If your lawn, garden, or turf is looking yellow and tired, our Iron (Ferrous) Sulphate Heptahydrate Powder is your go-to for deep, lasting green. It’s slower to act than fast chelate types, but that’s because it works steadily, building a long-term store of iron in the soil that can last for years. Ideal for improving plant colour, reducing moss, balancing soil pH, and promoting healthier, more resilient growth.
Lawns (Buffalo, Couch, Kikuyu & More)
Gardens (Veggies, Flowers, Trees, Pots)
Farms & Larger Properties
Our Iron Sulphate contains >19.5% Iron (Fe) and 11.5% Sulphur (S) in oxidised form.
| Product Summary: | Details |
|---|---|
| Form | Powder |
| Use Cases | Lawns, gardens, trees, farms |
| Application |
|
| Primary Benefits
|
Green-up, moss control, pH adjustment, soil health |
| Origin | Imported |
Keep out of reach of children. May be harmful if swallowed. If eaten seek medical help. ALWAYS TRIAL BEFORE CHANGE. Before a new rate, product or application method is used, a small trial is recommended. Warranty of this material, either expressed or implied, is limited to a guarantee of the composition as shown on this label in as much as uses are beyond the seller’s control. For the same reason, the seller is not liable for any injury to any living thing, crops, soils, or materials which may result from the use or storage of this material. As this is largely a mineral-based fertiliser made from natural resources, the analysis may change slightly. When applying the product, wear gloves, a dust mask, and old clothes to protect yourself, as it can stain paths, concrete, clothing, and skin. Keep pets off treated areas for one week, and horses for four weeks. Avoid spreading by hand on windy days; using a broadcast spreader is recommended for even coverage. If any product lands on paving, sweep it off immediately to prevent staining.
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| Purpose | Application Rate (g/m²) | Method | Notes |
|---|---|---|---|
| Correcting Iron Deficiency | 20 – 30 | Spread dry or mix with water and spray | Apply the product evenly at recommended rates per square metre. You can either spread the powder directly over the surface or dilute it in water and spray it on. After application, water the area thoroughly to activate the treatment. For ongoing effectiveness, reapply each season or as needed based on your lawn’s condition. |
| Soil Acidity Adjustment | 25 – 35 | Spread dry or mix with water and spray | To help improve soil acidity, apply the product evenly across the soil surface, either by spreading the powder or spraying a diluted solution. Follow with adequate watering. Repeat applications can be made as necessary to maintain optimal soil pH. |
| Moss Control | 10 – 20 | Spread dry or mix with water and spray |
For moss removal, apply evenly to affected areas, watering in well afterward. Application can be done most times of the year, with spring being the common period for treatment. However, more frequent applications every 6 to 8 weeks from late autumn through winter to early spring will help prevent moss growth during those cooler months. For best results, treat the entire lawn rather than only mossy patches, as iron sulphate acidifies the soil and can cause visible differences between treated and untreated areas. |
Application Method: Sulphate of Iron is a fine powder generally spread dry, ideally using a broadcast spreader for even coverage and to avoid powder blowing onto unwanted surfaces. It can also be diluted in water and sprayed on.
Safety: Apply on calm days to avoid wind blowing powder. Avoid spreading into the wind. Always wear protective gloves and a dust mask during application.
Post-application: Water the lawn thoroughly after spreading. Avoid walking on treated areas until they have been well watered in to prevent uneven treatment and staining.
Iron Sulphate is widely used to correct iron deficiency (chlorosis) in turf and plants, eliminate moss, reduce soil alkalinity (pH), and act as a trace micronutrient in fertilisers. It helps promote deep greening of turf grasses without excessive growth, improving lawn health naturally.
Iron Sulphate naturally acidifies soil through microbial breakdown, releasing sulphuric acid that lowers soil pH. This is beneficial in alkaline soils where iron becomes unavailable to plants. However, overuse can make soil too acidic, so it’s important to follow recommended application rates.
Spread evenly using a broadcast spreader or mix with water and spray. Recommended rates vary by purpose: 20-30g/m² for iron deficiency, 25-35g/m² for soil acidification, and 10-20g/m² to control moss. Always water in thoroughly after application and avoid walking on treated areas until soaked.
Yes, Iron Sulphate helps control moss by making the soil less hospitable. For effective moss removal, apply 10-20g per square metre every 6–8 weeks from late autumn to early spring and combine with lawn care practices like dethatching and overseeding.
Yes, Iron Sulphate can stain concrete, paths, clothing, and skin. Wear protective gloves and a dust mask when applying, avoid windy days, and keep pets off treated areas for at least a week. Horses should be kept off for four weeks to avoid grazing on treated turf.
Reapply Iron Sulphate every season or as needed based on soil and turf condition. Regular soil testing helps determine the best schedule and amount to use for ongoing lawn health and moss prevention.
Iron Sulphate is not compatible with many products and can react adversely. Always perform a jar test before mixing and follow label instructions to avoid clogging or reduced efficacy.
Soil testing identifies pH levels, organic matter, and nutrient deficiencies, helping you apply the right amount of Iron Sulphate safely and effectively. It prevents over-application, which can harm your lawn by making soil overly acidic.
Amount of Reviews: 2
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First time owning lawn. Gave the team at plant doctor a ring and they supplied me with a wealth of information. Products turned up quickly.
Will definitely be getting more 8 weeks difference been using stimulizer, activ8mate, soil wetter, seaweed secrets and champion fertiliser. Was super fast delivery.
Only have great things to say about Plant Doctor. Organic products and a competitive price, fast shipping and easy to contact with questions. Have had great results with the special mix for lawns, and my plants (indoor and outdoor) love the seaweed secrets. I am excited to test out some of the animal products soon!
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