The Optimal Cannabis Flower Photoperiod: It’s not 12/12….
May 26 2023 – Danielle Daly

Flower photoperiod research. Could 14 on + 10 off for 28 days…then 12/12 the last 28 days be the new flower standard?
According to this study the results are an increase in yield and similar thc %. Net gain in total thc yield. One study is not conclusive - but it was well done and does make sense. 14 on /10 off (for the duration of flowering) showed the most yield gains but largest thc % drop.
𝐓𝐡𝐞 𝐬𝐭𝐮𝐝𝐲
The three varieties used in the study were: 'Cannatonic,' a high CBD-accumulating line, as well as 'Northern Lights' and 'Hindu Kush,' two high THC varieties.
𝐑𝐞𝐬𝐮𝐥𝐭𝐬
The results showed differences between the three varieties in their response to different light treatments, with some significant yield increases in response to 14L. "Most significantly, the high-CBD line (Cannatonic) showed cannabinoid yield increased to more than double when an early 14L photoperiod was applied compared to the standard 12L. In contrast, one of the two high-THC lines tested (Northern Lights) only showed a 50% yield increase in the 14L < 12L treatment, whereas the second high-THC line tested (Hindu Kush) did not show any significant yield effects."
"In particular, cannabinoid yields can be more than doubled by increasing the photoperiod during the flowering phase from 12 h to 14 h, as demonstrated by the Cannatonic line. A 14L > 10L photoperiod also achieved a strong yield benefit which utilizes the same number of light hours as 12L and therefore incurs no extra electricity costs. 𝐅𝐨𝐫 𝐨𝐧𝐞 𝐡𝐢𝐠𝐡-𝐓𝐇𝐂 𝐥𝐢𝐧𝐞, 𝐚 𝟏𝟒𝐋 > 𝟏𝟐𝐋 𝐩𝐡𝐨𝐭𝐨𝐩𝐞𝐫𝐢𝐨𝐝 𝐢𝐧𝐜𝐫𝐞𝐚𝐬𝐞𝐝 𝐓𝐇𝐂 𝐲𝐢𝐞𝐥𝐝𝐬 𝐛𝐲 𝟒𝟗%, 𝐝𝐫𝐢𝐯𝐞𝐧 𝐛𝐲 𝐚 𝐠𝐚𝐢𝐧 𝐢𝐧 𝐛𝐢𝐨𝐦𝐚𝐬𝐬 𝐨𝐧𝐥𝐲 (𝐧𝐨 𝐜𝐡𝐚𝐧𝐠𝐞 𝐢𝐧 % 𝐓𝐇𝐂), 𝐰𝐡𝐞𝐫𝐞𝐚𝐬 𝐚 𝐬𝐞𝐜𝐨𝐧𝐝 𝐡𝐢𝐠𝐡-𝐓𝐇𝐂 𝐥𝐢𝐧𝐞 𝐝𝐢𝐝 𝐧𝐨𝐭 𝐬𝐡𝐨𝐰 𝐚𝐧𝐲 𝐬𝐢𝐠𝐧𝐢𝐟𝐢𝐜𝐚𝐧𝐭 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐜𝐞𝐬. 𝐀𝐬 𝐭𝐡𝐢𝐬 𝐭𝐫𝐞𝐚𝐭𝐦𝐞𝐧𝐭 𝐚𝐥𝐬𝐨 𝐛𝐞𝐧𝐞𝐟𝐢𝐭𝐭𝐞𝐝 𝐂𝐚𝐧𝐧𝐚𝐭𝐨𝐧𝐢𝐜, 𝐭𝐡𝐢𝐬 𝐦𝐚𝐲 𝐛𝐞 𝐭𝐡𝐞 𝐛𝐞𝐬𝐭 '𝐚𝐥𝐥-𝐫𝐨𝐮𝐧𝐝' 𝐭𝐫𝐞𝐚𝐭𝐦𝐞𝐧𝐭 𝐨𝐩𝐭𝐢𝐦𝐚𝐥 𝐟𝐨𝐫 𝐦𝐢𝐱𝐞𝐝 𝐜𝐮𝐥𝐭𝐢𝐯𝐚𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐮𝐧𝐭𝐞𝐬𝐭𝐞𝐝 𝐯𝐚𝐫𝐢𝐞𝐭𝐢𝐞𝐬,"
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