Best Universal Fertiliser: Our Top Pick and Who Should Skip It
Updated: October 2026
You have a patio, a few hanging baskets and a windowsill of houseplants, and you would rather buy one all-purpose feed than four specialist bottles. Of the six amazon.co.uk listings we compared, the best universal fertiliser for that job is the Miracle-Gro All Purpose Concentrated Liquid twin pack, but only if you will dilute it in a watering can. It is our top pick on review volume and job fit, not a laboratory result. Prices, stars and packs sit on the [universal fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/universal-fertiliser). A qualifying purchase can earn a commission at no extra cost to you.
You have a patio, a few hanging baskets and a windowsill of houseplants, and you would rather buy one all-purpose feed than four specialist bottles.
You have a patio, a few hanging baskets and a windowsill of houseplants, and you would rather buy one all-purpose feed than four specialist bottles. Of the six amazon.co.uk listings we compared, the best universal fertiliser for that job is the Miracle-Gro All Purpose Concentrated Liquid twin pack, but only if you will dilute it in a watering can. It is our top pick on review volume and job fit, not a laboratory result. Prices, stars and packs sit on the universal fertiliser comparison. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Form | Analysis | Suits | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Doff Doff Liquid Growmore 1 L | Liquid concentrate | 7:7:7 | Lowest shelf price | 7.6 | about £6.55 | View offer |
 Miracle-Gro Miracle-Gro All Purpose Liquid 1.6 L | Liquid concentrate | 7-3-5 on the label | Pots you will dilute | 7.9 | about £7.98 | View offer | |
| Alternative |  Miracle-Gro Miracle-Gro Continuous Release 1.8 kg | Coated granules | Not on the listing | One spring mix-in | 7.3 | about £11.94 | View offer |
On this page
What this page can call a top pick
Three different products lead on three different measures, which is why best needs a criterion.
We call the Miracle-Gro liquid the top pick because it combines the most reviews with a general job that a diluted liquid does well: feeding mixed pots, baskets and houseplants. That is a judgement about buyer evidence, not a trial. Which? has said that Miracle-Gro's all-purpose concentrate gave good growth on seedlings at a low dose in its own liquid-feed testing, but the public text does not tie that result to this twin pack, so we do not call any of these six a Which? Best Buy.
Miracle-Gro liquid, if you will use a watering can
The Miracle-Gro All Purpose Concentrated Liquid (model 121175) is the pick for pots, baskets and indoor plants when you already water by hand and will measure a dose each time. The brand's label, which we cite separately from the amazon.co.uk listing, gives a 7-3-5 compound and a rate of half a cap per litre, with a quarter cap for small or young plants. On that basis a 10-litre can takes five caps at standard strength. The listing itself prints no NPK, so check the label on the bottle you receive.
Buyers describe healthier houseplants, patio tubs that flower for longer and, in one review, new leaves on a struggling plant after about two feeds. The listing names both the garden and indoor houseplants. Several buyers say the 800 ml bottles look three-quarters full, others find a fraction of a cap per litre fiddly for a full can, and one reviewer who fed every two to three days saw no change. If you forget to feed pots, a liquid will not help you.
When the cheaper bottle or the granules fit better
If you want the lowest price and a measure built into the cap, Doff Liquid Growmore is the best value in this set. Its weakness is the sample: 86 reviews is a thin base for a 4.8 average. The dose also needs care, because the amazon.co.uk mixing-ratio field says 1:466 while one reviewer uses one cap to 4.5 litres. Follow the bottle, not the review.
If you would rather mix once than measure weekly, the Miracle-Gro Continuous Release twin pack (£11.94 for 1.8 kg, 4.6 from 2,641 reviews) claims one application at the start of spring feeds plants for the season. One buyer says the pellets look like plastic and do not break down in the soil, and a repeat buyer with a bigger garden ran out early. The Topline tub suits beds rather than pots. A UK reviewer says the pack reads 7-7-7, against a 20:20:20 analysis field, and split tubs are a repeated complaint.
Who should buy none of them
An all-purpose feed is not the answer for every plant. The RHS says most plants in open ground do not need a constant feed, so a bed with decent organic matter may need very little. Ericaceous plants such as rhododendrons usually want a feed made for them. Fruiting crops need a different balance once the fruit is setting, which our all-purpose fertiliser for vegetables page explains.
Before you buy, read our buying guide for how to read the label. After you buy, our how to use all-purpose fertiliser page covers the dose and when to stop.
Common questions
Which universal fertiliser has the most reviews on amazon.co.uk?
In this comparison, the Miracle-Gro All Purpose Concentrated Liquid twin pack has the most, with 3,025 reviews and a 4.6 out of 5 average at £7.98. The Miracle-Gro Continuous Release twin pack follows with 2,641 reviews at 4.6 stars. Review counts and prices were checked on 15 October 2026 and can change.
Which bottle is the cheapest?
Doff Liquid Growmore is the lowest shelf price in this set at £6.55 for 1 litre, with a 4.8 out of 5 rating from 86 reviews. By weight, the Topline 8 kg tub is cheaper at about £3 per kilogram, but its analysis field is disputed and reviewers report split tubs.
Does a 4.8-star score beat 4.6 stars?
Not automatically. Doff's 4.8 comes from 86 reviews, while Miracle-Gro's 4.6 comes from 3,025. A small sample can swing further than a large one. Doff is the best value here, but the Miracle-Gro liquid has the stronger evidence, so it is the top pick.
Is the 8 kg Topline tub the best value for a patio?
Usually not. The price per kilogram is low, but 8 kg is more than a few pots will use, a UK reviewer disputes the 20:20:20 analysis field, and split tubs are a repeated complaint. It suits beds and borders better than patio containers.
Can any of these be called a Which? Best Buy?
No. Which? has published its own feed trials, but the public text does not name these amazon.co.uk twin packs and tubs as its Best Buys. We have not run a lab test either, so top pick here means our reading of listings and reviews.
Who should skip an all-purpose fertiliser?
Skip it if your open-ground soil is in good heart and your plants look healthy, because the RHS says most plants there do not need constant feeding. Also skip it for ericaceous plants and for fruiting crops once the fruit has set, which usually need a different feed.
Related pages
Sources
Public UK and manufacturer sources used for this comparison; last accessed 15 October 2026.
- RHS: Fertilisers (retrieved 15 October 2026)
- RHS: Nutrition and feeding plants (retrieved 15 October 2026)
- RHS: Fertiliser labels explained (retrieved 15 October 2026)
- GOV.UK: Manufacturing and marketing fertilisers (retrieved 15 October 2026)
- The Fertilisers Regulations 1991 (retrieved 15 October 2026)
- Miracle-Gro All Purpose Concentrate label 121175 (retrieved 15 October 2026)
- Which?: Controlled-release fertilisers (retrieved 15 October 2026)
- NHS: Poisoning (retrieved 15 October 2026)