Plant Structure Plant Height

Plant height is a fundamental morphological classification that describes the mature vertical growth pattern of cannabis cultivars, ranging from compact dwarf phenotypes to tall, stretching varieties. Height expression is influenced by both genetic factors and environmental conditions including light intensity, photoperiod, and growing space. Breeders categorize strains into height classes—typically compact (under 1 meter), medium (1-2 meters), and tall (over 2 meters)—to match cultivation environments and breeding objectives. Height genetics often correlate with internodal spacing, branching architecture, and flowering time, making it a practical trait for selecting parent plants. Understanding height classifications helps growers select appropriate varieties for different grow rooms, outdoor settings, and cultivation techniques.

Breeders working with height genetics select for either compact growth suited to space-limited indoor cultivation or taller phenotypes valued for outdoor production and yield potential. Height selection is often combined with internodal distance and branching patterns to develop cultivars optimized for specific growing methods.