Seaweed extract is a liquid or powder derived from various species of seaweed. It is commonly used in agriculture and horticulture as a natural fertilizer and soil conditioner.Seaweed extract contains a wide range of nutrients and trace elements that are essential for plant growth and health, including nitrogen, phosphorus, potassium, magnesium, calcium, iron, and zinc. It also contains plant hormones, such as auxins and cytokinins, which can stimulate plant growth and development.