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Orchid fertiliser buying guide for a UK windowsill

Updated: October 2026

You have a moth orchid on a UK windowsill and bottles that all say orchid: a concentrate, a vial, a 5 litre mist, or compost with a small feed bottle attached. An orchid fertiliser buying guide is the checklist before you pay, not a medal table. The ten amazon.co.uk listings are on the [orchid fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/orchid-fertiliser). This page stays on form, a dose you can follow, the claims on that listing, and the pack. Prices and stars are from 19 October 2026. This is not a laboratory test. A qualifying purchase can earn a commission at no extra cost to you.

You have a moth orchid on a UK windowsill and bottles that all say orchid: a concentrate, a vial, a 5 litre mist, or compost with a small feed bottle attached.

Our top picks

Westland Westland orchid plant feed concentrate, 200 ml

Best overall

Westland Westland orchid plant feed concentrate, 200 ml
9.2/10about £7.58
View offer
Doff Doff orchid drip feed, 10 × 30 ml

Alternative

Doff Doff orchid drip feed, 10 × 30 ml
9.0/10about £6.01
View offer
Growth Technology Orchid Focus Grow, 100 ml

Best value

Growth Technology Orchid Focus Grow, 100 ml
8.6/10about £3.35
View offer
On this page
  1. 1.Four checks before you pay
  2. 2.What a usable dose looks like
  3. 3.Analysis without a lab test
  4. 4.Packs, bundles and stars

Four checks before you pay

Start with the job, not the brand. A concentrate is measured into water and poured through bark. A drip is a ready vial. A mist goes on the leaves. A bark bundle is compost plus a bottle. About £19.95 of mist is not a stronger drench than about £3.35 of concentrate. Focus Grow and Bloom print 5 ml in 2 litres. Westland's 200 ml bottle shows a squeeze top and mixing field 1:5. The 5 ml in 1 litre line is on the brand page, not this amazon.co.uk listing. Only the Focus bullets state no urea. The Royal Horticultural Society expects a name, NPK, nitrogen form, manufacturer and weight on a fertiliser.

What a usable dose looks like

A usable dose names a volume of feed and a volume of water. A 15-day line is a calendar. Mixing field 1:0:0 is a catalogue token. Reviewers fill Westland's squeeze top, and one text calls that a 5 ml line, while the listing still records 1:5. Other Growth Technology pages state 5 ml per litre. The bottle you hold wins. Vitax, at 3.7 from three ratings, has no dose and no review texts. Topline's 175 ml bottle has the same gap. The sink steps are on how to use orchid fertiliser.
Westland Westland orchid plant feed concentrate, 200 ml

Testsieger

Westland Westland orchid plant feed concentrate, 200 ml
9.2/10about £7.58
View offer

Analysis without a lab test

Westland's NPK 6-3-6 is on the brand page, not the amazon listing. Focus names high nitrogen or higher phosphorus and potassium, plus no urea, which is not a full analysis. A HortTechnology note that nitrate suits Phalaenopsis does not travel to the other eight listings. GOV.UK and the Fertilisers Regulations 1991 say how a declared fertiliser should read. They do not invent a rate for 1:0:0. Doff's 4.5 from 1,972 and Westland's 4.6 from 519 are listing statistics, and both samples include complaints.

Packs, bundles and stars

Under £6: Focus Grow at about £3.35, Focus Bloom at about £3.99, and Westland droplets at about £5.20. Then Doff, the Westland concentrate, Vitax, Baby Bio and ZOPPER. Topline is about £14.99 and the UK Grow mist is about £19.95. Westland droplets print 640 ml against 4 × 40 ml. Baby Bio prints 40 ml against a four-pack. ZOPPER prints a unit count of 1 against a 10-pack. Buy the titled pack. A habit pick is on best orchid fertiliser. The vial against the jug is on orchid drip feeder versus concentrate.

Common questions

What should you check on an orchid fertiliser before you buy it?
Check the form first: concentrate, drip vial, foliar mist, or a bark-plus-feed bundle. Then look for a dose you can copy, such as 5 ml in 2 litres, and treat 1:0:0 as not a dose. Read only the claims on that listing. Last, match the pack to the job, because 100 ml, 5 litres of mist and 10 litres of bark are not the same purchase.
Does a usable dose have to be printed as millilitres in a litre?
A usable dose names a volume of feed and a volume of water. The clearest printed line here is 5 ml in 2 litres on both Orchid Focus bottles. Westland's 5 ml in 1 litre sentence is on the brand page, not this amazon.co.uk listing. A 15-day or 30-day vial claim is a calendar, not a mix rate.
Is a mixing field of 1:0:0 a dose?
No. On Doff, ZOPPER, Baby Bio and the UK Grow mist, 1:0:0 is a catalogue token, not one part feed to zero parts water. Those products are sold ready to use. If you need a millilitre recipe, look at Orchid Focus or at the label on the Westland 200 ml bottle you hold.
Should you treat a retailer NPK as the amazon listing analysis?
No. Westland publishes NPK 6-3-6 on its brand page. The amazon.co.uk listing for the 200 ml bottle does not print the triple. Quote the brand page as a brand page. Do not paste 6-3-6, or a no-urea line, onto a silent row.
Is a 5 litre mist the same job as a 100 ml concentrate?
No. UK Grow's 5 litre bottle is a ready foliar refill with a weekly spray claimed, and it does not include a spray bottle. Orchid Focus 100 ml is a root drench you dilute. The higher sticker buys volume of spray, not a stronger drench for one moth orchid.
Why does a compost-and-feed bundle need judging twice?
Topline is 10 litres of peat-free pine-bark compost plus a 175 ml flower-food bottle with no printed mix rate. The bark is potting medium. The bottle is the fertiliser. Do not treat about £14.99 as proof the feed is stronger than a small concentrate.
Can you treat 15-day or 30-day vial claims as a fact?
No. Doff says replace every 15 days. Westland droplets claim 4 weeks. Baby Bio claims up to 30 days. ZOPPER claims 15 days per vial. Saved UK texts often say the vial emptied in a day, did not drip, or blocked. Check the next morning, and keep watering. The claim is what the box printed.

Related pages

Phalaenopsis orchid fertiliser

Orchid fertiliser

Best orchid fertiliser for your UK windowsill habit

Orchid drip feeder versus concentrate on a windowsill

How to use orchid fertiliser: mix, flush and crown

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. A drip duration is a listing claim. A no-urea line is recorded only where the bullets say it. Westland's NPK is from the maker's page, not from the amazon listing. This is not a laboratory test.

  1. RHS, how to grow Phalaenopsis (retrieved 19 October 2026)
  2. RHS, fertiliser labels explained (retrieved 19 October 2026)
  3. RHS, fertilisers: types and uses (retrieved 19 October 2026)
  4. GOV.UK, manufacturing and marketing fertilisers (retrieved 19 October 2026)
  5. Fertilisers Regulations 1991, Schedule 2 (retrieved 19 October 2026)
  6. Westland orchid feed (retrieved 19 October 2026)
  7. Doff orchid drip feed (retrieved 19 October 2026)
  8. Growth Technology, Orchid Focus Grow (retrieved 19 October 2026)