Seed Vigour

Seed vigour refers to the overall metabolic capacity and growth potential of a cannabis seed, encompassing germination rate, early root development, and seedling establishment speed. This trait is determined by seed maturity at harvest, storage conditions, and genetic predisposition within a lineage. Breeders assess vigour through germination testing protocols and field observation of early-stage plant performance. High-vigour seeds typically show faster radicle emergence, stronger cotyledon development, and more resilient establishment under variable environmental conditions. Vigour is distinct from germination rate alone—a seed may germinate slowly but establish vigorously once sprouted. Maintaining optimal storage humidity (5–8%) and temperature (4–15°C) preserves seed vigour across generations.

Commercial breeding programs prioritize seed vigour when selecting parent plants, as it reduces losses during germination and early growth phases in large-scale production. Vigour stability across seed batches is a key quality metric for licensed seed breeders and cultivators establishing consistent crop performance.