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Flowering times of photoperiod‐sensitive hemp cultivars are lower under speed breeding conditions. Nine photoperiod‐sensitive hemp cultivars, as well as the photoperiod‐insensitive hemp cultivar ‘Finola’, were grown under 12 h of light after an initial 14 days of 24 h of light (12). For comparison, the same cultivars were grown in a glasshouse with natural lighting (natural). Flowering times are significantly different between treatments for all cultivars (P < 0.01) except ‘Finola’.
