Fiber Phenotype

Fiber phenotype refers to cannabis plants selectively bred for elevated cellulose and lignin content in stems and stalks, rather than cannabinoid or terpene production. This classification describes industrial hemp and dual-purpose cultivars developed primarily for textile, paper, and building material applications. Breeders working in this category prioritize plant structure, stem diameter, and fiber bundle size—traits often inversely correlated with flower potency. Historical breeding records show fiber-focused lineages derive from tall, late-maturing landrace populations selected across Europe and Asia. The phenotype is genetically distinct from high-resin flower cultivars, representing a specialized breeding vector within Cannabis sativa.

Breeders targeting fiber production select for increased internode length, reduced lateral branching, and thick primary stems to maximize harvestable fiber per plant. These traits are managed through multi-generational selection and often combined with low-THC genetics to meet regulatory compliance for industrial hemp cultivation.