The study commenced in March-September, 2023, in the canopy of the University of Kerbala, Kerbala, Iraq. The experiment’s implementation relied on a completely randomized block design (RCBD) with three factors. The first was pomegranate (Punica granatum L.) cultivars (Wonderful and Slimi), the second was the marine algae extract at three concentrations (0, 1.5, and 3 ml L^-1), and the third was the Humax acid at three concentrations (0, 0.25, and 0.50 g L^-1). The most important results revealed the Wonderful cultivar significantly superior to the Slimi cultivar in all studied vegetative traits, recording the highest average of the following: increases in the seedling height, seedling stem diameter, the number of leaves per seedling, the total leaf area, relative moisture content in the leaves, and dry matter percentage. The marine algae treatment of 3 ml L^-1 showed significant superiority to other extract concentrations in the vegetative growth trait. It included increases in the seedling height, seedling stem diameter, number of leaves per seedling, total leaf area, relative moisture content in the leaves, and dry matter percentage. Humax acid treatment of 0.50 g L^-1 was notably better than the other Humax acid concentrations in all studied vegetative traits.

Keywords: Pomegranate (P. granatum L.), cultivars, marine algae extract, Humax acid, growth traits

Key findings: The treatment of the cultivar Wonderful with 3 ml L^-1 of marine algae extract and 0.50 g L^-1 of Humax acid recorded the highest average in all vegetative growth traits of the pomegranate (P. granatum L.).