The best flower fertilisers, compared.
Top pick: Miracle-Gro All Purpose concentrate, 2 x 800 ml – Highest score, 74, tied with the 10-sachet vase food; 4.6 from 3,025 reviews takes the top pick. Mix with water. The ratio field is blank. About £7.98. Best value: Baby Bio Pour & Feed, 1 litre – Lowest shelf price among listings that state how to use the pack and have no pack clash, about £5.81. The highlight says no dilution. Updated October 2026.
Flowers fertiliser on amazon.co.uk covers three jobs you should not treat as the same product. A soil feed is for ordinary flowering plants in pots, baskets and borders. An ericaceous feed is for lime-hating shrubs such as azaleas, camellias and rhododendrons. A sachet is for cut stems in a vase, and it does not feed a bed. You are usually buying for a patio pot, a shrub that hates lime, or a supermarket bunch, and the pack only works when the job on the label matches that use. Quality is the declared nutrients and the dose on the label. The Royal Horticultural Society treats potassium as the flowering nutrient and says to stop general feeding after September. Check whether the bottle is ready to pour or a concentrate you must dilute, and check that the form, the weight and the plant names agree. A [flowers fertiliser buying guide](/hub/fertiliser-soil-and-bark-mulch/flowers-fertiliser/sub/flowers-fertiliser-buying-guide) separates vase, all-purpose and ericaceous feeds before you compare packs.
Flowers fertiliser on amazon.co.uk covers three jobs you should not treat as the same product. A soil feed is for ordinary flowering plants in pots, baskets and borders.
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Personal buying guide
Question 1 of 2
What are you feeding?
Across 3,025 amazon.co.uk reviews, this Miracle-Gro All Purpose concentrate is a mix-with-water liquid for garden and indoor houseplants, sold as two 800 ml bottles at about £7.98. The bullets call it a concentrated formula, and one reviewer describes measuring a half or a quarter into each litre and remixing, which they found long-winded. The mixing-ratio field on the listing is blank, so that habit is a reviewer's method, not a ratio printed on the listing. Other reviews say indoor plants thrived after years of use, a reduced-price tree picked up after two applications, and planters looked better once the feed was mixed with tap water. Reviews also say bottles looked only about three-quarters full, and that the liquid costs more than granules. It is the top pick in this set because the listing states the job and that you must dilute it, and the review count is the larger of the two listings on 74 points, not because 4.6 is a laboratory result. It is the wrong bottle for a vase, and the wrong substitute for an ericaceous shrub.
Pros
Cons
Best for: Garden and indoor houseplants when you will measure a concentrate into water.
Less suitable: A vase, a camellia or azalea that needs an ericaceous feed, or anyone who will not measure.
Specifications
Common questions
Does this Miracle-Gro bottle need diluting?
Yes. The bullets call it a concentrated formula that mixes with water. One review describes measuring a half or a quarter into 1 litre. The mixing-ratio field on the listing is blank.
Can you use it indoors?
The bullets say garden and indoor houseplants.
Is it a vase food?
The vase-use line is blank. The listing is a concentrated plant food for garden and houseplants.
These Miracle-Gro granules are named for azalea, camellia and rhododendron, listed at about £8.10, and the listing says no mixing is required. The bullets claim a coated feed and one application at the start of spring for the season. The pack size on the title is blank. The item weight is 900 g and the unit count is 1.0 count, which does not state that weight. Across 785 amazon.co.uk reviews at 4.6, a camellia revived although the granules took weeks to dissolve, and azaleas that had been moved put on leaves after the granules were dug in. A reviewer also used it on heathers and hebes; that is not the spec list. One order was not delivered and was blamed on the carrier. It is not a vase food.
Pros
Cons
Best for: Azaleas, camellias or rhododendrons when you want coated granules rather than a weekly liquid.
Less suitable: A vase, ordinary bedding, or a buyer who needs the weight printed in the title.
Specifications
Common questions
Which plants does the spec name?
Azalea, camellia and rhododendron. A review used it on heathers and hebes; that is not the spec list.
Does it need mixing?
No. The listing says no mixing is required.
What is the pack weight on the title?
The pack size on the title is blank. The item weight is 900 g and the unit count is 1.0 count.
Miracle-Gro Pour and Feed is two 1 litre bottles of liquid plant food at about £8.98, and the bullets only say Plant Food, Easy to use and Good product for use. The listing does not say whether you dilute it. One review says it does not need diluting, and another says they diluted it and fed monthly, so neither line is the label. Across 5,343 amazon.co.uk reviews at 4.5, people describe healthier indoor leaves, liquid poured around the base in the garden, and blooms after one or two caps a week. At least one review had not used the product, and another credits the weather as well as the feed. The vase-use field is blank. The review count is the largest in this set, and the page still does not tell you the dose.
Pros
Cons
Best for: Someone who already knows this pour-on from the label on the bottle in their hand.
Less suitable: A first buy when you need the listing itself to say dilute or pour neat, or a vase.
Specifications
Common questions
Does Miracle-Gro Pour and Feed need diluting?
The spec does not say. One review says it does not need diluting and another says they diluted it. Do not treat either review as the label.
What dose does the listing give?
The application rate is not stated. The bullets are only Plant Food, Easy to use and Good product for use.
Is it for a vase?
The vase-use line is blank. The listing is a liquid plant food.
Baby Bio Pour & Feed is a ready-to-use 1 litre at about £5.81, and the item highlight says no dilution is required. You pour it on. The highlight names indoor houseplants, and the bullets also say garden plants, though the outdoor-plants question on the listing is unanswered. Across 1,365 amazon.co.uk reviews at 4.5, people mention vigorous houseplants after a couple of doses and struggling garden plants recovering, and they praise not having to mix. The same reviews say the litre does not last as long as concentrated Baby Bio, that the colour is lighter so the strength was doubted, and that one buyer had not realised the bottle was already dilute. The mixing-ratio field reads 2.5:1.05:0.45, which is not a dilution instruction. It is the best value here because £5.81 is the lowest shelf price among listings that state how to use the liquid and do not clash on pack size. A bullet suggests pairing it with Baby Bio Bug Killer and Leaf Shine, and those are not in the pack.
Pros
Cons
Best for: Pots and houseplants when you want to pour and not measure a cap.
Less suitable: A large border that would empty a litre quickly, a vase, or lime-hating shrubs.
Specifications
Common questions
Does Baby Bio Pour & Feed need diluting?
No. The item highlight says no dilution is required. The mixing-ratio field is not a dilution instruction.
Is it only for indoor plants?
The highlight says indoor houseplants. The bullets also say pour onto garden and houseplants. The outdoor-plants question is unanswered on the listing.
Does the pack include a bug killer?
No. A bullet suggests pairing with Baby Bio Bug Killer and Leaf Shine, and those are not in the pack.
Fleur vital is 50 sachets of cut-flower food at about £5.75, and the where-to-use line is vase only. The mixing field is 1:0.5 and the liquid volume is 0.5 litres, but the bullets do not state the steps. The item weight is 4 g, which is not plausible for a 50-sachet pack. Across 890 amazon.co.uk reviews at 4.5, people say flowers stayed fresher, including cut sweet peas and a Tesco bunch, and one bouquet was still partly fresh at about two weeks. Reviews also record vase water that became thick and cloudy, one buyer who saw no benefit, and one report of browning within two hours and death overnight, including a second bunch. A review claims 47 sachets rather than 50, with leaks; that count is that reviewer's claim. Country of origin is China.
Pros
Cons
Best for: A vase routine when you will change water that turns cloudy and you already treat one sachet as about half a litre.
Less suitable: Plants in the ground, or a buyer who needs the packet weight to match 50 sachets.
Specifications
Common questions
Is this for plants in the ground?
No. Where to use is vase only.
How is one sachet mixed?
The mixing field is 1:0.5 and the liquid volume is 0.5 litres. The bullets do not state the steps.
Does the item weight match 50 sachets?
The item weight is 4 g. That is not plausible for a 50-sachet pack.
Oasis Flora Life is a 100-pack of clear-powder sachets at about £7.15 for cut flowers in a vase, and the listing says it is not a soil feed. You dissolve one sachet in the vase water. The bullets do not state the millilitres, while the liquid-volume field says 1 litre, so those two lines do not tell you the same volume. Across 455 amazon.co.uk reviews at 4.5, people say stems stayed fresh when they renewed the food every 2 to 3 days, and that sachets are easier than bottles for garden-picked flowers. Powder caked inside sachets and had to be scraped or soaked out. The brand field says KEXMY and the manufacturer is Smithers Oasis. It will not feed a border.
Pros
Cons
Best for: Someone who buys or picks bunches often and wants a large stock of vase powder.
Less suitable: A plant in a pot or a bed, or a buyer who needs the water volume printed in the bullets.
Specifications
Common questions
Is this a garden fertiliser?
No. It is for cut flowers in a vase, not a soil feed.
How much water is one sachet for?
The bullets do not state millilitres. The liquid-volume field says 1 litre.
Who makes it?
The brand field is KEXMY and the manufacturer is Smithers Oasis.
Westland ericaceous granules are a 900 g jar in the title and the unit count, listed at about £6.00, with a bullet that says a 3 month slow release. The item weight is 770 g, so the parcel figure does not match the jar on the title. The coverage field says ericaceous plants and the target-species field says rhododendrons. An azalea question on the listing has no answer line. Across 282 amazon.co.uk reviews at 4.5, azaleas and rhododendrons bloomed, yellowing japonicas greened after a few weeks, and a small amount lasted one reviewer a season. Several reviewers said it was too early to judge, packaging arrived opened, and a Prime offer was quoted at about two weeks. It does not go in a vase.
Pros
Cons
Best for: Rhododendrons and other ericaceous shrubs when a 3 month granule claim matches how often you want to feed.
Less suitable: A vase, a general bedding scheme, or a buyer who needs the weighed jar to match 900 g.
Specifications
Common questions
How long do the bullets say it lasts?
A 3 month slow release.
Does the jar weigh 900 g?
The title and unit count say 900 g. The item weight is 770 g.
Is it for every plant?
The coverage field says ericaceous plants. The target-species field says rhododendrons. An azalea question on the listing has no answer line.
Topline Grownmore granules are an 8 kg tub at about £23.99 for outdoor garden use, and the bullets say to apply every 4 to 6 weeks from February to the end of October. They claim equal proportions of nitrogen, phosphorus and potash and do not give figures. The mixing-ratio field reads 20:20:20, which is not a declared analysis, so this listing is not a printed 7-7-7. Across 136 amazon.co.uk reviews at 4.5, people found it easy to sprinkle and rake in when the tub was intact, and one used it on tomatoes. Reviews also record a tub that arrived pouring granules down the drive with very little left, plus damaged cardboard, and a view that it may be too strong for some plants other than tomatoes. Grams per square metre are not printed on the listing. The vase-use field is no.
Pros
Cons
Best for: An outdoor bed or vegetable row where you can store 8 kg and will read a gram rate on the tub itself.
Less suitable: A few pots, a vase, indoor plants, or a camellia that needs an ericaceous feed.
Specifications
Common questions
Is the Topline tub a declared 7-7-7?
No figure is given. Bullets say equal proportions of nitrogen, phosphorus and potash. The mixing-ratio field reads 20:20:20 and is not a declared NPK.
How often do the bullets say to apply it?
Every 4 to 6 weeks from February to the end of October. Grams per square metre are not stated.
Can it go in a vase?
No. It is garden granules.
This Oasis Floralife 10-pack is listed at about £3.69, and the bullets say each 4 g sachet makes 0.5 litre with no extra measuring. A review said a large vase needed two. Across 349 amazon.co.uk reviews at 4.4, yellow roses were still good after a week, drooping tulips perked up, and one reviewer said the water stayed clear. The photo did not match the plain dark green sachets one buyer received, and another called the result modest against a hope of more than a week. The unit count is 4.0 gram, which matches one sachet, not the pack of 10, and the item weight is 50 g. The brand field says floral supplies and the manufacturer is Smithers Oasis. It is vase food, not a garden fertiliser. It ties the concentrate on 74 points and does not take the top pick, because the concentrate has more reviews.
Pros
Cons
Best for: A small vase of about half a litre when you want a short pack of powder.
Less suitable: A bed or a pot, or a large vase if you expected one sachet to fill it.
Specifications
Common questions
How much water does one sachet make?
One 4 g sachet per 0.5 litre. A review said a large vase needed two.
Is the unit count the whole pack?
No. The unit count is 4.0 gram, which matches one sachet in the bullets, not the pack of 10. The item weight is 50 g.
Who is the manufacturer?
Smithers Oasis. The brand field says floral supplies.
Floralife's 20-pack is listed at about £4.25 with one sachet per 500 ml of water, for a vase and floral foam, not a flower bed. The form field says liquid, the title says water-soluble sachets, and a review received powder. Across 183 amazon.co.uk reviews at 4.4, shop-bought flowers lasted longer than usual for some people, roses perked up, and one bunch was still going after two weeks. Another reviewer followed the instructions, then saw decay and foul water, and thought plain water looked better afterwards. The unit count and liquid volume say 500 ml, while the pack is 20 sachets and the item weight is 90 g. Country of origin is the United Kingdom. The title spelling Cystal and Soluable is as printed on the listing.
Pros
Cons
Best for: Household bunches and floral foam when you accept that the parcel may be powder.
Less suitable: A soil feed, or anyone who needs the form field and the parcel to match.
Specifications
Common questions
Is this a liquid?
The form field says liquid. The title says water-soluble sachets, and a review received powder.
How much water is one sachet for?
One sachet per 500 ml of water.
Can you put it on a flower bed?
No. It is for a vase and floral foam, not a bed fertiliser.
Ten amazon.co.uk listings were scored from the stored pages and the review lines saved with them. Shelf date 21 October 2026. There is no laboratory test. Shelf price is not inside the score. It decides the best value on its own: the lowest shelf price among listings that state how to use the pack and have no unit-count clash. Sachets with a weight or count clash, and the pour-and-feed whose spec does not say whether to dilute, stay out of that price comparison. The highest score is the top pick. If two listings share that score, the higher amazon.co.uk review count takes it. The weights below sum to 100. Neither result means the best flower fertiliser in the UK.
UK buyer evidence
40%Start from the amazon.co.uk star rating, then the size of that review file. A repeated use complaint in the saved notes, such as a short fill, a litre that runs out, caked powder, slow dissolve, cloudy or foul water, a damaged tub, a form mismatch, or a picture that did not match, is a deduction. A plant dying, a tub emptying on delivery, or a form that does not match the title, is a further deduction.
Followable instruction
35%A numeric vase yield in the bullets, with the form matching a powder or sachet, scores highest. An explicit no-dilution or no-mixing line scores next. A season or a 4-to-6-week interval with no grams scores lower. Mix with water, and a blank ratio field, scores lower still. A silent spec, or reviews that contradict a missing dilution line, scores low. A printed 500 ml dose whose form field says liquid is capped.
Named plants and place
15%Azalea, camellia and rhododendron score highest. A vase stated as not soil scores next. Flowers plus vegetables, or garden and indoor houseplants, sit in the middle. The word plants alone, with the place missing from the spec, scores low.
Listing consistency
10%No pack conflict scores high. A mixing-ratio field that is not a dilution, a 20:20:20 field that is not a declared analysis, or a brand field that is not the manufacturer, is a smaller deduction. A unit count or item weight that clashes with the title scores low. A form clash plus a unit count that is a volume rather than the pack scores lower.
Match the job first: soil feed, ericaceous granules, or a vase sachet. Then check dilution, the declared analysis, the season, and whether the pack weight agrees with the title.
Flowers fertiliser on amazon.co.uk is three purchases, not one. You match the job before you match the price. A soil feed is for ordinary flowering plants in pots, baskets and borders. An ericaceous feed is for azaleas, camellias, rhododendrons and similar lime-hating shrubs. A sachet is for cut stems in a vase. A vase sachet does not feed a border, and a soil fertiliser does not go in the water.
Garden feed in a vase, or a sachet on a bed, does not do the other job. Ericaceous granules are for lime-hating shrubs, not for ordinary bedding.
Diluting a ready-to-use bottle, or pouring a concentrate neat, wastes the pack or burns the compost. The highlight or the bullets have to say which one you have.
The Topline mixing-ratio field is not a declared analysis. Classic Growmore percentages apply only when the pack prints them. Do not feed camellias after the end of July, and do not leave a split tub in the rain.
Vase sachets do not feed a border. Soil fertiliser does not go in a vase. Ericaceous granules are for azaleas, camellias, rhododendrons and similar lime-hating plants. Ordinary pots, baskets and border flowers take an all-purpose liquid or a multipurpose garden granule. A coated ericaceous granule is a spring application, not a weekly capful, and it is not a vase powder.
A ready-to-use bottle is poured on. A concentrate is mixed with water. Do not start a general feed after September, and do not feed camellias after the end of July. Check the form, the weight and the count. A form field that says liquid while a review received powder, a 900 g title with a 770 g item weight, or a 4 g item weight on a 50-sachet pack, is a reason to read the listing again before you pay. An 8 kg tub is for a bed you can store it beside, not for a few pots.
Three typical situations, each with a recommendation from this comparison.
If you will not measure a cap, buy a pour-and-feed bottle and accept that a litre runs out faster than a concentrate. Baby Bio Pour & Feed is 1 litre at about £5.81, with 4.5 from 1,365 reviews. The highlight says no dilution is required. The outdoor-plants question on the listing is unanswered.
Lime-hating shrubs need an ericaceous feed, an acid compost and, in a hard-water area, rainwater. Miracle-Gro azalea, camellia and rhododendron granules are about £8.10, with 4.6 from 785 reviews. The listing says no mixing, and one spring application is claimed for the season. The title does not state the pack weight. The item weight is 900 g.
If you only buy bunches, you need a sachet for the vase, not an 8 kg tub. Oasis Floralife, 10 sachets, is about £3.69. The bullets say one 4 g sachet makes 0.5 litre, with no extra measuring. amazon.co.uk shows 4.4 from 349 reviews. A large vase needed two sachets in one review.
The top pick is Miracle-Gro All Purpose concentrate, two 800 ml bottles at about £7.98. It scores 74, tied with the Oasis Floralife 10-sachet pack, and amazon.co.uk shows 4.6 from 3,025 reviews against 4.4 from 349, so the concentrate takes the top pick. The bullets say mix with water. The mixing-ratio field is blank. The best value is Baby Bio Pour & Feed, 1 litre at about £5.81, because that is the lowest shelf price among listings that state how to use the pack and do not clash on pack size. The highlight says no dilution is required. Reviews still say the litre runs out faster than a concentrate. Neither result is the best flower fertiliser in the UK, and neither is a flowering trial.
Miracle-Gro All Purpose concentrate, 2 x 800 ml
Highest score, 74, tied with the 10-sachet vase food; 4.6 from 3,025 reviews takes the top pick. Mix with water. The ratio field is blank. About £7.98.
Baby Bio Pour & Feed, 1 litre
Lowest shelf price among listings that state how to use the pack and have no pack clash, about £5.81. The highlight says no dilution.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK and maker sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the ten amazon.co.uk listings captured on 19 October 2026. Scores use the method dated 21 October 2026. This is not a laboratory test. An analysis on a maker label is that label, not a figure the amazon bullets always repeat. The 2026 consultation on UK Fertilising Product Regulations is not law in force.
Expert source (DIY & tools): Lee Burkhill (Garden Ninja) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the listings. This is not a laboratory test.
