Plant Stretch Ratio

Plant stretch ratio describes the vertical growth pattern of cannabis during flowering, calculated by comparing final plant height to height at flower initiation. Breeders categorize genetics as short-stretch (minimal height gain), moderate-stretch (proportional growth), or high-stretch (significant vertical extension). This trait is influenced by both genetics and environmental factors like light quality and photoperiod. Understanding stretch ratio is essential for cultivation planning, space management, and selecting appropriate genotypes for indoor versus outdoor environments. Lineage records frequently report stretch characteristics, helping growers match plant architecture to their setup constraints.

Breeders working in controlled environments often select for lower-stretch phenotypes to optimize space efficiency, while outdoor breeders may leverage high-stretch genetics for canopy penetration and light capture. Stretch ratio is a key morphological trait used in stable line development and parent selection.