Clone Drift

Clone Drift refers to the gradual phenotypic and genetic divergence observed when a cloned cultivar is propagated vegetatively over multiple generations across different growing environments and cultivation practices. Breeders and cultivators have documented shifts in plant morphology, terpene expression, and cannabinoid ratios even when propagating from the same mother plant material. These changes occur due to environmental factors, epigenetic expression, and accumulated stress responses rather than new mutations in nuclear DNA. Understanding Clone Drift is important for breeding programs seeking to maintain genetic stability and for producers managing consistency across harvests. The phenomenon highlights why seed-grown lines can sometimes exhibit more uniform expression than indefinitely cloned materials.

Breeders working with Clone Drift documentation use it to establish periodic re-stabilization protocols and to guide decisions about generational limits on clonal lines. Tracking Clone Drift helps distinguish between stable cultivar traits and drift-related variation when selecting parent plants for seed production or new crosses.