Genetic variably. Two plants have flowered and are forming seed pods while two have just started flowering. Only the two smallest can still be pollinated. The tallest plant reached 17 inches tall, followed by a plant 16 ½ inches tall. The other two plants are 10 and 8 inches tall. All four plant were planted at the same time, and yet have different ages in the life cycle. Genetic variably seems to be the key word with two plants tall and two plants short, two plants are past flowering and two are flowering. These are traits that could be selected for the next generation. If we wanted shorter plants, use only the shorter two plants for cross pollinating. Should we intervene more? This plant has already be selectively bred for speed. In nature, it is the traits that lead to survival that naturally get passed on to the next seed. Could this plant survive outdoors? What would happen if they were planted outside? Would it be the end of them?