The effects of aqueous extracts of Artemisia princeps var. orientalis on mycorrhizal fungal colonization and growth of 3 test plants were studied. Root colonization by mycorrhizal fungi on roots of 3 species decreased with increasing aqueous extract concentration. In general, growth of the 3 test plants inoculated with mycorrhigal fungi was inhibited by the aqueous extract and it was concentration-dependent. The growth difference between nonmycorrhizal and mycorrhizal plant was statistically significant.