The seeds are contained within capsules that produce an average of 14 seeds and as many as 24. Seed germi nation and seedling establishment occur readily in dis turbed sites such as roadsides, fallow ground, and gravel piles. Seeds germinate in early spring with some germina tion in the fall. Flowering occurs from June through Sep tember. Mature seeds remain in capsules until dispersed by physical disturbance.
Vegetative buds are numerous on the crown and primary and secondary roots.
Severed crowns and root sections in fallow fields reestablish following tillage. Greenhouse studies showed that 10 cm sections of roots excavated at 0 to 50cm depths have equal regenerative potential. Likewise, lateral roots and roots from one year old plants produce numerous shoots if they are severed and replanted. In Australia, the tap root of a yellow mignonette plant grew to a depth of 4 m. Yellow mignonette initiates growth from crown and root tissue early in the spring and continues growth late into the fall. Leaves, stems, and seed capsules turn orange red as the plant begins to senesce and when subjected to stress such as drought or herbicide injury.