Screen house studies were carried out under controlled conditions during the rainy seasons of 2006 and 2007 at CCS Haryana Agricultural University, Hisar to evaluate the influence of seeding depth and flooding duration on the emergence of Ammania baccifera, Cyperus alutatus, C. arenarius, C. difformis, C. iria and Scirpus roylei. Seeding depths of 0, 0.5, 1, 2 and 4 cm and flooding durations of 0, 4, 8, 16, 32 and 64 days were maintained with four replicated pots. Maximum emergence was recorded from 0.5 cm and surface (0 cm) which decreased by 44 and 80% at 1 and 2 cm depths compared to 0.5 cm depth and no emergence was recorded from 4 cm or higher depths, data averaged over species. Emergence of S. roylei was 80% at 0.5 cm and decreased by 9 and 46% at 1 and 2 cm depths, whereas 63% lower emergence was recorded from 0 cm depth, respectively. Emergence of A. baccifera, C. difformis and C. iria was similar from 0 and 0.5 cm but decreased significantly with increasing depths, whereas C. arenarius and C. alutatus recorded 20 and 10% lower emergence, respectively, from 0.5 cm compared to surface placed seeds and no emergence was recorded from 2 cm depth. However, 43, 27 and 15% emergence was recorded for S. roylei, A. baccifera and C. iria from 2 cm depth, respectively. Flooding caused significant reduction in the emergence of C. arenarius and C. alutatus, but had no adverse effect on S. roylei. Flooding encouraged emergence of C. difformis and C. iria as higher emergence was observed with increasing flooding period from 0 to 16 days (d), whereas 16 d flooding caused 100% reduction in the emergence of C. arenarius. Conversely, S. roylei emergence inhibited without flooding and flooding duration of 16 d or more resulted in >90% emergence. Increased flooding duration was positively correlated with the emergence and growth of all species except C. arenarius and C. alutatus. A flooding duration of 64 d reduced emergence of C. difformis and C. iria, but still it was similar to no flooding and their growth was more compared to lower flooding durations. Similarly, A. baccifera emergence was 18% lower with 64 d flooding compared to no flooding, but had no adverse effect on plant growth and no inhibition in emergence was observed in S. roylei with 64 d flooding. The results indicate susceptibility of C. arenarius and to a lower extent of C. alutatus to flooding, but emergence and growth of other Cyperus spp., S. roylei and A. baccifera was stimulated by water. The test species behaved differently to moisture levels and seeding depths and this information can be used under different conditions using tillage operations and water management for lowering their menace.