Abstract: Abstract: Carbon nano-materials (CNMs) due to their unique structure and physicochemical properties are being used in the field of material science, energy, environmental remediation and medicine. As the production and application of CNMs continues to expand, CNMs will be inevitably discharged into the environment and generate unknown impacts on plants and crop species. Presently, more and more studies on CNMs are concentrated around their interactions and distribution within plants especially crops. In this paper, we review the literature about impacts on plant growth generated by four types of CNMs (carbon nanotube, fullerene, carbon nano-onions and graphene). Previous studies reveal that CNMs-exposed plants exhibit different response to stress, including seed germination, root and stem growth, biomass yields and nutritional quality. In some cases, CNMs are shown to be helpful in seed germination, root growth, photosynthesis and crop production, such as the use of fullerenes in bitter melon, the effect of graphene oxide on red bean germination, the growth promoters effects of carbon nano-onions for gram plants, the ability of carbon nanotubes to enhance growth in tobacco cells, increase the seed germination and growth of tomato plants and cause root enhancement in wheat plants. Further mechanisms investigation of CNMs on plants showed that the carbon nanotubes could increase the protein expression of water channel, as tracheal elements of the xylem vessels are responsible for water channel transport in plants, results in the overall enhanced growth of plants. While the CNMs are useful to increase the crop production and fruit manifold, but there are many other aspects, CNMs are known to be phytotoxic and harmful. Reports show that graphene significantly inhibited plant growth and biomass levels. It also decreased the number and size of leaves in a dose-dependent manner and caused oxidative stress-induced necrosis in cabbage, tomato and red spinach seeds during development. The transmission of CNMs to the next generation coming from the treated seeds has been reported, the fullerene (C70) aggregates were found in second-generation seedlings when the first generation was exposed only during germination. The ability of CNMs transmitted to the progeny suggests the potential that CNMs may present chronic exposure hazard to human and other receptors. According to the studies, the toxic effect of CNMs on plants seems to be related to the nano-materials' concentration, the exposure time and the plant species used during the study. When nano-carbon was added to the fertilizer, nano-fertilizer was formed. Compared with the conventional fertilizer, the nanocarbon-synergistic fertilizer had the function of promoting the growth of the crops, nutrients content and fertilizer agronomic efficiency. The nano-synergistic fertilizer increased the rice yield of 10.3%, the spring maize of 10.9%-16.7%, the soybean of 28.8% and increased the soybean oil content of 13.2%. Nano-fertilizer also could improve the quality of the vegetables; the content of anthocyanin of summer radish was increased and the peel color turned prunosus. The amino acid content of celery treated with nano-synergistic fertilizer was shown to be 15.4%-70.0% higher than that with urea treatment. Compared to urea application alone, the nano-carbon fertilizer synergist was found to be able to improve N agronomic efficiency by 40.1% while minimizing N losses when added into urea. The mechanism of nano-synergistic fertilizer on crops showed that nano-carbon mixed with water became the superconductor, which increased the electric potential of soil and release large amounts of nutrient elements. However, it is still not fully understood how these actions induced by CNMs. Given the potential widespread application of nanotechnology in agriculture, resolution of this question remains a critical issue of concern. Importantly, more research is urgently needed in the area of CNMs-plant interactions; and with this fundamental knowledge, development of novel idea and guidance for implementation of CNMs in agriculture and food manufacturing will be possible.