Soils 41 ??? It is a rich source of boron, iodine, calcium, magnesium, sodium and other trace elements ??? Readily available nutrients can cause nutrient toxicities (causing leaf burn) if overused ??? It is safe to mulch plants with a generous layer of seaweed about once every four years, making it suitable for long-term crops such as fruit and vine plants ??? Different types of seaweed have diffe