Fig 3. Seasonal photoperiod and averaged light quantity measured in A) 2016 and B) 2017.

At each measurement date, single photoperiod values were extracted from the nearest weather station, while five measurements of light quantity were taken per plot (n¹ = 10). For graphical representation of light quantity, data were grouped by plot and date and averaged into single, weekly values for each plot. Boxplots represent the minimum, first quartile, median, mean (◇), third quartile, and maximum calculated on the weekly averages across plots. Dashed vertical lines highlight bud type transition, the time at which chasmogamous budding ceased and the first cleistogamous buds were observed.