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Houseplant fertiliser buying guide

Updated: October 2026

You have a pothos, a peace lily and a monstera on a UK windowsill, and the amazon.co.uk results are a row of green bottles that all say houseplant food. This houseplant fertiliser buying guide sorts that shelf into concentrate, ready-to-use liquid, all-purpose mix, and the specialist bottles this set does not cover. Prices and review counts for the nine listings live on the [houseplant fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/fertiliser-for-houseplants). The Products Compared editorial team prepared this on 21 October 2026 from those listings. It is not a laboratory trial. A qualifying purchase can earn a commission at no extra cost to you.

You have a pothos, a peace lily and a monstera on a UK windowsill, and the amazon.co.uk results are a row of green bottles that all say houseplant food.

Our top picks

Baby Bio Baby Bio Houseplant Food 175 ml

Best overall

Baby Bio Baby Bio Houseplant Food 175 ml
9.4/10about £3.99
View offer
Baby Bio Baby Bio organic 175 ml

Preis-Tipp

Baby Bio Baby Bio organic 175 ml
9.2/10about £3.99
View offer
Miracle-Gro Miracle-Gro Pour and Feed 1 L

Alternative

Miracle-Gro Miracle-Gro Pour and Feed 1 L
9.0/10about £5.00
View offer
On this page
  1. 1.What you are actually buying
  2. 2.Match the bottle to the plant
  3. 3.Read the label, not the scraped ratio
  4. 4.What this shelf cannot decide

What you are actually buying

A concentrate is a small bottle you dilute. On this shelf the clearest example is the Baby Bio 175 ml indoor concentrate at £3.99, which tells you to add 5–10 drops to half a litre of water and pour that onto the soil. An item highlight says the bottle makes up to 70 litres. That figure is the listing's claim, not a measurement we made in a jug. A ready-to-use bottle is already diluted. Baby Bio Pour & Feed is £5.81 for 1 litre and Miracle-Gro Pour and Feed is £5.00 for 1 litre. The litre on the label is the whole supply. Specialist feed is mostly absent here. The Royal Horticultural Society's feeding page treats orchids as a specialist job. The concentrate or ready to use page stays on that one choice.

Match the bottle to the plant

Foliage plants in active growth are the job this shelf is built for. The RHS feeding guidance is about once or twice a month from March to October, with little use in winter. If the plant is a phalaenopsis, the RHS points you to a specialist orchid feed. Succulents show up in reviews of Houseplant Focus at 5 ml in 1 litre. That is not the RHS cactus window of April to September. Match the plant group first, then the format.
Baby Bio Baby Bio Houseplant Food 175 ml

Testsieger

Baby Bio Baby Bio Houseplant Food 175 ml
9.4/10about £3.99
View offer

Read the label, not the scraped ratio

Amazon's mixing-ratio field is often scrape noise. On the £3.99 Baby Bio concentrate it prints 1:0:0, and the product data treat that string as not a readable NPK. If you mix to 1:0:0 you have not followed a recipe. You have followed an empty field. A real analysis looks like the declaration on the Morrisons page for Baby Bio house plant food, 10.6-4.4-1.7. Westland's own product page states 6-4-7 and sells the doser. The product data do not treat the scraped 6-4-7 field as a confirmed NPK on the amazon page. If a listing has no dose, skip it and use the how to feed houseplants steps only after you are holding a label that states one.

What this shelf cannot decide

This comparison has no feed spikes, no granules, and no bottle whose title is orchid food or cactus food. £6.33 for 175 ml with no dose, and £10.18 for a twin pack whose volumes disagree, sit next to a £3.99 concentrate with a printed drop range and 21,941 reviews. A bottle that cannot tell you how to mix it cannot tell you it is the right one.

Common questions

Is houseplant food different from all-purpose liquid?
Often yes, and sometimes the listing blurs it. A houseplant concentrate such as the £3.99 Baby Bio is listed for indoor plants and a drop dose. Miracle-Gro's 800 ml twin pack is an all-purpose concentrate for indoor houseplants and the garden, with no ratio in the bullets. If you only have windowsill plants, the indoor dose is the closer buy. If you also feed outdoor pots, the all-purpose bottle is the one that says so, though you still have to read the pack for the mix.
Should I buy the small concentrate or the litre pour-on?
Buy the 175 ml concentrate when you have more than a few plants and you will count drops. The listing claims up to 70 litres from that bottle. Buy the 1 litre pour-on when you refuse to measure and you only have a handful of pots. Baby Bio's pour-on is £5.81 and Miracle-Gro's is £5.00, and each litre is already diluted. A ready litre used as if it were concentrate is gone in one afternoon.
What does a high nitrogen number mean for leaves?
Nitrogen is the first figure in an N-P-K line, and leaves use it while they are growing. Morrisons prints 10.6-4.4-1.7 for a Baby Bio house plant food, which is the oxide form of one declaration, not a second recipe beside 10.6-1.9-1.4. A nitrogen-led title does not guarantee greener leaves next week. It also does not override a missing dose. If the amazon field shows 1:0:0, that is not the nitrogen number.
Do orchids use the same bottle?
The RHS treats orchids as a specialist feed, not as a general houseplant drench. A single review that mentions an orchid on a Baby Bio listing is not a label. If your orchid already has a feed, keep that one. Use a foliage bottle for the pothos and the peace lily, and do not copy a monstera schedule onto a moth orchid because both sit on the same windowsill.
Does organic on the title mean a named certifier?
Not in this file. The 175 ml Baby Bio whose title says organic concentrated nitrogen feed does not name a certifier on the listing. You should not read that word as a UK organic certificate. Reviews talk about a strong smell and a bottle that drips. Those are reasons to skip it in a small room, not reasons to treat the title as audited. If you need a scheme name, it is not on this page.

Related pages

Fertiliser for houseplants

Best houseplant food UK: mixed, measured or pour-on

Houseplant feed: concentrate or ready-to-use litre

How to feed houseplants: dose, moisture and season

Feed houseplants in winter: when to pause the bottle

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 nine amazon.co.uk listings captured on 21 October 2026. Listing ratio fields are not treated as NPK. The organic word on one Baby Bio title is not a certifier. A maker analysis is the maker's statement, not an independent UK lab test.

  1. RHS, houseplants growing guide (retrieved 21 October 2026)
  2. RHS, feeding plants (retrieved 21 October 2026)
  3. Gardeners' World, how to feed house plants (retrieved 21 October 2026)
  4. GOV.UK, manufacturing and marketing fertilisers (retrieved 21 October 2026)
  5. Fertilisers Regulations 1991 (retrieved 21 October 2026)
  6. HSE, about pesticides (retrieved 21 October 2026)
  7. Westland Houseplant Feed (retrieved 21 October 2026)
  8. Morrisons, Baby Bio house plant food 175 ml (retrieved 21 October 2026)