Irradiance treatment during ST 1 did not affect plant height significantly (Table 1). Plant height ranged from 6.5 cm with 30%SH/30% SH/30% SH to 9.9 cm with 30% SH/ND + 14 HID/ND + 14 HID. The length and width of the second and third leaf counted from the distal end of the stem were not affected by irradiance during ST 1,but were affected during ST 2 and ST 3.