With the expansion of urbanization and reducing the green space areas in cities, various strategies have been suggested to increase human contact with nature in cities. Some of them are vertical gardens and green wall systems. Apart from increasing human contact with nature in interior and exterior spaces, green wall systems have other advantages, including pollution control and energy conservation in the buildings. Also, with the increase in environmental issues, the use of organic acids enhances plant growth and prevents environmental pollutions. It seems that Syngonium and Pothos are suitable to be used in green wall systems since they possess favorable qualities such as fast climbing and coverage potentials. Therefore, in the present study considering the growth of the plants in an interior green wall condition, two separate factorial experiments were performed base on a completely randomized design with three replications. Two growing media types (cocopeat, vermicompost and zeolite (CVZ), and cocopeat, vermicompost and perlite (CVP) with ratios of 40v:10v:50v) were investigated under the influence of foliar application of humic acid with four concentration levels (0, 2, 4, and 6 mg/L). Based on the analysis of variance, there were significant differences (p≤0.01) in all the measured morphophysiological and biochemical factors between the treatments. Findings showed that in most cases, due to the application of perlite, CVP growing medium showed better results than CVZ. Also, by changing the concentration of humic acid to 4mg/L, root mass, stomata concentration, index, and length showed the highest amounts.

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