Comparison of various concentrations of aqueous extracts prepared from roots, stems and leaves of G. hirsutum on the seedlings of T. aestivum. (a) germination percentage, (b) germination energy, (c) germination rate index, (d) mean germination time, (e) seed vigor index, (f) coefficient of velocity of germination, (g) average accumulative root growth. *P < 0.05, t-test suggesting that the given variable (root/stem/leaf) in the test treatment is significantly different compared to the rest of the variables, **P < 0.05, Dunnett’s test relative to control treatment (i.e. Control).