Iron Sulphate Lawn Treatment

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Protect your lawn from moss and add that vibrant, luscious green we love, with high-quality iron sulphate (Ferrous Sulphate) from Feeds & Seeds. This iron sulphate is:

- High-quality and uncut, ensuring you are only adding pure iron sulphate to your lawn
- Designed to be applied either dry or diluted with water
- Delivered in resealable Gripseal bags
- Available in sizes from 250g up to 20 kg

How do I use your iron sulphate?

Iron sulphate can be used in a variety of ways. Take a look at our recommended dosage below:

Controlling Moss

If you’re using iron sulphate to control moss, we recommend applying it dry during rain or when it is forecast to rain. Simply sprinkle the powder at a rate of 5-10 grams per square metre of lawn. If no rain is forecast, just dissolve the 5-10 gms per litre of water and spray using a watering can or sprayer.

Example:

- For a 10m2 lawn, use a maximum of 80g of iron sulphate in 10 litres of water 
- For a 100m2 lawn, use a maximum of 800g of iron sulphate in 100 litres of water
- For a 1000m2 lawn, use a maximum of 8kg of iron sulphate in 1000 litres of water

"Green up" Your Lawn

If you are already moss free and just want to condition and "green up" your lawn, first do a sample patch with a 1% solution (1 gram per litre). If it doesn’t show much change then increase the percentage but be careful not to overdose the grass. Increase the percentage a little at a time, too strong will damage the lawn.

Example:

- For a 10m2 lawn, use a maximum of 100g of iron sulphate in 10 litres of water 
- For a 100m2 lawn, use a maximum of 1kg of iron sulphate in 100 litres of water
- For a 1000m2 lawn, use a maximum of 10kg of iron sulphate in 1000 litres of water

Acidify My Soil

You can also use Iron Sulphate to acidify your soil for your ericaceous plants such as Azaleas, Camellias and Rhododendrons. The dosage for this is 20-35 grams per litre of water.

Example:

- For a 10m2 garden patch, use a maximum of 200g of iron sulphate in 10 litres of water 
- For a 100m2 lawn, use a maximum of 2kg of iron sulphate in 100 litres of water
- For a 1000m2 lawn, use a maximum of 20kg of iron sulphate in 1000 litres of water


If you’re feeling a little unsure about the exact dosage for your lawn, try not to worry. You can’t really go wrong with iron sulphate and you can quickly scale up and down the amount you’re adding.

What’s the difference between Ferrous Sulphate and Iron Sulphate?

There is no difference. Iron Sulphate is just the more common name for Ferrous Sulphate. Iron sulphate is an excellent moss killer and will help “green up” your lawn during spring, summer and autumn.