Iron Sulphate is great for helping to kill off flat leaf weeds, like bindii, in lawns.

Iron Sulphate is also helpful for killing moss in lawns.

Jerry Colbey-Williams explains how in this video

Iron Deficiency in Plants

Iron deficiency symptoms vary somewhat with plant species, however a general symptom is the yellowing in between leaf veins. This is most noticeable in the younger leaves. There is usually a sharp distinction between the yellow and green portions. Fruit may also have poor colour. In severe cases, the whole leaf turns yellow, including the veins.

Some Australian native plants are very sensitive to the nutrient Phosphorus(P). Iron sulphate can be beneficial for use around these plants as the iron sulphate helps to lock up phosphorus in the soil and acidify the soil at the same time.