Experimental dataset on the effects of end-of-day and continuous far-red on vegetative and flower induction in Cannabis sativa

This dataset presents experimental data derived during an experiment to evaluate the effects of end-of-day (EOD) and continuous far-red (FR) light on vegetative growth and flower induction in Cannabis sativa L. under controlled environment conditions. The experiment compared three lighting strategies, a red-blue spectrum (RB) as control, red and blue plus continuous far-red supplementation, and red-blue with far-red applied only during the final hour of the light period—during the transition from vegetative to reproductive stages. The dataset documents morphological, physiological, and phenological responses of 36 plants, including canopy development, fresh and dry biomass, multispectral reflectance indices, energy parameters, and flowering progression. Results show that both EOD and continuous FR promoted greater canopy elongation compared to RB, with a shift in biomass allocation favoring leaf development. Far-red treatments also enhanced chlorophyll accumulation, indicating improved photosynthetic efficiency, while flower induction timing remained unaffected across treatments. Overall, this dataset provides a comprehensive quantitative foundation to assess how light spectrum modulation—particularly the timing of far-red exposure—shapes plant architecture and physiological performance in Cannabis sativa.