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Herbs or medicinal plants are often considered weeds - usually because they grow in undesirable places. Many herbs have been introduced into Australia and because they are not native plants, they have often few competitors for resources such as water, soil nutrients and light and have few predators. Subsequently, these plants can grow and spread unchecked, endangering native vegetation and even various animal species such as birds and insects. Weeds certainly can be a real threat to native flora, fauna, rain forests and even aquatic ecosystems.