Effects of drought on the formation of mycorrhizas byHebeloma crustuliniforme(HC),Paxillus involutus(PI),Laccaria proxima(LP) and Thelephora terrestris (TT) onPicea sitchensiswere studied during well‐watered, moderate and severe drying cycles, and these results were related to the growth and nutrition of the seedlings. TT formed abundant mycorrhizas in all water regimes, Pl showed some preference to the moderately droughted regime, and HC and LP formed most mycorrhizas with the well‐watered seedlings. The differences in the mycorrhizal colonization were not reflected in the growth of plants, but the seedlings with high proportions of mycorrhizas tended to have high N and P concentrations and contents.