This study aimed to evaluate the efficiency of salvinia proportions in the substrate composition to grow Jamaican nettletree seedlings. The chemical characteristics of the substrate were improved as the dosage increased, resulting in Al reduction and increased pH, CTC, base saturation, K, Ca, Mg, P and organic matter contents. Growth of Jamaican nettletree seedlings was influenced by the fertility levels of the substrate. The highest plant height, stem diameter, dry mass, and macronutrient accumulation were verified in treatments with 75% and 100% of the organic compound.