The allelopathic effect of Artemisia  princeps L. and Launae sonchoids L.  from Taif Governorate, Saudi Arabia  were measured in terms of germination rate and radicel length of a bread wheat variety ‘Ariana’ (Triticum aestivum L.). Diluted extracts of shoot systems were applied to seeds of the test plant. The allelopathy of Artemisia  princeps and Launae sonchoids varied with the concentration and type of species. The concentrated extracts (3.7 5% w/v. and 5% w/v.) were phytotoxic to germination of wheat. The reduction in the germination percentage reached to 15 – 25% and 15 – 30% by treatment with Artemisia  princeps and Launae sonchoids at conc. of  75 and 100% respectively after 8 days. The aqueous extract of Artemisia at 25% caused an increase in the root and shoot growth of the wheat seedlings comparison with that of Launae sonchoids and control. However the growth of root and shoot gradually decreased with increasing extract concentration (50–100%). The biomass production parallel with that of root and shoot lengths were activated at low concentration and inhibited at high ones. The frequency and type of fungal  species varies with different plants. The number of fungal population (CFU) on the rhizosphere of Launae sonchoides was 562 colony/g., while it was 469 colony/g. in the rhizosphere of  Artemisia  princeps. Ten different fungal genera were isolated from the rhizosphere of each of the two plants, the genus Aspergillus was the most frequent followed by Monilia, Rhizoctonia and Rhizopus.

Key wards: Allelopathic,  Artemisia princes,  Launae sonchoids ,  rhizospheric fungi, wheat growth.