Lawn & garden
Miracle-Gro All Purpose Liquid Plant Food dupe
Why pay around £6.00 for Miracle-Gro? The bulk active is Soluble NPK 20-20-20 (hydroponic grade) — 80% less per working litre than a typical shelf pack.
From the retail pack to the active and the mix
1 · Retail
Miracle-Gro All Purpose Liquid Plant Food
1 litre · £6.00 typical snapshot
Water
2 · Active
Soluble NPK (approx. 8-7-6)
21% on the label
66455-26-3N + P2O5 + K2O
Bulk Soluble NPK 20-20-20 (hydroponic grade)
3 · Mix
1 g/L
£0.01 per working litre · 80% less than the shelf pack
- Active
- Soluble NPK (approx. 8-7-6)
- CAS
- 66455-26-3
- Dupe
- Soluble NPK 20-20-20 (hydroponic grade)
- Saving
- 80% / 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.
Label teardown
What the pack promises versus what the label chemistry actually is.
The marketing claim
“Instant feed for pots, beds and baskets”
The chemical reality
A dilute bottle of soluble NPK. Hydroponic 20-20-20 (or similar) powder is the same three numbers, un-dyed and un-marketed, at a gram per litre instead of a capful of coloured water.
Active vs filler
21% Soluble NPK (approx. 8-7-6) · 79% carrier / filler — Water
- Typical retail
- £6.00
- 1 litre
- Estimated active cost
- £0.01
- Scaled from bulk £12.00 / 1 kg
- Indicative markup
- 500.0×
- Snapshot maths, not a live shop price
The Marketing Claim & The Catch
A 1 litre pack of Miracle-Gro All Purpose Liquid Plant Food typically retails around £6.00 in lawn & garden. That is a UK shelf-price snapshot for the maths on this page — not a live shop quote or a manufacturer RRP. Listings, sizes and deals move. The marketing line is that you are buying a finished lifestyle product, not a weighed chemical.
On the pack: Instant feed for pots, beds and baskets; More blooms, greener leaves; and Mix with water and pour.
The catch: A dilute bottle of soluble NPK. Hydroponic 20-20-20 (or similar) powder is the same three numbers, un-dyed and un-marketed, at a gram per litre instead of a capful of coloured water.
- “Instant feed for pots, beds and baskets”
- “More blooms, greener leaves”
- “Mix with water and pour”
Proprietary Blend & Dosage Breakdown
The labelled active is Soluble NPK (approx. 8-7-6) at 21%. Everything else in the pack is water.
At 21% active, most of what you pay for is carrier and packaging. The brand is selling convenience, fragrance and a label — not a uniquely potent molecule.
Branded working strength is whatever comes out of the bottle. The bulk alternative is 60% Soluble NPK 20-20-20 (hydroponic grade), mixed to 1 g/L.
- Labelled active
- Soluble NPK (approx. 8-7-6)
- 21%
- Carrier
- Water
- Retail pack
- 1 litre · £6.00
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Soluble NPK 20-20-20 (hydroponic grade) at 60% bulk. Indexed as CAS 66455-26-3, formula N + P2O5 + K2O. Buy it as 1 kg for around £12.00 from Amazon UK.
Working strength: 1 g/L. Indicative cost £0.01 per diluted litre — 80% 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.
- Wear gloves when handling the powder. Avoid inhaling dust.
- Dissolve 1 g per litre of water for a general foliar/root feed (1 kg yields ~1,000 L).
- For hungrier tomatoes or baskets, 1.5–2 g/L. Flush pots monthly to avoid salt build-up.
- Do not exceed the rate — fertiliser burn is real.
- Store sealed and dry.
Dilution recipe
5 L sprayer
Working strength 1 g/L. Educational estimate from the listed ratio — check the SDS before you mix.
Chemical
5 grams
Soluble NPK 20-20-20 (hydroponic grade)
Water
5 litres
Carrier / diluent
0% concentrate · 100% water by working volume (solids are dissolved into the water share).
Required PPE
Loading calculator…
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedMiracle-Gro | Raw active dupeDupeStack |
|---|---|---|
| Product | Miracle-Gro All Purpose Liquid Plant FoodAmazon UK search — listing, not a confirmed seller | Soluble NPK 20-20-20 (hydroponic grade) |
| Pack / unit | 1 litre · £6.00 | 1 kg · £12.00 |
| Active | Soluble NPK (approx. 8-7-6) at 21%Carrier: Water | 60% bulkN + P2O5 + K2O |
| CAS number | Not disclosed on pack | 66455-26-3 |
| Working strength | Ready-to-use pack | Dilute 1 g/L |
| Cost per litre | £6.00 / L typical pack | £0.01 / L mixed from bulk |
| Headline saving | Baseline | 80% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene)Ventilation. Use outdoors or with mechanical extraction |
Active ingredient and cheaper alternative — FAQ
What is the active ingredient in Miracle-Gro?
Miracle-Gro All Purpose Liquid Plant Food is labelled as Soluble NPK (approx. 8-7-6) at 21%. The carrier is Water. Pack size: 1 litre. The bulk equivalent we index is Soluble NPK 20-20-20 (hydroponic grade) (CAS 66455-26-3).
Is Soluble NPK 20-20-20 (hydroponic grade) safe on lawns?
Used at the listed working strength (1 g/L), 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 Miracle-Gro All Purpose Liquid Plant Food?
Yes. The bulk equivalent is Soluble NPK 20-20-20 (hydroponic grade) (CAS 66455-26-3). Indicative saving 80% per working litre versus a pack that typically retails around £6.00. Working strength: 1 g/L. Live shop prices move.
How do you mix the Miracle-Gro All Purpose Liquid Plant Food dupe stack?
Wear gloves when handling the powder. Avoid inhaling dust. Dissolve 1 g per litre of water for a general foliar/root feed (1 kg yields ~1,000 L). For hungrier tomatoes or baskets, 1.5–2 g/L. Flush pots monthly to avoid salt build-up. Do not exceed the rate — fertiliser burn is real. Store sealed and dry.
DupeStack provides chemical concentration data and educational mixing guides only. Wellness pages compare food supplements, not medicines or prescribed treatments. Always review the supplier Safety Data Sheet (SDS) and comply with UK Health and Safety Executive (HSE) and COSHH regulations when handling concentrated substances. Mixing and storage are at your own risk. Some links are affiliate advertisements (Amazon Associates, eBay Partner Network, and Awin when those programmes are live). Commissions do not change listed concentrations or calculator output.
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£22.98Save 80% / L
Indicative DIY stack