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Phalaenopsis fertiliser on a UK kitchen windowsill

Updated: October 2026

The orchid on a UK kitchen sill is usually a Phalaenopsis, a moth orchid in coarse bark. Phalaenopsis fertiliser is a light specialist feed while the plant is growing, a dry crown after watering, and almost no feed in winter. It is not a lawn rate and not a 5 litre mist for one plant. Mixing and vial steps stay on [how to use orchid fertiliser](/hub/fertiliser-soil-and-bark-mulch/orchid-fertiliser/sub/orchid-fertiliser-how-to-use). The ten listings are on the [orchid fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/orchid-fertiliser). Prices are the amazon.co.uk listings from 19 October 2026. This is not a growing trial. A qualifying purchase can earn a commission at no extra cost to you.

The orchid on a UK kitchen sill is usually a Phalaenopsis, a moth orchid in coarse bark.

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
Growth Technology Orchid Focus Bloom, 100 ml

Alternative

Growth Technology Orchid Focus Bloom, 100 ml
9.0/10about £3.99
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.Why bark holds almost no food
  2. 2.The moth-orchid calendar
  3. 3.Crown, water and ice
  4. 4.What to buy for one moth orchid

Why bark holds almost no food

A moth orchid is an epiphyte. Chunky bark drains fast and stores little nutrient, so a full-strength house-plant feed or a lawn fertiliser is the wrong scale. BBC Gardeners' World says heavy doses kill orchids. The Royal Horticultural Society says use a specific orchid fertiliser lightly. Salts sit on bark chips, which is why a plain-water flush matters here. Topline at about £14.99 is new peat-free bark plus a 175 ml bottle with no rate. UK Grow at about £19.95 feeds leaves, not the bark column. Picks are on best orchid fertiliser. The checks are on the orchid fertiliser buying guide.

The moth-orchid calendar

When the label is silent, the RHS default is a light specialist feed while the plant grows, plain water every fourth watering, and spare or no feed in winter. OSGB says wait for silvery roots, drain the crown, and use no ice cubes. A moth orchid above a radiator is not a cold-rest Cymbidium. Bloom worded for every Phalaenopsis stage is brand wording the amazon bullets do not reprint. In winter, pull a drip vial out.
Westland Westland orchid plant feed concentrate, 200 ml

Testsieger

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

Crown, water and ice

Water or feed left in the crown rots more supermarket moth orchids than a missed feed. Drain the pot, then blot with kitchen paper after a drench, a drip or a mist. OSGB says no ice cubes. Use room-temperature water, and push a tube into the bark, not the leaf joint. If the crown is already black and wet, or roots are mush and you do not know what to cut, stop feeding. A swallowed dose is NHS 111 or a vet.

What to buy for one moth orchid

If you will measure, Westland 200 ml at about £7.58, 4.6 from 519 reviews, is the single jug if you will not switch Grow and Bloom. Water first. Reviews warn of root burn on a dry mix. Focus Grow at about £3.35 and Bloom at about £3.99 print 5 ml in 2 litres and no urea. The bottle you hold wins if another Growth Technology page prints a different rate. A drip is a compromise for one plant. Baby Bio's four-pack at about £8.50 is closer to one windowsill than Doff's ten-pack. Skip the 5 litre mist, skip Topline unless the bark is spent, and skip Vitax if you needed a printed dose.

Common questions

Does a moth orchid need a specialist feed?
The RHS moth-orchid guide says to use a specific orchid fertiliser, lightly, in the growing season. Bark holds little nutrient, so a light specialist feed is ordinary care while the plant is growing. A full-strength house-plant or lawn feed is the usual way people burn roots. Follow the label on the orchid pack you hold.
How often should you feed a Phalaenopsis in the growing season?
Use the season rule on the bottle you hold. If the label is silent, the RHS default is a light feed and plain water every fourth watering. Love Orchids treats feed as optional and roughly monthly. BBC Gardeners' World talks about a weekly generic feed at reduced strength. Do not merge those calendars.
Should you feed in a UK winter?
The RHS says spare or none. If the plant has stopped making roots and days are short, leave the bottle on the shelf. A moth orchid still growing on a warm sill is not a cold-rest Cymbidium, and that is not a licence to keep the summer dose. Pull drip vials in a rest. Bloom feed does not create a winter spike.
Why does bark change the feed job?
Chunky bark drains fast and stores little nutrient, so you feed lightly and you flush salts. It also lets a drip vial run through or miss the roots. That is why a measured jug is the clearer tool for one moth orchid, and why you look at a new vial the next morning.
Can you leave water in the crown after a feed?
No. Drain the pot and blot the crown. Feed in the centre is as harmful as plain water in the centre. The same rule applies to a foliar mist. Ice cubes are not a workaround. OSGB says not to use them.
Is Orchid Focus Bloom the moth-orchid bottle?
On Growth Technology's own pages, Bloom is worded for Phalaenopsis at all stages and Grow for vegetative periods of other genera. The amazon.co.uk bullets do not reprint that split. They print 5 ml in 2 litres and no urea on both. Treat Bloom as brand wording, not as a tested spike-maker. Westland 200 ml is the single bottle if you will not switch.
Should one moth orchid buy a 5 litre mist?
No, not as the first feed. UK Grow's 5 litre bottle is a ready foliar refill at about £19.95 for someone who already decants a weekly spray. It does not include a sprayer, and several UK texts cannot open the cap. A 100 ml or 200 ml concentrate matches one windowsill plant.
When do you call for help instead of buying more feed?
Call for help when the crown is black and wet, or when roots are mush and you do not know what to cut. More fertiliser will not repair rot. If a child or a pet swallows the liquid, use NHS 111 or a vet. These listings are not pesticides.

Related pages

Drip feeder versus concentrate

Orchid fertiliser

Best orchid fertiliser for your UK windowsill habit

Orchid fertiliser buying guide for a UK 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)