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Guide","2025-12-26",{"featured_image":470,"url":476,"title":477,"updated_at":478},{"id":36,"alt":471,"path":36,"large":473,"original":474,"user_context":475},{"au":472,"ca":472,"de":472,"en":472,"fr":472,"nl":472,"nz":472,"uk":472,"us":472},"A massive, dense cannabis cola bending under its own weight, illuminated by warm grow lights, with a blurred background of a thriving indoor garden.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fheavy-harvest-ready-colas.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fheavy-harvest-ready-colas.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fau\u002Fblog\u002Ffast-flowering-cannabis-for-multiple-harvests","Top 5 Fast-Flowering Cannabis Strains Perfect for Multiple Harvests Per 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Harvests","2025-11-27",{"featured_image":490,"url":499,"title":500,"updated_at":501},{"id":36,"alt":491,"path":36,"large":496,"original":497,"user_context":498},{"au":492,"ca":492,"de":493,"en":492,"fr":494,"nl":495,"nz":492,"uk":492,"us":492},"8 Easy Photoperiod Cannabis Strains for Beginner Growers","8 Einfache Photoperioden-Cannabis-Sorten für Anfänger 🌱","8 Variétés Photopériode Faciles pour Cultivateurs Débutants","8 Makkelijke Fotoperiode Cannabis Strains voor Beginners","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Ftop-8-easiest-photoperiod-cannabis-strains-for-beginner-growers.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Ftop-8-easiest-photoperiod-cannabis-strains-for-beginner-growers.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fau\u002Fblog\u002Ftop-7-easiest-photoperiod-cannabis-strains-for-beginner-growers","Top 7 Easiest Photoperiod Cannabis Strains for Beginner Growers","2025-10-29",{"featured_image":503,"url":512,"title":513,"updated_at":514},{"id":36,"alt":504,"path":36,"large":509,"original":510,"user_context":511},{"au":505,"ca":505,"de":506,"en":505,"fr":507,"nl":508,"nz":505,"uk":505,"us":505},"9 Best Sativa Strains for Daytime Energy, Focus & Creativity","9 Beste Sativa-Sorten für Energie, Fokus & Kreativität am Tag","9 Meilleures Variétés Sativa pour Énergie, Focus & Créativité","9 Beste Sativa Strains voor Energie, Focus & Creativiteit overdag","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Ftop-8-energizing-sativa-strains-perfect-for-daytime-use-and-creativity.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Ftop-8-energizing-sativa-strains-perfect-for-daytime-use-and-creativity.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fau\u002Fblog\u002Ftop-8-energizing-sativa-strains-perfect-for-daytime-use-and-creativity","Top 8 Energizing Sativa Strains Perfect for Daytime Use and Creativity","2025-10-22",{"title":516,"key":517,"entity":394,"items":518},"Latest Posts","latest_posts",[519,532,545,558,571],{"featured_image":520,"url":529,"title":530,"updated_at":531},{"id":521,"path":522,"original":523,"large":524,"alt":525},"5068",{"original":523,"large":524},"https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fgrow-diary-fat-bastard.webp","https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fgrow-diary-fat-bastard.webp",{"en":526,"de":527,"nl":527,"fr":528,"ca":526,"us":526,"uk":526,"au":526,"nz":526},"Fat Bastard Photoperiod Grow Diary Week by Week","Fat Bastard fotoperiode kweekdagboek week voor week","Journal de culture photopériodique Fat Bastard semaine par semaine","\u002Fau\u002Fblog\u002Ffat-bastard-week-by-week-grow-diary-strain-review","Fat Bastard - Week by Week Grow Diary & Strain Review","2026-09-04",{"featured_image":533,"url":542,"title":543,"updated_at":544},{"id":36,"alt":534,"path":36,"large":539,"original":540,"user_context":541},{"au":535,"ca":535,"de":536,"en":535,"fr":537,"nl":538,"nz":535,"uk":535,"us":535},"A close-up of a person's palm holding a pile of mature cannabis seeds and a small green cannabis leaf, illustrating the starting point of growing home medicine and the importance of choosing between high-THC and high-CBD genetics for specific health goals.","Eine Nahaufnahme der Handfläche einer Person, die einen Haufen reifer Cannabissamen und ein kleines grünes Cannabisblatt hält, und damit den Ausgangspunkt für den Anbau von Hausmedizin sowie die Bedeutung der Wahl zwischen Genetik mit hohem THC- und hohem CBD-Gehalt für bestimmte Gesundheitsziele veranschaulicht.","Un gros plan de la paume d’une personne tenant une poignée de graines de cannabis matures et une petite feuille verte de cannabis, illustrant le point de départ de la culture de son propre médicament à domicile et l’importance de choisir entre des génétiques riches en THC et riches en CBD selon des objectifs de santé spécifiques.","Een close-up van iemands handpalm die een hoop rijpe cannabiszaden en een klein groen cannabisblad vasthoudt, waarmee het startpunt van het kweken van thuismedicatie wordt geïllustreerd en het belang van het kiezen tussen genetica met een hoog THC-gehalte en genetica met een hoog CBD-gehalte voor specifieke gezondheidsdoelen.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fchoosing-cannabis-seeds-thc-cbd-genetics-hero.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fchoosing-cannabis-seeds-thc-cbd-genetics-hero.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fau\u002Fblog\u002Fhigh-cbd-vs-high-thc-genetics-choosing-your-medicine","High-CBD vs. High-THC Genetics: Choosing Your Medicine","2026-08-28",{"featured_image":546,"url":555,"title":556,"updated_at":557},{"id":36,"alt":547,"path":36,"large":552,"original":553,"user_context":554},{"au":548,"ca":548,"de":549,"en":548,"fr":550,"nl":551,"nz":548,"uk":548,"us":548},"A high-end flat-lay photography shot on marble featuring a cannabis fan leaf, a blue spray bottle of colloidal silver, a pile of mature seeds, and a small glass of dried buds.","Eine hochwertige Flat-Lay-Fotografieaufnahme auf Marmor mit einem Cannabis-Fächerblatt, einer blauen Sprühflasche mit kolloidalem Silber, einem Haufen reifer Samen und einem kleinen Glas mit getrockneten Blüten.","Une photographie flat lay haut de gamme prise sur du marbre, présentant une feuille de cannabis, un flacon pulvérisateur bleu d’argent colloïdal, un tas de graines mûres et un petit verre de têtes séchées.","Een luxe flat-layfoto op marmer met een cannabiswaaierblad, een blauwe spuitfles met colloïdaal zilver, een hoopje rijpe zaden en een klein glaasje met gedroogde toppen.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fhow-to-make-feminized-cannabis-seeds-guide.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fhow-to-make-feminized-cannabis-seeds-guide.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fau\u002Fblog\u002Fhow-to-make-feminised-seeds-at-home","How to Make Your Own feminised Seeds at Home","2026-08-21",{"featured_image":559,"url":568,"title":569,"updated_at":570},{"id":36,"alt":560,"path":36,"large":565,"original":566,"user_context":567},{"au":561,"ca":561,"de":562,"en":561,"fr":563,"nl":564,"nz":561,"uk":561,"us":561},"A stunning, hyper-detailed close-up of a purple cannabis flower covered in white frosty trichomes and bright orange hairs, representing high terpene content.","Eine atemberaubende, hyperdetaillierte Nahaufnahme einer violetten Cannabisblüte, bedeckt mit weißen, frostigen Trichomen und leuchtend orangefarbenen Härchen, die einen hohen Terpengehalt darstellt.","Un gros plan époustouflant et hyper détaillé d’une fleur de cannabis violette recouverte de trichomes blancs givrés et de poils orange vif, représentant une forte teneur en terpènes.","Een verbluffende, hypergedetailleerde close-up van een paarse cannabisbloem bedekt met witte, rijpachtige trichomen en feloranje haren, die een hoog terpeengehalte vertegenwoordigt.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Ftrichome-covered-potency.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Ftrichome-covered-potency.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fau\u002Fblog\u002Fterpenes-explained-how-to-grow-the-best-tasting-strains","Terpenes Explained: How to Grow the Best Tasting Strains","2026-08-17",{"featured_image":572,"url":581,"title":582,"updated_at":583},{"id":36,"alt":573,"path":36,"large":578,"original":579,"user_context":580},{"au":574,"ca":574,"de":575,"en":574,"fr":576,"nl":577,"nz":574,"uk":574,"us":574},"Three glass seed vials sitting on a desk next to a dried cannabis flower and a magnifying glass, illustrating the journey of cannabis genetics.","Drei gläserne Saatgutfläschchen liegen auf einem Schreibtisch neben einer getrockneten Cannabisblüte und einer Lupe und veranschaulichen die Reise der Cannabisgenetik.","Trois fioles en verre contenant des graines, posées sur un bureau à côté d’une fleur de cannabis séchée et d’une loupe, illustrant le parcours de la génétique du cannabis.","Drie glazen zaadvials die op een bureau staan naast een gedroogde cannabisbloem en een vergrootglas, en die de reis van cannabisgenetica illustreren.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fcannabis-breeding-genetics-f1-f2-hero.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fcannabis-breeding-genetics-f1-f2-hero.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fau\u002Fblog\u002Funderstanding-f1-f2-polyhybrid-cannabis-seeds","Understanding F1, F2, and Polyhybrid Cannabis Seeds","2026-08-14",{"head":585,"entity":625},{"meta_title":586,"meta_description":587,"meta_related_url":588,"canonical":589,"alternatives":590},"Is 12\u002F12 Really Best For Cannabis Flowering? New Study Reveals - WSE Australia","A new 2023 study questions the 12\u002F12 lighting rule for cannabis. Discover if longer light hours can boost yield and quality in your indoor grow.",[],"https:\u002F\u002Fweedseedsexpress.com\u002Fau\u002Fblog\u002F12-hours-darkness-the-best-way-to-trigger-flowering",[591,594,598,603,608,612,616,620,621],{"url":592,"iso":10,"locale":10,"domain":593},"https:\u002F\u002Fweedseedsexpress.com\u002Fblog\u002F12-hours-darkness-the-best-way-to-trigger-flowering","https:\u002F\u002Fweedseedsexpress.com",{"url":595,"iso":596,"locale":597,"domain":593},"https:\u002F\u002Fweedseedsexpress.com\u002Fde\u002Fblog\u002F12-stunden-dunkelheit-der-beste-weg-um-die-blute-einzuleiten","de","de-DE",{"url":599,"iso":600,"locale":601,"domain":602},"https:\u002F\u002Fweedseedsexpress.nl\u002Fblog\u002F12-uur-duisternis-de-beste-manier-om-de-bloei-te-starten","nl","nl-NL","https:\u002F\u002Fweedseedsexpress.nl",{"url":604,"iso":605,"locale":606,"domain":607},"https:\u002F\u002Fweedseedsexpress.fr\u002Fblog\u002F12-heures-dobscurite-la-meilleure-facon-de-declencher-la-floraison","fr","fr-FR","https:\u002F\u002Fweedseedsexpress.fr",{"url":609,"iso":610,"locale":611,"domain":593},"https:\u002F\u002Fweedseedsexpress.com\u002Fca\u002Fblog\u002F12-hours-darkness-the-best-way-to-trigger-flowering","ca","en-CA",{"url":613,"iso":614,"locale":615,"domain":593},"https:\u002F\u002Fweedseedsexpress.com\u002Fus\u002Fblog\u002F12-hours-darkness-the-best-way-to-trigger-flowering","us","en-US",{"url":617,"iso":618,"locale":619,"domain":593},"https:\u002F\u002Fweedseedsexpress.com\u002Fuk\u002Fblog\u002F12-hours-darkness-the-best-way-to-trigger-flowering","uk","en-GB",{"url":589,"iso":7,"locale":11,"domain":593},{"url":622,"iso":623,"locale":624,"domain":593},"https:\u002F\u002Fweedseedsexpress.com\u002Fnz\u002Fblog\u002F12-hours-darkness-the-best-way-to-trigger-flowering","nz","en-NZ",{"type":394,"data":626},{"id":627,"canonical":10,"url":628,"title":629,"description":630,"clone":631,"indexed":634,"featured_image":635,"meta_title":645,"meta_description":587,"meta_keywords":36,"reading_time":177,"created_at":646,"updated_at":646,"defaultCategory":647,"categories":655,"relatedPosts":656,"author":657,"pillar_categories_posts":672},435,"\u002Fau\u002Fblog\u002F12-hours-darkness-the-best-way-to-trigger-flowering","Is 12 Hours of Darkness Really the Best Way to Trigger Flowering in Cannabis?","\u003Cp>Every indoor grower has heard it a thousand times: \u003Cem>flip to 12\u002F12 to flower for \u003Ca href=\"\u002Fau\u002Fcollections\u002Fphotoperiod-seeds\">photoperiod strains\u003C\u002Fa>.\u003C\u002Fem> But what if that long-held rule, twelve hours of light followed by twelve of darkness, isn’t quite the sweet spot we think it is?\u003C\u002Fp>\n\u003Cp>We have another fascinating piece of research to share this week. A 2023 study from the University of Guelph asked the question head-on: \u003Cstrong>Is twelve hours really the optimum photoperiod for promoting flowering in indoor cannabis?\u003C\u002Fstrong> Here’s what the researchers found, and what it means for anyone growing under LEDs today.\u003C\u002Fp>\n\u003Ch2>Background: The 12\u002F12 Tradition\u003C\u002Fh2>\n\u003Cp>When cannabis cultivation moved indoors, the 12-hour dark cycle became gospel. The reasoning was simple: most drug-type \u003Cem>C. sativa\u003C\u002Fem> strains behave as short-day plants. Once day length drops below a critical threshold, they stop vegetative growth and begin flowering.\u003C\u002Fp>\n\u003Cp>Twelve hours of light became the industry standard because it was easy to program, it reliably triggered flowering across most genetics, and it allowed multiple cultivars to share the same room without light-response conflicts.\u003C\u002Fp>\n\u003Cp>But that convention was never rigorously tested on modern indoor hybrids. Today’s genetics often combine high-latitude and equatorial lineages, producing a spectrum of photoperiod sensitivities, from strict short-day cultivars to semi-autoflowering phenotypes. It’s entirely possible that some strains could handle (or even prefer) a longer day length, benefiting from more photosynthetic light before the lights go out.\u003C\u002Fp>\n\u003Ch2>The Experiment\u003C\u002Fh2>\n\u003Cp>Researchers Ashleigh Ahrens, David Llewellyn, and Youbin Zheng grew ten popular THC-dominant cultivars, each with typical potency above 19% THC, in a controlled-environment growth chamber.\u003C\u002Fp>\n\u003Cp>The lineup included well-known varieties such as \u003Cstrong>Blue Dream\u003C\u002Fstrong>, \u003Cstrong>Gorilla Glue\u003C\u002Fstrong>, \u003Cstrong>OG Kush\u003C\u002Fstrong>, and \u003Cstrong>Ghost Train Haze\u003C\u002Fstrong>, spanning the full indica–sativa spectrum.\u003C\u002Fp>\n\u003Cp>They exposed clones of each cultivar to \u003Cstrong>six different photoperiods\u003C\u002Fstrong> over a 24-hour cycle:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>12 h light\u003C\u002Fli>\n\u003Cli>12.5 h\u003C\u002Fli>\n\u003Cli>13 h\u003C\u002Fli>\n\u003Cli>13.5 h\u003C\u002Fli>\n\u003Cli>14 h\u003C\u002Fli>\n\u003Cli>15 h\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Light intensity averaged \u003Cstrong>≈ 360 µmol m⁻² s⁻¹\u003C\u002Fstrong> from full-spectrum white LEDs, with careful shielding to eliminate stray light (less than 0.05 µmol m⁻² s⁻¹ at canopy level).\u003C\u002Fp>\n\u003Cp>The plants grew for \u003Cstrong>3–4 weeks\u003C\u002Fstrong> under these schedules. Researchers tracked:\u003C\u002Fp>\n\u003Col>\n\u003Cli>\u003Cstrong>Elapsed Days to Flowering (EDTF)\u003C\u002Fstrong> – the time until each plant produced at least three pairs of stigmas on the primary shoot.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Inflorescence Metrics\u003C\u002Fstrong> – fresh weight, volume, and total floral biomass.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Harvest Index (HI)\u003C\u002Fstrong> – the proportion of total above-ground mass allocated to flowers versus vegetative tissue.\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Ch2>What Happened When Light Hours Increased\u003C\u002Fh2>\n\u003Ch3>1. Flowering Still Happened, Up to a Point\u003C\u002Fh3>\n\u003Cp>All ten cultivars successfully initiated flowering under photoperiods up to \u003Cstrong>14 hours\u003C\u002Fstrong>. In some cases, flowering was slightly delayed, by \u003Cem>zero to four days\u003C\u002Fem> compared to the 12-hour control, but not halted.\u003C\u002Fp>\n\u003Cp>A few cultivars even began to flower under \u003Cstrong>15 hours\u003C\u002Fstrong>, but their floral tissues never progressed beyond initiation; stigmas appeared, then stalled. In other words, they entered the “idea” of flowering but never developed marketable buds.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Takeaway:\u003C\u002Fstrong> 14 hours still worked for nearly every strain tested; 15 hours was too long.\u003C\u002Fp>\n\u003Ch3>2. Longer Days Didn’t Ruin Flowering, but Yields Varied\u003C\u002Fh3>\n\u003Cp>When researchers compared flower weights and volumes, patterns differed by cultivar:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Blue Dream\u003C\u002Fstrong>, \u003Cstrong>Black Triangle\u003C\u002Fstrong>, and \u003Cstrong>Powdered Donuts\u003C\u002Fstrong> showed \u003Cem>quadratic\u003C\u002Fem> responses, meaning their best yields occurred around \u003Cstrong>12.6 – 13 hours\u003C\u002Fstrong> of light.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Chem de la Chem\u003C\u002Fstrong>, \u003Cstrong>Legendary Larry\u003C\u002Fstrong>, and \u003Cstrong>OG Kush\u003C\u002Fstrong> performed best at the traditional 12 hours, declining steadily beyond that.\u003C\u002Fli>\n\u003Cli>Others, like \u003Cstrong>Ghost Train Haze\u003C\u002Fstrong> and \u003Cstrong>Gorilla Glue\u003C\u002Fstrong>, showed no significant difference up to 14 hours.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The data suggest that for some genetics, stretching the day by even half an hour can slightly boost early floral biomass, likely because of the higher \u003Cstrong>Daily Light Integral (DLI)\u003C\u002Fstrong>, the total light received per day.\u003C\u002Fp>\n\u003Ch3>3. The Harvest Index Told the Real Story\u003C\u002Fh3>\n\u003Cp>The Harvest Index (floral FW \u002F total FW) revealed how each plant allocated energy between vegetative growth and flower formation.\u003C\u002Fp>\n\u003Cp>Five cultivars reached their maximum HI between \u003Cstrong>11.8 h and 12.9 h\u003C\u002Fstrong>, reinforcing that the “sweet spot” hovers close to 12 hours for most strains. Yet others maintained respectable floral ratios up to 13.5 h.\u003C\u002Fp>\n\u003Cp>That nuance matters for commercial growers. A small extension in light hours could increase overall biomass (thanks to more DLI) without dramatically slowing floral development, provided your cultivar tolerates it.\u003C\u002Fp>\n\u003Ch2>Why It Matters: DLI, Energy, and Economics\u003C\u002Fh2>\n\u003Cp>For indoor cultivators paying by the kilowatt, light-hour decisions have real cost implications.\u003C\u002Fp>\n\u003Cp>Every additional hour of light adds roughly \u003Cstrong>8% more DLI\u003C\u002Fstrong> (and power cost) per hour. A 13-hour schedule yields ≈ 8% more light; 14 hours, about 17%. If that extra light meaningfully increases yield or potency, it might justify the energy expense. If it only produces more leaves, it’s wasted electricity.\u003C\u002Fp>\n\u003Cp>This study hints that \u003Cem>some\u003C\u002Fem> strains could harness that extra energy efficiently, particularly those with sativa heritage, while others simply elongate vegetatively without proportionate bud gain.\u003C\u002Fp>\n\u003Cp>In short: longer days = more photons = potentially more yield, but only if your genetics can translate light into flowers rather than stems.\u003C\u002Fp>\n\u003Ch2>Context from Other Research\u003C\u002Fh2>\n\u003Cp>The Guelph team’s results align with several recent studies:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Peterswald et al. (2023)\u003C\u002Fstrong> found that medicinal cannabis grown under \u003Cstrong>14 h\u003C\u002Fstrong> of light achieved \u003Cstrong>≈ 30% higher floral yield\u003C\u002Fstrong> than at 12 h, largely due to increased DLI.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Zhang et al. (2021)\u003C\u002Fstrong> observed minimal delay in flowering for hemp cultivars up to 13.5 h, with 1–2-day delays at 14 h.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Moher et al. (2021)\u003C\u002Fstrong> reported similar initiation timing between 12 h and 13.2 h in tissue-culture plants.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Taken together, these studies challenge the one-size-fits-all 12\u002F12 formula. Flower initiation appears flexible in many modern hybrids, especially those bred from mixed geographic lineages.\u003C\u002Fp>\n\u003Ch2>Limitations to Keep in Mind\u003C\u002Fh2>\n\u003Cp>The trial lasted only \u003Cstrong>three to four weeks\u003C\u002Fstrong>, roughly the first third of a normal flowering cycle. The team stopped before full maturity, so we can’t say whether the modest early gains under longer light hours translate into heavier final yields or richer cannabinoid profiles.\u003C\u002Fp>\n\u003Cp>Also, plants were grown at high density with moderate light (≈ 360 µmol m⁻² s⁻¹), far below commercial PPFD levels of 800–1000. Under stronger light, photoperiod effects might differ.\u003C\u002Fp>\n\u003Cp>Still, the data establish that \u003Cstrong>flowering initiation\u003C\u002Fstrong>, the crucial flip point, can occur at day lengths up to 14 hours for many cultivars without catastrophic delay.\u003C\u002Fp>\n\u003Ch2>Practical Takeaways for Growers\u003C\u002Fh2>\n\u003Ch3>1. Know Your Genetics\u003C\u002Fh3>\n\u003Cp>Photoperiod response is cultivar-specific. Indica-dominant lines such as ‘Chem de la Chem’ and ‘Legendary Larry’ stuck closely to 12 hours, while sativa-leaning cultivars like ‘Blue Dream’ tolerated longer days. If you run multiple strains in one room, the conservative 12\u002F12 remains safest.\u003C\u002Fp>\n\u003Ch3>2. Experiment Cautiously with 12.5 – 13.5 Hours\u003C\u002Fh3>\n\u003Cp>If you’re growing a single cultivar and can track development precisely, try extending the light period by 30–90 minutes. Watch for:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Delays in pistil formation\u003C\u002Fli>\n\u003Cli>Excessive vegetative stretching\u003C\u002Fli>\n\u003Cli>Slower trichome development\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>If flowering stays on schedule and buds form normally, the extra light may improve biomass and cannabinoid yield.\u003C\u002Fp>\n\u003Ch3>3. Mind the Energy Curve\u003C\u002Fh3>\n\u003Cp>Adding one hour of light increases both potential yield and electricity use by ≈ 8%. Compare grams per kilowatt-hour, not just grams per plant, to decide whether the longer day pays off.\u003C\u002Fp>\n\u003Ch3>4. Avoid 15 Hours Unless You’re Testing\u003C\u002Fh3>\n\u003Cp>At 15 h, flowering stalled entirely in most cultivars. Those plants produced stigmas but no developing buds, essentially wasting energy and time.\u003C\u002Fp>\n\u003Ch2>The Bigger Picture: Rethinking the “Flip”\u003C\u002Fh2>\n\u003Cp>For decades, the 12\u002F12 schedule has been treated as biological law. This study reminds us it’s really \u003Cem>an industry convention\u003C\u002Fem>, not a universal constant. Cannabis evolved across latitudes, from equatorial day-neutral landraces to Himalayan short-day indica, and modern hybrids carry bits of both worlds.\u003C\u002Fp>\n\u003Cp>A cultivar’s “critical photoperiod” may vary anywhere from 12 to 14 hours. Understanding where each strain sits on that curve allows growers to fine-tune DLI, potentially increasing yield without extending total production time.\u003C\u002Fp>\n\u003Cp>As lighting technology advances and sensors make precision control affordable, photoperiod could become another optimization lever, right beside PPFD, CO₂, and nutrient management.\u003C\u002Fp>\n\u003Ch2>Conclusion: 12 Hours Is Reliable, Not Sacred\u003C\u002Fh2>\n\u003Cp>Ahrens et al. (2023) concluded that many indoor cannabis cultivars are capable of initiating flowering under day lengths up to \u003Cstrong>14 hours\u003C\u002Fstrong>, though inflorescence size and early floral yield tended to decline beyond \u003Cstrong>13 hours\u003C\u002Fstrong>. Future studies should follow crops through full maturity and analyze cannabinoid content under different light schedules.\u003C\u002Fp>\n\u003Cp>For now, the takeaway is straightforward:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>12 hours\u003C\u002Fstrong> = the most consistent trigger.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>12.5 – 13 hours\u003C\u002Fstrong> = a promising frontier for light-efficient yield gains.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>14 hours\u003C\u002Fstrong> = risky but workable for some sativas.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>15 hours\u003C\u002Fstrong> = too long; flowering stalls.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>If you’re running LEDs in a tightly controlled room, small photoperiod tweaks could become one of the simplest ways to squeeze more value from each watt.\u003C\u002Fp>\n\u003Cp>So the next time someone insists that 12\u002F12 is the only way, you can point to the data, and remind them that in cannabis, as in science, \u003Cem>rules of thumb are made to be tested.\u003C\u002Fem>\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Citation:\u003C\u002Fstrong>\u003Cbr>Ahrens, A., Llewellyn, D., & Zheng, Y. (2023). \u003Ca href=\"https:\u002F\u002Fwww.mdpi.com\u002F2223-7747\u002F12\u002F14\u002F2605\">\u003Cem>Is Twelve Hours Really the Optimum Photoperiod for Promoting Flowering in Indoor-Grown Cultivars of Cannabis sativa?\u003C\u002Fem>\u003C\u002Fa> \u003Cem>Plants\u003C\u002Fem>, 12(14), 2605. \u003C\u002Fp>",{"au":632,"ca":632,"de":633,"en":633,"fr":633,"nl":633,"nz":632,"uk":632,"us":632},"enabled","disabled","index",{"id":36,"alt":636,"path":36,"large":642,"original":643,"user_context":644},{"au":637,"ca":637,"de":638,"en":639,"fr":640,"nl":641,"nz":637,"uk":637,"us":637},"Is 12 Hours of Darkness Really the Best Way to Trigger Flowering in Cannabis","Ist 12 Stunden Dunkelheit wirklich die beste Methode, um die Blüte bei Cannabis auszulösen?","12 Hours of Darkness the Best Way to Trigger Flowering in Cannabis","Les 12 heures d’obscurité sont-elles vraiment la meilleure façon de déclencher la floraison du cannabis ?","Zijn 12 uur duisternis echt de beste manier om de bloei bij cannabis te stimuleren?","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002F12-hours-darkness-the-best-way-to-trigger-flowering.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002F12-hours-darkness-the-best-way-to-trigger-flowering.webp",{"user_url":36,"user_name":36,"user_image":62},"Is 12\u002F12 Really Best for Cannabis Flowering? New Study Reveals","2025-11-06",{"id":648,"url":332,"title":331,"description":649,"slug":650,"icon":320,"lang_status":632,"status":632,"meta_title":651,"meta_description":652,"meta_keywords":36,"created_at":653,"updated_at":654},9,"\u003Ch1>Informational\u003C\u002Fh1>\n\u003Cp>Explore detailed articles with general information on cannabis, including its history, uses, cultivation science, and industry trends.\u003C\u002Fp>","informational","Informational Cannabis Blogs","Dive into the world of cannabis with informational blogs on its history, uses, science, and industry trends at WeedSeedsExpress.","2024-07-16","2025-01-20",[],[],{"id":168,"url":658,"title":659,"first_name":660,"last_name":661,"slug":662,"email":663,"description":664,"socials":665,"resume":666,"featured_image":667},"\u002Fau\u002Fauthors\u002Fjane","Cannabis Blogger and Cultivar","Jane","Freeman","jane","jane@weedseedsexpress.com","\u003Cp>Passionate and results-driven cannabis cultivator with over 10 years of hands-on growing experience in Southern California. Skilled in greenhouse and indoor production, strain selection, pest management, and sustainable cultivation practices. Dedicated educator and content creator, known for translating complex horticultural concepts into clear, actionable insights for both novice and experienced growers.\u003C\u002Fp>",{"x":30,"linkedin":30,"instagram":30},"\u003Cp>Jane Freeman is a San Diego-based cannabis cultivator with a decade of experience. \u003C\u002Fp>",{"large":668,"small":669,"medium":670,"original":671},"https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Flarge\u002Fjane-freeman.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Fsmall\u002Fjane-freeman.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Fmedium\u002Fjane-freeman.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Foriginal\u002Fjane-freeman.webp",[673,685,691,706],{"id":674,"url":675,"title":676,"short_description":677,"featured_image":678,"reading_time":168,"default_category_title":323,"created_at":684,"updated_at":684},427,"\u002Fau\u002Fblog\u002Ftips-for-transitioning-photoperiod-cannabis-plants","5 Key Tips for Transitioning Photoperiod Cannabis Plants from Veg to Flower","Every grower remembers their first flip. That moment when you decide your plants are ready to leave the comfort of long ",{"id":36,"alt":679,"path":36,"large":681,"original":682,"user_context":683},{"au":680,"ca":680,"de":680,"en":680,"fr":680,"nl":680,"nz":680,"uk":680,"us":680},"Tip for transition photoperiod cannabis plants from veg to flower","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002F5-key-tips-for-transitioning-photoperiod-cannabis-plants.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002F5-key-tips-for-transitioning-photoperiod-cannabis-plants.webp",{"user_url":36,"user_name":36,"user_image":62},"2025-11-12",{"id":686,"url":499,"title":500,"short_description":687,"featured_image":688,"reading_time":168,"default_category_title":327,"created_at":501,"updated_at":501},426,"Autoflowers often steal the spotlight for simplicity, but don’t sleep on photoperiod strains.\nWith a little attent",{"id":36,"alt":689,"path":36,"large":496,"original":497,"user_context":690},{"au":492,"ca":492,"de":493,"en":492,"fr":494,"nl":495,"nz":492,"uk":492,"us":492},{"user_url":36,"user_name":36,"user_image":62},{"id":692,"url":693,"title":694,"short_description":695,"featured_image":696,"reading_time":182,"default_category_title":334,"created_at":705,"updated_at":705},425,"\u002Fau\u002Fblog\u002Fbest-photoperiod-cannabis-strains-for-short-growing-seasons","Best Photoperiod Cannabis Strains for Short Growing Seasons","If your outdoor season feels like a sprint , late frosts in spring, early frosts in fall , you’re not alone. Up he",{"id":36,"alt":697,"path":36,"large":702,"original":703,"user_context":704},{"au":698,"ca":698,"de":699,"en":698,"fr":700,"nl":701,"nz":698,"uk":698,"us":698},"Fast-Flowering Photoperiod Strains for Short Outdoor Seasons","Schnell blühende Photoperioden-Sorten für kurze Outdoorsaisons","Variétés photopériode à floraison rapide pour les saisons extérieures courtes","Snelbloeiende fotoperiode strains voor korte buitenseizoenen","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fbest-photoperiod-cannabis-strains-for-short-growing-seasons.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fbest-photoperiod-cannabis-strains-for-short-growing-seasons.webp",{"user_url":36,"user_name":36,"user_image":62},"2025-10-24",{"id":707,"url":708,"title":709,"short_description":710,"featured_image":711,"reading_time":168,"default_category_title":331,"created_at":720,"updated_at":720},428,"\u002Fau\u002Fblog\u002Fphotoperiod-cannabis-seeds-explained-how-light-cycles-control-your-harvest","Photoperiod Cannabis Seeds Explained: How Light Cycles Control Your Harvest","If you've ever wondered why your cannabis plants suddenly go from growing leaves to dense, resin-filled buds, it's becau",{"id":36,"alt":712,"path":36,"large":717,"original":718,"user_context":719},{"au":713,"ca":713,"de":714,"en":713,"fr":715,"nl":716,"nz":713,"uk":713,"us":713},"Photoperiod Cannabis Seeds Explained: Light Cycles, Timing & Grower Tips","Photoperiodische Cannabissamen erklärt: Lichtzyklen, Timing & Grower-Tipps","Graines de cannabis photopériodiques expliquées : cycles lumineux, timing & conseils de culture","Fotoperiode-cannabiszaden uitgelegd: Lichtcycli, timing & kweektips","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fphotoperiod-cannabis-seeds-explained-how-light-cycles-control-your-harvest.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fphotoperiod-cannabis-seeds-explained-how-light-cycles-control-your-harvest.webp",{"user_url":36,"user_name":36,"user_image":62},"2025-10-08",1788775607220]