The treatment of infectious diseases is based on compounds intended to inhibit or kill microbial growth. Resistance to antibiotics is a severe problem for public health (Bouyahya et al., 2017). Medicinal and aromatic plants have become an essential part of traditional health systems. Phenolic compounds are secondary metabolites with many biological effects, including antioxidant and antimicrobial properties. Studies have shown that these compounds also inhibit bacterial communication. Biofilm formation, bacteriocin production, conjugation, virulence gene expression, pigment production and bioluminescence formation are believed to be regulated by the intercellular communication mechanism known as quorum sensing (QS) in bacteria (Liu et al., 2017). Many types of bacteria use these intercellular signaling mechanisms for a variety of factors, including bacterial pathogenicity and food degradation. Developing new antibacterial drugs based on QS is an attractive strategy to inhibit bacterial growth (Gopu et al., 2015). Plant secondary metabolites and their semisynthetic derivatives play an important role in anticancer drug treatment (Pan et al., 2010). Crown gall is a neoplastic disease caused by Agrobacterium tumefaciens in plants. The Ti plasmid causes the proliferation of plant cells without passing through apoptosis, and the histology is similar to that of human and animal cancers and the nucleic acid content is similar in tumor formation (Islam et al., 2009). That's why researchers use this microorganisms for controlling antitumor mechanisms (Ramezani et al., 2016). Prunella vulgaris L. (Labiatae) is used in the treatment of sore throat, fever, and wounds in European and Chinese alternative medicine. It is also kown as 'selfheal'. (Rasool et al., 2010). Prunella species contain triterpenoids and their saponins, phenolic acids, sterols, and the associated glycosides, flavonoids, organic acids, volatile oils, and saccharides. The active components related to these functions are mainly triterpenoids, phenolic acids, flavonoids, and polysaccharides (Bai et al., 2016). Pharmacological studies have revealed that Prunella plants possess antibacterial (Mahboubi et al., 2015), antioxidative (Zhang et al., 2011), and antitumor (Hwang et al., 2013) activities. Sambucus nigra, also called elderberry, is a common species that grows in Europe, Asia, North Africa and America (Veberic et al., 2009). Phenolic groups commonly found in elderberry are anthocyanins, flavonol glycosides, hydroxycinnamic acids, and flavonols (Mikulic-Petkovsek et al., 2015). Anthocyanins and other flavonoids (e.g., quercetin) show antioxidant, anticarcinogenic, immunostimulatory, antibacterial, antiallergic, and antiviral activities. Due to these properties, their consumption can contribute to the prevention of several degenerative diseases, such as cardiovascular disease, cancer, inflammatory diseases, and diabetes (Veberic et al., 2009). Several bioactivities of S. nigra have been reported, including antimicrobial (Mohammadsadeghi et al., 2013; Hearts...