Antibacterial activity against the two tested Gram-positive bacteria was observed in all extracts with differences of the inhibition zones from a month to another and depending to the concentration (Fig. 2). However, this activity varied against E. coli and P. aeruginosa, with a full attenuation in some periods. The highest inhibitory activity was detected with the extracts collected during April and June, (Fig. 2). The Tables 3 and 4 present diameters of inhibition zones exerted by the methanolic and acetonic extracts and gallic acid used as standard toward tested microorganisms