Figure 4

Flowering time of plants grown outside. Twenty seeds were planted in 20 cm pots and thinned to 15 plants per pot after germination. Three plantings were made on the dates indicated at the top of the figure. For all panels, the number of days is indicated on the x-axis. Vertical pink lines permit comparison across all x-axes. (A-C) The length in days of the vegetative phase is indicated by blue bars. The length of the flowering initiation phase, defined as the period from when the first plant in a pot flowered to the time when the last plant began flowering, is indicated by red bars. The length in days of each phase is indicated by the numbers on the bars. Names of lines are listed in the same order to the left of each graph. (D) Daily maximum and minimum temperatures, in degrees Celsius, recorded at a nearby weather station are indicated by red and green lines, respectively. (E) The blue curve indicates the daily daylength (y-axis) during the 180-day growing period (on the x-axis).