The investigation entitled “Effect of nitrogen and potassium on growth and flowering of Calendula officinalis” was carried out in the Agri-farm of the Department of Horticulture, School of Agriculture, Lovely Professional University, Punjab, India, during 2022 - 2023. The experiment consists of 16 different treatments with three replications and was laid out in a randomized block design. The treatments included T1: (Control), T2 (10gN + 10gK/m2), T3 (15gN + 10gK/m2), T4 (20gN + 10gK/m2), T5 (25gN + 10gK/m2), T6 (30gN + 10gK/m2), T7 (10gN + 20gK/m2), T8 (15gN + 20gK/m2), T9 (20gN + 20gK/m2), T10 (25gN + 20gK/m2), T11 (30gN + 20gK/m2), T12 (10gN + 30gK/m2), T13 (15gN + 30gK/m2), T14 (20gN + 30gK/m2), T15 (25gN + 30gK/m2), T16 (30gN + 30gK/m2). Significant differences were observed among different treatments for various vegetative and flowering parameters. Among various parameters, maximum plant height (84.16 cm), stem diameter (8.59 mm), flowering duration (38.66 days) and minimum days for flower bud initiation (46 days) and minimum days for 50% of flowering (91 days) were recorded in treatment T15 (25gN + 30gK/m2). Whereas maximum numbers of branches per plant (12.55), leaves per plant (50.33), flowers per plant (128.33), flowers per meter square(1540), maximum individual flower weight (1.91g) and flower yield (2941.4 g/m2) were reported in treatment T4 (20gN + 10gK/m2). It was concluded that flowering and yield calendula plants be fertilized with N and K @ 20 and 10g/m2 for better growth, respectively.