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Iron Sulphate has many names and many uses around the lawn…
Most lawn fertiliser products will contain nitrogen and potassium with phosphate coming in a close third. However, a few other elements are also required by the grass in micro or trace amounts. These are chlorine, boron, iron, manganese, zinc, copper and molybdenum.
It is rare for soils other than poor sandy soils to be deficient in these elements. Of them all, iron is perhaps the main one that you will add in the form of iron or ferrous sulphate. This is beneficial as a green-up or as a cool weather turf hardener; toughening the plant to resist disease. It is also the best way to get rid of moss which we will discuss in the topic ‘getting rid of moss’.
As a component of chlorophyll it imparts a dark green colour to the lawn so is very useful in cool weather when colour is more important than growth. However, only apply when ground moisture is available and keep the dose on the light side in the summer to prevent grass burn.
Some fertiliser manufacturers add iron sulphate to lawn feed products to give an extra bit of green to the grass. The problem with this is that many domestic lawn products then stain paths, driveways, patios and decking. In my opinion the very slight benefit is outweighed by the damage (the staining is permanent) you cause to other parts of the garden. Lawnsmith products apart from Winter Green do NOT contain iron sulphate for this reason. Instead, seaweed, rich in iron and other beneficial properties is used.
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