Honey guava (Syzygiym aqueum) is a fruit plant that grows well in areas with an altitude of 3 – 500 meters above sea level. This research was carried out on Jl. Madura, Pahlawan Village, North Binjai District, Binjai City, North Sumatra Province with a height of 28 meters above sea level. This research used a non-factorial randomized block design (RAK) with 4 treatment levels, namely: P0 = 0 ml/liter of air, P1 = 2 ml/liter of air, P2 = 4 ml/liter of air, P3 = 6 ml/liter of air. The observation parameters for this research include plant height (cm), number of leaves (sheet), leaf area (cm2 ), number of branches (branch), branch length (cm) and stem diameter (mm).