traits remain stable across environments and which are environmentally sensitive, informing selection decisions for commercial cultivar development. Lineage records from established breeders frequently document MET protocols used to stabilize new crosses before release. This approach is particularly relevant for developing cultivars intended for diverse markets or geographic regions with different production capab

Breeders conducting MET can identify heritable traits versus phenotypic plasticity, allowing more targeted selection for consistency. MET results inform decisions about cultivar recommendations for specific production systems and help predict performance across different grower environments.