The sustainable production systems aim at conservation of both soil and ecological biodiversity. This change in research perspective has changed the view point on weeds, which was focused earlier mainly on eliminating their competition and detrimental effects on crop plants. This opinion article is focused on the positive role of weeds in soil conservation and maintenance of biodiversity. Weeds being a host for rhizobacteria, also act as a source of various nutrients and organic matter which helps in rejuvenating degraded soils and preventing soil erosion. The heavy metals presence detection in the soil and its remediation with weeds helps in sustainable quality production of food. Biodiversity of weeds describes the enormous variety of weeds present in the niche. Maintenance of its biodiversity is crucial as they have enormous potential to serve as genetic source for crop yield and quality improvement and for control of insect pests and diseases in major food crops. Weeds can be utilized for fencing the fields. Allelochemicals present in weeds can be utilized as biological agent for controlling other weeds and thereby minimizing dependency on herbicides for ecofriendly products. The appreciation of the role of weeds in maintaining soil and biodiversity conservation is a key to the sustainable agriculture development.