Air Flow Phenotypes

Air Flow Phenotypes describe structural and morphological characteristics that influence how air circulates through a cannabis plant's canopy. These traits encompass leaf spacing (internode distance), branch architecture, stem thickness, and overall plant density—all of which affect gas exchange and microclimate conditions around flowers and foliage. Breeders and cultivators monitor air flow phenotypes because they directly impact susceptibility to mold, mildew, and pest pressures in different growing environments. Some lineages produce open, airy structures with wide internodes and sparse branching, while others express compact, dense phenotypes with tight node spacing and heavy lateral growth. Understanding these structural variations helps growers match plant genetics to their specific climate control capabilities and cultivation methods.

Breeders selecting for air flow phenotypes prioritize traits that reduce humidity pockets and promote light penetration, particularly when working with dense indica-type germplasm or developing cultivars for humid growing regions. Open-structure phenotypes are often crossed into genetics prone to botrytis or powdery mildew susceptibility to improve environmental resilience without relying on chemi