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In this study, CuO nanospindle synthesized using petal extract of Hibiscus cannabinus (H. cannabinus) was attempted to have better antibacterial activity against Gram-positive and Gram-negative bacteria. Cytotoxic activity was found to be 70 % against human acute myeloid leukemia HL60 cell line at 500 µg/ml. Morphological features of CuO was analyzed by scanning electron microscopy (SEM). Structural properties were analyzed by X-ray diffraction (XRD) pattern and the Fourier transform infrared (FTIR) spectrum of CuO provides additional evidence for the formation of monoclinic crystal structured CuO. Energy dispersive X-ray spectroscopy (EDAX) analysis exposed the pristine properties of CuO nanospindles.