Will Iron Sulphate Kill Grass?

Iron sulphate blackens all leaves but does not kill grass blades. If the lawn is cut a few days after being sprayed, the blackened ends of grass blades will be removed. Because iron sulphate is a by-product of industry, it may be obtained in large quantities at a very moderate cost of a few cents per pound.

What does iron sulphate do to grass?

Iron Sulphate blackens and kills moss while it greens and strengthens grass, which is pretty much the dream combo for a spotless lawn! You'll need to mix Iron Sulphate with water to use it, so if you're having trouble getting rid of a pesky patch of moss, simply mix your solution a little stronger than usual.

When should I put down iron sulphate on my lawn?

When to apply iron sulphate

Avoid frosty days or freezing temperatures. And make sure the soil is moist before you apply the mixture. If you're using it at lower concentrations as a fertiliser, you can apply it any time through spring to autumn. Just avoid periods of very strong sunshine.