Node Structure

Node structure refers to the spacing and arrangement of leaf nodes along a cannabis plant's main stem and branches. Breeders classify plants as compact (close nodes), moderate, or elongated (distant nodes) based on internodal length—the distance between successive leaf pairs. This trait directly influences plant height, canopy density, and light penetration, making it a primary selection criterion in breeding programs. Node structure is influenced by genetics, light conditions, and growth stage, with some lineages reliably producing tighter or more open architectures than others. Understanding node patterns helps cultivators predict final plant shape and optimize growing conditions for specific phenotypes.

Breeders select for node structure to develop cultivars suited to different grow environments—compact types for limited headroom or high-density systems, and open structures for improved airflow. Node architecture is often crossed deliberately to fine-tune canopy management traits without relying on growth regulators.