Independent comparisons. We may earn from shop links. More info

Best hydrangea fertiliser UK by the job, not the stars

Updated: October 2026

You are comparing amazon.co.uk listings, and a 4.4 from 1,741 reviews is sitting next to a 5.0 from a single review. Those are not the same kind of evidence, and a colourant tub is not a bag of feed. This page says which kept listing fits which job, and who should skip it. The [hydrangea fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/hydrangea-fertiliser) holds the full rows. Prices are the 19 October 2026 captures. We keep Westland colourant at £6.99 and 4.2 from 1,244. No lab trial. A qualifying purchase can earn a commission at no extra cost to you.

You are comparing amazon.co.uk listings, and a 4.4 from 1,741 reviews is sitting next to a 5.0 from a single review. Those are not the same kind of evidence, and a colourant tub is not a bag of feed.

Our top picks

Topline Topline hydrangea liquid plant food, 2 x 1 litre

Best overall

Topline Topline hydrangea liquid plant food, 2 x 1 litre
9.4/10about £16.99
View offer
Vitax Ltd Vitax hydrangea feed granules, 2 x 1 kg

Rank 2

Vitax Ltd Vitax hydrangea feed granules, 2 x 1 kg
9.8/10about £11.98
View offer
Westland Westland hydrangea colourant, 500 g

Best value

Westland Westland hydrangea colourant, 500 g
9.4/10about £6.99
View offer
On this page
  1. 1.There is no single best hydrangea fertiliser here
  2. 2.If you want a feed
  3. 3.If you want blue
  4. 4.If you want both in one order
  5. 5.Who should skip a purchase

There is no single best hydrangea fertiliser here

A feed and a colourant cannot share one winner. Scoring a 5.0 from one review above a 4.4 from 1,741 would treat a two-word comment as a British ranking. We do not. The RHS still says regular feeding is often unnecessary. If you are not sure you should buy at all, use the hydrangea fertiliser buying guide before this shortlist.

If you want a feed

The Vitax granules, two 1 kg bags at £11.98, have the largest UK sample: 4.4 from 1,741 reviews. The bullets name magnesium and iron and do not claim a pink-to-blue change. The amazon page prints no NPK. The manufacturer label does: NPK 8-4-12, and a line that the feed does not change colour. Skip it for blue. The grams are on how to use hydrangea fertiliser. Topline liquid is two 1 litre bottles at £16.99, 4.7 from 68 reviews. The bullets say feed weekly and also a spring top dressing. No NPK is printed. The mixing-ratio field reads 1:0:0. Neudorff Azet is 1 kg at £12.99, 4.0 from four reviews marked Spain, with an organic-cultivation bullet and no certifier. The Vitax powder titled 1KG (6) is £39.29. The unit count is 1000 gram, and the file does not confirm six kilograms.
Topline Topline hydrangea liquid plant food, 2 x 1 litre

Testsieger

Topline Topline hydrangea liquid plant food, 2 x 1 litre
9.4/10about £16.99
View offer

If you want blue

Westland’s colourant, model 20600082, is titled 500 g at £6.99, with 4.2 from 1,244 reviews and an item weight of 440 g. The form line says Liquid. Review bodies describe powder in a card tube, crushed tubes, and one plant nearly killed at the pack amount. The manufacturer page adds an eye-damage warning and about 93 percent aluminium sulphate. Skip it for a white, panicle, or smooth hydrangea. Vitax colourant is 500 g at £8.48, model 566646, 4.4 from 950 reviews. Pale pink is what the bullets say tends to blue best. The mix is about 15.3 percent aluminium sulphate, and it still carries an eye warning. One tub was reported contaminated with peppercorns, leaves, and twigs. gifyym is £5.16, 5.0 from one review that says Good product. The generic aluminium sulphate is £5.30, 4.8 from seven reviews, origin China, title 100 g against 119 g. A star of 5.0 does not make the smaller tub the stronger buy.

If you want both in one order

Buy a bundle only when you already want nutrients and a colour attempt. Topline’s is 1 litre of Westland liquid plus 500 g of colourant at £16.99, 4.5 from 74 reviews, with no NPK. One UK body describes powder leaving a damaged pack. Westland’s own bundle is the same sizes at £15.69, and the number of items line is 1 while the title names two products. Vitax granules at £11.98 plus Westland colourant at £6.99 cost more than either bundle. Skip a bundle for one job. The two jobs are on hydrangea feed vs colourant.

Who should skip a purchase

Skip every listing if the shrub is healthy and you are not changing colour. Skip a colourant for a white, red, green, panicle, or smooth hydrangea. Skip a feed if your only goal is blue. Skip the £39.29 title if the pack size is unclear, and the £5 powders if you wanted a named UK brand with a hazard line.

Common questions

Which listing has the most reviews?
The Vitax granule feed, two 1 kg bags at £11.98, has 4.4 from 1,741 reviews. It is a feed, not a colourant. Westland colourant is next among the blueing tubs, at 4.2 from 1,244. A bigger file is not a reason to feed a healthy shrub.
Which colourant should I buy if I want a known brand?
Westland at £6.99 has the larger review file and the lower shelf price. Vitax at £8.48 has a slightly higher star line and fewer notes about crushed tubes. The £5.16 and £5.30 powders are not that branded pair.
Is the £5.16 tub a better score because it is 5.0?
No. That line is one review, and the text is Good product. A 4.2 from 1,244 reviews tells you more about leaks, lids, and colour shifts than a perfect star with no description. We do not treat the single 5.0 as the best hydrangea fertiliser in the UK.
Who is the Vitax 2 × 1 kg pack for?
A spring top dressing or planting, when you want magnesium and iron named and a large UK review file. Skip it for a colour change. The grams are on the Vitax label, which says the feed does not change colour.
Who should skip the £39.29 Vitax title?
Anyone who has not confirmed what 1KG (6) means. The unit count is 1000 gram, there is one review and no review text, and there are no bullets and no dose. It is not a confirmed six-kilogram pack, and it is a poor stand-in for the 2 kg granule listing at £11.98.
Is Neudorff the organic option?
It is the only listing here whose bullets say organic cultivation and pet-friendly. No certifier is named. The star line is 4.0 from four reviews, and both bodies are marked Spain. Treat the organic line as a seller claim, not as a UK inspection result.
Do I need the best feed if the RHS says not to feed?
No. If the shrub is healthy and you are not chasing colour, buy none of these. A high review count does not create a weekly feeding duty.

Related pages

How to turn hydrangeas blue

Hydrangea fertiliser

Hydrangea fertiliser buying guide: feed, colour or none

Hydrangea feed versus colourant: nutrients, blue, or both

How to use hydrangea fertiliser: rates and when to stop

Sources

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 follow the 21 October 2026 shelf note. The NPK 8-4-12 line is the Vitax label, and it is not printed in the amazon bullets. Aluminium percentages and the eye-damage class are from the maker sheets named below, not from an amazon bullet. The March 2026 GOV.UK item was a consultation, not a shopping rule.

  1. RHS, shrubby hydrangea growing guide (retrieved 19 October 2026)
  2. RHS, acidifying soil (retrieved 19 October 2026)
  3. RHS, soil pH (retrieved 19 October 2026)
  4. Agriculture Act 1970, section 68 (retrieved 19 October 2026)
  5. Fertilisers Regulations 1991 (retrieved 19 October 2026)
  6. GOV.UK, new fertiliser regulations, 19 March 2026 (retrieved 19 October 2026)
  7. Vitax Hydrangea Feed label (retrieved 19 October 2026)
  8. Westland Hydrangea Colourant (retrieved 19 October 2026)
  9. Westland Hydrangea Colourant safety data sheet (retrieved 19 October 2026)