Short Day Varieties

Short day varieties are cannabis plants selectively bred to flower within 8–10 weeks of continuous darkness, independent of photoperiod length. This classification encompasses both photoperiod-dependent cultivars bred for rapid flowering and day-neutral genetics like autoflowers that trigger bloom autonomously. Breeders working in this category often prioritize early-finish phenotypes to extend growing seasons in temperate climates and reduce overall cultivation time. Short day varieties became commercially relevant following the legalization wave, as growers sought faster crop cycles. Lineage records frequently report these traits emerging from 'fast' Indica-dominant crosses and Ruderalis-hybrid breeding programs. The classification remains distinct from traditional long-day or equatorial strains, which may require 12+ weeks under specific light schedules.

Breeders use short day genetics to create cultivars suited to northern latitudes, shorter outdoor seasons, and indoor production demanding rapid turnover. Stabilizing early-flower triggers while maintaining yield and cannabinoid expression remains a primary breeding objective in this category.