Abstract: Summer weeds, Abutilon theophrasti Medik., Amaranthus retroflexus L., Echinochloa colonum (L.) Link., Hibiscus trionum L., Setaria verticillata (L.) P. Beauv., Solanum nigrum L. and Sorghum halepense (L.) Pers. and winter weeds Avena sterilis L. and Sinapis arvensis L., are important weed species in the Cukurova Region of Turkey. In order to detect seed longevity of these weeds, a seed burial experiment was initiated in 1994, except for A. sterilis and S. arvensis, which were buried in 1995. Seeds were recovered 7 years after burial and seed longevity was determined using by germination tests and TTC test. Burial depth, 15 and 30 cm had no significant effect on seed viability. Seed longevity varied among weed species: .A. theophrasti 6.71%; A. retroflexus 0.26%; A. sterilis 0.26%; E. colonum 1.42%; H. trionum 22.74%; S. verticillata 1.66%; S. arvensis 38.18%; S. nigrum 5.38% and S. halepense 8.83% after 7 years.