Consumer advocacy teardown
Evergreen Complete 4-in-1 Lawn Feed & Moss Killer alternative & active ingredient dupe
Stop paying £24.00 for Evergreen. The bulk active is Agricultural soluble iron(II) sulphate heptahydrate — 91% less per working litre than a typical pack.
- Active
- Ferrous sulphate heptahydrate
- CAS
- 7782-63-0
- Dupe
- Agricultural soluble iron(II) sulphate heptahydrate
- Saving
- 91% / L
Saving is per litre of working-strength mix versus a typical pack price, not versus the DIY kit total. Shop prices move — always check the listing.
The Marketing Claim & The Catch
A typical 100 m² box pack of Evergreen Complete 4-in-1 Lawn Feed & Moss Killer is about £24.00 in lawn & garden. That is a snapshot, not a live Amazon price — listings, sizes and deals move. The marketing line is that you are buying a finished lifestyle product, not a weighed chemical.
On the pack: Feeds the lawn, kills moss, thickens turf and controls weeds; Greener grass in days; and One box treats 100 m².
The catch: The moss-blackening punch is ferrous sulphate — the same agricultural iron used on bowling greens. The 4-in-1 box is mostly filler, NPK dust and a brand. Buy the salt.
- “Feeds the lawn, kills moss, thickens turf and controls weeds”
- “Greener grass in days”
- “One box treats 100 m²”
Proprietary Blend & Dosage Breakdown
The labelled active is Ferrous sulphate heptahydrate at 100%. Everything else in the pack is granular filler and turf surfactant.
Even when the pack is sold as “pure” or ready-to-use, the dose that actually does the work is Ferrous sulphate heptahydrate. The rest is how they get it into a bottle you will pick up.
Branded working strength is whatever comes out of the bottle. The bulk alternative is 100% Agricultural soluble iron(II) sulphate heptahydrate, mixed to 10 g/m².
- Labelled active
- Ferrous sulphate heptahydrate
- 100%
- Carrier
- Granular filler and turf surfactant
- Retail pack
- 100 m² box · £24.00
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Agricultural soluble iron(II) sulphate heptahydrate at 100% bulk. Indexed as CAS 7782-63-0, formula FeSO4·7H2O. Buy it as 25 kg for about £18.50 from Amazon UK.
Working strength: 10 g/m². Indicative cost £0.45 per diluted litre — 91% below a typical branded pack on a per-litre basis, before you reuse leftover bulk.
Follow the mixing method and the supplier SDS. Wear the listed PPE. Do not mix incompatible oxidisers, acids or ammonia.
- Ferrous sulphate stains stone, clothing and skin. Wear gloves and goggles; keep off patios.
- Apply 10 g per m² (1 kg per 100 m²). A 25 kg sack treats approximately 2,500 m².
- Dissolve in water at 10 L per 100 m² and apply with a watering can or boom, or spread dry and water in.
- Moss blackens within 48 hours. Rake out dead moss after 1–2 weeks and overseed bare patches.
- Do not apply to drought-stressed turf, and never mix with lime in the same tank.
Mixing desk
Dilution calculator
Switch between filling a sprayer and covering a measured surface. Figures are educational estimates from the listed ratio — always check the SDS.
Formula
Agricultural soluble iron(II) sulphate heptahydrate
- Concentrate
- 1,000 g
- grams of solid
- Water
- 10 L
- carrier volume
- Batch cost
- £0.74
- 10 L working solution
- Saved vs retail
- £23.26
- 97% · retail £24.00
Estimated coverage at the listed rate: 100 m².
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedEvergreen | Raw active dupeDupeStack |
|---|---|---|
| Product | Evergreen Complete 4-in-1 Lawn Feed & Moss KillerAmazon UK search — listing, not a confirmed seller | Agricultural soluble iron(II) sulphate heptahydrate |
| Pack / unit | 100 m² box · £24.00 | 25 kg · £18.50 |
| Active | Ferrous sulphate heptahydrate at 100%Carrier: Granular filler and turf surfactant | 100% bulkFeSO4·7H2O |
| CAS number | Not disclosed on pack | 7782-63-0 |
| Working strength | Ready-to-use pack | Dilute 10 g/m² |
| Cost per litre | £24.00 / pack | £0.45 / L mixed from bulk |
| Headline saving | Baseline | 91% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene)Eye protection. Indirect-vent splash goggles — not ordinary spectaclesVentilation. Use outdoors or with mechanical extraction |
Active ingredient and cheaper alternative — FAQ
What is the active ingredient in Evergreen?
Evergreen Complete 4-in-1 Lawn Feed & Moss Killer is labelled as Ferrous sulphate heptahydrate at 100%. The carrier is Granular filler and turf surfactant. Pack size: 100 m² box. The bulk equivalent we index is Agricultural soluble iron(II) sulphate heptahydrate (CAS 7782-63-0).
Is Agricultural soluble iron(II) sulphate heptahydrate safe on lawns?
Used at the listed working strength (10 g/m²), the dupe is the same chemistry as the branded pack for lawns, beds and pots. That is not a blanket all-clear: read the supplier SDS, wear the listed PPE, keep acids away from hypochlorite, and follow UK HSE/COSHH rules. Wellness teardowns are supplements, not medicines.
Is there a cheaper alternative to Evergreen Complete 4-in-1 Lawn Feed & Moss Killer?
Yes. The bulk equivalent is Agricultural soluble iron(II) sulphate heptahydrate (CAS 7782-63-0). Indicative saving 91% per working litre versus a typical £24.00 pack. Working strength: 10 g/m². Live shop prices move.
How do you mix the Evergreen Complete 4-in-1 Lawn Feed & Moss Killer dupe stack?
Ferrous sulphate stains stone, clothing and skin. Wear gloves and goggles; keep off patios. Apply 10 g per m² (1 kg per 100 m²). A 25 kg sack treats approximately 2,500 m². Dissolve in water at 10 L per 100 m² and apply with a watering can or boom, or spread dry and water in. Moss blackens within 48 hours. Rake out dead moss after 1–2 weeks and overseed bare patches. Do not apply to drought-stressed turf, and never mix with lime in the same tank.
DupeStack provides chemical concentration data and educational mixing guides. Always review official manufacturer Safety Data Sheets (SDS) and comply with UK Health and Safety Executive (HSE) and COSHH regulations when handling concentrated substances. Some links on this site are affiliate links.
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DIY stack · 91% / L vs branded
£41.48indicative kit · Amazon cannot add a mixed search kit as one basket