How to run multiple harvests per year in a California greenhouse Light deprivation (light dep) is one of the most powerful techniques in California cannabis cultivation. By controlling when your greenhouse plants receive darkness, you can force flowering at any time of year — enabling 3-4 harvests annually instead of just one.
How Light Dep Works
Cannabis flowers when it receives 12+ hours of uninterrupted darkness (the short-day photoperiod response). In a light dep greenhouse, you pull blackout tarps over the structure at a set time each evening to artificially create long nights, triggering flower even during the long days of summer.
Best Strains for Light Dep
Fast-flowering strains maximize light dep efficiency. Our top picks: Cobra Chi #9 — 8-week flower, ideal for tight light dep cycles Purple Porcelain — 8-week fast finisher with stunning bag appeal Prime Punch — 8-week flower, fast veg, multi-tier ideal #34 Wedding Cake — 8-week flower with candy gas grape terps Tree Flip — Strong greenhouse performer, excellent yields
Light Dep Tips
100% blackout: Even tiny light leaks will cause hermaphrodites. Seal every gap in your tarps. Consistency: Pull tarps at the exact same time every day. Use timers for automated systems. Airflow: Greenhouses get hot under tarps. Ensure adequate ventilation to prevent mold. Use teens or talls to skip veg time and maximize cycles per year. Order clones in advance: Contact us 2-4 weeks before each cycle to reserve your strains.
Order Clones for Your Next Dep Cycle
HLVD-tested genetics ready for your greenhouse What Is Light Dep? → Fastest Flowering Strains for Light Dep → Greenhouse Growing Guide →
Related Articles
Ready to Get Started?
Browse our genetics menu or call us to discuss your growing needs.