The allelopathic effects of Thymus kotschamus plant parts on germination and early growth of A. millforlium was compared under laboratory and pot house conditions. Seeds germination was stimulated by 0.1%KNO3. Seed germination and growth was monitored daily for germination (%), rate of germination, mean germination time and germination inhibition. The root and stem portions were studied to determine the effect of T. kotschyanus on plant vigour. The data obtained was subjected to Duncan’s test. The results showed that thymus plant parts had concentration dependant negative effects on seed germination and seedling growth of A. millefolium.