Bast Fiber Morphology

Bast fiber morphology in cannabis refers to the structural characteristics of fibrous tissues found in the plant's stalks and stems. These fibers, composed primarily of cellulose and lignin, form the plant's vascular bundles and provide mechanical support. Cannabis bast fibers have been cultivated and studied for centuries due to their potential industrial applications in textiles, paper, and composite materials. Plant morphology—including fiber bundle size, density, and arrangement—varies significantly across cultivars and is influenced by both genetics and growing conditions. Breeders and researchers classify cannabis plants partly by bast fiber traits when developing cultivars for fiber-focused breeding programs rather than cannabinoid production.

Fiber-focused breeders select for traits like stalk strength, fiber fineness, and bundle organization to optimize yield and quality for textile or pulp applications. Understanding bast morphology helps breeders distinguish dual-purpose cultivars (fiber and seed) from cannabinoid-dominant lines, informing selective breeding strategies.