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Cut flower food

Updated: October 2026

The roses are already in the jug, and the only packet in the drawer is either a tiny sachet or a bottle meant for a flower bed. Cut flower food is the sachet dissolved in vase water. It is not an 8 kg tub, and it is not Baby Bio. One sachet in this set often makes only 0.5 litre, so a tall vase can need two. Prices recorded on 19 October 2026, and the wider table, are on the [flower fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/flowers-fertiliser). A qualifying purchase can earn us a commission at no extra cost to you.

The roses are already in the jug, and the only packet in the drawer is either a tiny sachet or a bottle meant for a flower bed. Cut flower food is the sachet dissolved in vase water.

Our top picks

Fleur vital Fleur vital cut-flower sachets, 50 pack

Best overall

Fleur vital Fleur vital cut-flower sachets, 50 pack
6.0/10about £5.75
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Floral supplies Oasis Floralife sachets, 10 pack

Alternative

Floral supplies Oasis Floralife sachets, 10 pack
7.4/10about £3.69
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Floralife crystal clear Floralife flower-food sachets, 20 pack

Alternative

Floralife crystal clear Floralife flower-food sachets, 20 pack
5.5/10about £4.25
View offer
On this page
  1. 1.Not the garden bottle
  2. 2.Half a litre, then stop
  3. 3.What the four listings actually say
  4. 4.Cloudy water

Not the garden bottle

A sachet is for water that has no soil in it, around stems that are no longer attached to a root. The Royal Horticultural Society's conditioning advice starts with a clean vase, cut-flower food in the water, and a recut every few days. If you pour Miracle-Gro or Baby Bio into the jug, you are using the wrong product. The same refusal covers Topline granules. Sugar on its own feeds bacteria in the vase, which is why Interflora does not treat sugar as a substitute for flower food. If you are still deciding whether you needed a sachet, the flower fertiliser buying guide is the three-way split.

Half a litre, then stop

The Oasis Floralife 10-pack at £3.69 states the yield in the bullets. Each sachet is 4 g and makes 0.5 litre. A review said a large vase needed two. If the jug holds a litre or more, use a second sachet. Floralife's 20-pack, at £4.25, also states one sachet per 500 ml. The 100-pack's bullets do not state millilitres, while a side field says 1 litre.
Fleur vital Fleur vital cut-flower sachets, 50 pack

Testsieger

Fleur vital Fleur vital cut-flower sachets, 50 pack
6.0/10about £5.75
View offer

What the four listings actually say

The 10-pack unit count is 4.0 gram, which matches one sachet, not the ten you think you bought. The brand field says floral supplies and the manufacturer is Smithers Oasis. The 20-pack form field says liquid. A review received powder. The unit count is 500 ml, not 20. The title spelling Cystal and Soluable is as the listing prints it. Fleur vital is 50 sachets at £5.75, and the item weight of 4 g is not plausible for that pack. The best flower fertiliser by job page points at the 10-pack.

Cloudy water

Food is not a substitute for a clean vase. The Royal Horticultural Society says to change the water and recut the stems every two to four days, and to keep the vase away from heat and ripe fruit. It does not make every bunch last a fixed number of days. In the Amazon reviews, Fleur vital buyers saw water go thick and cloudy. If a sachet makes the water worse, tip it out, wash the vase, and recut. Nothing on this page feeds a plant that is still in a pot. Use the how to feed flowers page for soil packs.

Common questions

Can I put Baby Bio or Miracle-Gro in the vase?
No. Those bottles are soil feeds for growing plants. Baby Bio is a ready-to-use pour-on, and the Miracle-Gro concentrate is mixed for compost. Neither is cut-flower food. Use a sachet in the vase water, and keep garden granules out of the jug as well.
How much water is one sachet for?
Where the listing states it, about 0.5 litre. The Oasis 10-pack says one 4 g sachet per 0.5 litre. The Floralife 20-pack says one sachet per 500 ml. Fleur vital's liquid-volume field says 0.5 litres, without the steps in the bullets. The 100-pack does not state millilitres in the bullets; a side field says 1 litre, so do not treat that as the same dose.
What if the vase is larger than 0.5 litre?
Use a second sachet rather than stretching one across a litre or more. A review of the 10-pack said a large vase needed two. Do not keep adding packets until the water is thick. If you are unsure of the volume, fill the vase to the usual level once with a measuring jug and note it.
Why did the water go cloudy or thick?
It happens in the reviews, including thick water with Fleur vital and foul water with a Floralife sachet used as instructed. Flower food is meant to help keep water cleaner, and it does not always do that in a particular jug. Change the water, wash the vase, and recut. If it happens again, use plain clean water instead of another sachet that day.
Is the Floralife listing a liquid?
The 20-pack's form field says liquid. The title says water-soluble sachets, and a review received powder. Treat the parcel as powder unless the pack in your hand is obviously a bottle. The trade liquid concentrate sold in 5 litre and 10 litre sizes is a different product, dosed at 10 ml per litre, and it is not this amazon listing.
How often should I change the water?
Every two to four days, on the Royal Horticultural Society's conditioning advice, and sooner if the water is already cloudy. Recut the stems at the same time. Topping up a stale jug is not the same as changing it. One reviewer renewed sachet food every two or three days and was happier with the stems than they had expected.
Does flower food replace recutting the stems?
No. The Society still wants a recut on that two-to-four-day cycle, a clean vase, and the bunch kept away from heat and ripe fruit. Food helps the water. It does not repair a stem that has sealed over, and it does not promise a week or two of life for every bunch you bring home.

Related pages

Flower fertiliser buying guide

Best flower fertiliser by job

How to feed flowers

Flowers fertiliser

Ericaceous fertiliser for azaleas and rhododendrons

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 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.

  1. RHS, fertilisers (retrieved 19 October 2026)
  2. RHS, feeding plants (retrieved 19 October 2026)
  3. RHS, conditioning cut flowers (retrieved 19 October 2026)
  4. RHS, growing camellias (retrieved 19 October 2026)
  5. Fertilisers Regulations 1991, legislation.gov.uk (retrieved 19 October 2026)
  6. GOV.UK, manufacturing and marketing fertilisers (retrieved 19 October 2026)
  7. Miracle-Gro all purpose concentrate label (retrieved 19 October 2026)
  8. Miracle-Gro azalea, camellia and rhododendron label (retrieved 19 October 2026)