The objective of the present work was to study the possible allelopathic effect of aqueous extract of Artemisia absinthium on the germination of cucumber, corn, bean and tomato seeds, used as indicators. Extracts were prepared from either shoot, root or a mixture of root + shoot. Aqueous extracts were prepared separately, in a ratio 5ml of water per 1g of plant material, filtered, centrifuged, and the upper transparent liquid was used. Petri dishes with 10 seeds were filled with 10ml of aqueous extracts for cucumber, 15ml for corn and bean and 5ml for tomato. The control consisted of water for each seed type and the research was carried out at room temperature (summer). Moreover, to test the temperature sensitivity of the extracts, the same treatments were used after boiling for five seconds. The results showed that the different extracts from Artemisia absinthium inhibited tomato and cucumber seeds for germination, but with bean and corn the inhibition was too little. It was concluded that there is an allelopathic action of substances from Artemisia absinthium on cucumber and tomato seed germination and temperature not affected this extracts.