Cotinus coggygria, Cornus mas and Viburnum lantana are among the most important species in Arasbaran forests in Northwest Iran. This study was carried out to determine which pre-treatments should be used to overcome dormancy of the seeds. Pre-treatments applied to the Cotinus coggygria seeds were submersion in concentrated (98%) sulphuric acid for 5, 10 and 30 minutes and cold stratification for 30, 60 and 90 days. Maximum germination (80%) was observed following submersion in concentrated (98%) sulphuric acid for 90 minutes and then cold stratification for 90 days. Increasing the concentration of exogenous gibberellin to 200 ppm improved germination of Cornus mas seeds to 85%; the effect of cold stratification was limited, with 57.5-60% germination after both 45 and 90 days stratification. Laboratory temperature followed by stratification was applied to Viburnum lantana seeds. The stratification did not significantly affect the germination. Laboratory temperature had a significant effect on breaking seed dormancy and promoted germination up to 70% with no cold treatment.
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