No. Water-soluble fertilizers are not toxic. Water-soluble fertilizer is a kind of compound fertilizer which is completely soluble in water and contains nitrogen, phosphorus, potassium, calcium, trace elements, amino acids and other substances. Silicon Valley Red Pengguo water-soluble fertilizer has no toxicity of liquid fertilizer. Macro-elements refer to the essential nutrient elements needed for normal growth and development of plants or with large content.