Among the M2M2 populations, the control plant (SP 300/ 30.4.2.4) recorded the highest plant height at 60.5 cm compared to50.7cm and 47.4cm for150 Gy and 300 Gy treated plants respectively. Statistically (p ≤ 0.05), treated plants had similar plant heights but different significantly (p < 0.05) from the controls. Therefore re-irradiation of the material produced significant reduction in plant height (Table 1) . 300 Gy treated plants were the earliest to flower after 36 days of sowing compared to 47 and 45 days for 150 Gy and the controls respectively. Statistically (p > 0.05), the controls, 150 Gy and 300 Gy plants had similar days to 50% flowering (Table 1). Irradiation did not produce significant (p > 0.05) differences in flowering between the untreated and the treated material.