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Christmas cactus fertiliser

Updated: October 2026

The plant on the kitchen shelf flowered around Christmas, and you have been treating it like the spiny cactus in the hall. A Christmas cactus fertiliser question is a calendar question. Schlumbergera is a forest cactus. It wants a liquid feed from April to the end of September, then a cooler rest so it can set buds, and it should not sit bone-dry all winter. Sugar stirred into the watering can is not that feed. Packs and prices stay on the [cactus fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/cactus-fertiliser). Desert-cactus steps stay on [how to feed a cactus](/hub/fertiliser-soil-and-bark-mulch/cactus-fertiliser/sub/cactus-fertiliser-how-to-feed). Products Compared checked the Royal Horticultural Society, BBC Gardeners’ World and Ideal Home on 19 October 2026.

The plant on the kitchen shelf flowered around Christmas, and you have been treating it like the spiny cactus in the hall. A Christmas cactus fertiliser question is a calendar question. Schlumbergera is a forest cactus.

Our top picks

Baby Bio Baby Bio cactus food, 175 ml

Best overall

Baby Bio Baby Bio cactus food, 175 ml
9.4/10about £3.99
View offer
Topline Topline compost and cactus feed bundle

Alternative

Topline Topline compost and cactus feed bundle
7.7/10about £13.99
View offer
FITO FITO cactus drip feeder, 32 ml

Best value

FITO FITO cactus drip feeder, 32 ml
8.3/10about £3.61
View offer
On this page
  1. 1.A forest cactus, not a desert one
  2. 2.When to feed and when to pause
  3. 3.Sugar water is not a fertiliser
  4. 4.Which bottles in this set name it

A forest cactus, not a desert one

Schlumbergera is an epiphyte, so a British windowsill still wants a different year from a Mammillaria. The RHS says a Christmas cactus needs warmth and regular water in winter, and a rest in summer, unlike most desert cacti. Two cool rests, about 12°C, come after flowering and again in September. BBC Gardeners’ World draws the same line. In January the desert cactus is almost dry and unfed. The Christmas cactus is just moist and unfed, not left to dust. Copy the desert rest and buds fail because the compost dried out. Copy winter watering onto a desert cactus and you risk rot.

When to feed and when to pause

The RHS says a liquid houseplant feed from April to the end of September. BBC Gardeners’ World says monthly in spring or summer with a general fertiliser. Stop before you want buds. The first rest runs from mid-September until the buds are set, about 12–15°C. The second runs from late January to late March. Compost stays slightly moist, not waterlogged and not bone-dry. Early September is the last dilute feed. Do not open the bottle at Christmas because the flowers are out. Start again in April. Do not copy the desert drought of November to March.
Baby Bio Baby Bio cactus food, 175 ml

Testsieger

Baby Bio Baby Bio cactus food, 175 ml
9.4/10about £3.99
View offer

Sugar water is not a fertiliser

Ideal Home asked UK retailers and florists, and the answer was no. Arena Flowers, Beards & Daisies, and British Garden Centres describe sugar blocking nutrient uptake, drawing water out of the roots, and inviting mould. Sugar is not nitrogen, phosphorus, or potassium. A 10-10-10 figure beside that advice is not printed on the amazon.co.uk listings here, so do not copy it onto a bottle. If you have already poured sugar water, flush with plain water, empty the saucer, and do not feed the same afternoon.

Which bottles in this set name it

Two listings name Christmas cacti. Baby Bio cactus food does. The Topline feed bullet does. You can share the bottle with a Mammillaria and you still change the calendar. The Christmas cactus is fed only until the end of September, then kept slightly moist and cooler. COMPO review texts mention a Christmas cactus. That is a reviewer, not the UK bullet list, and many of those Amazon reviews are German. In the Amazon reviews, one UK note says the Topline compost turns to sludge, and the feed field is not a usable dose. A conditional bottle is on the best cactus fertiliser page. Dose checks are on the cactus fertiliser buying guide.

Common questions

When do you feed a Christmas cactus in the UK?
Feed from April to the end of September. The RHS specifies a liquid houseplant feed across that stretch. BBC Gardeners’ World says monthly in spring or summer with a general fertiliser. Stop at the end of September so the plant can rest before the buds. Do not feed on Christmas Day because the plant is in flower. Flowering is the point of the earlier rest, not a signal to open the bottle. The next feed waits until growth starts again in spring.
When do you stop so it can set buds?
Stop feeding from mid-September and keep the plant cooler, about 12–15°C, until the buds show. The RHS calls that the first rest. A second rest runs from late January to late March. Through both, the compost should not dry out completely and should not sit in water. A desert cactus stopped across the same months is on a much drier regime. Do not use that drought on a Schlumbergera if you want the buds to stay on the plant.
Is sugar water a fertiliser?
Sugar water is not a fertiliser. Ideal Home reports that UK florists and retailers, including Arena Flowers, Beards & Daisies, and British Garden Centres, reject it for Christmas cacti. Sugar can interfere with nutrient uptake, pull water from the roots, and encourage mould. Use a dilute houseplant or cactus feed in the growing months, then pause. The 10-10-10 figure mentioned beside that advice is not an analysis from the amazon.co.uk listings in this set, so do not mix to that ratio unless your own label prints it.
How is this rest different from a desert cactus?
A desert cactus, on the RHS growing guide, rests from November to early March with little water and no feed. A Christmas cactus is kept slightly moist through its cool rests and is not left bone-dry. It also needs an autumn pause so buds can form, and the general cactus guide notes a summer rest that desert plants do not share. The two plants can share a windowsill and should not share a winter. Feed each one only in its own growing window.
Should you mist a Christmas cactus?
BBC Gardeners’ World says you can mist a Christmas cactus a few times a week, or stand it on a pebble tray, as long as the compost is not waterlogged. That advice is for this forest cactus, with its flattened stems. It is not advice to mist a desert cactus. If buds are forming, a steady cool spot matters more than chasing humidity. Misting does not replace the feed you give from April to the end of September, and it does not repair a pot that has dried out.

Related pages

Cactus fertiliser comparison

How to feed a cactus

Best cactus fertiliser

Cactus fertiliser buying guide

Cactus fertiliser liquid or granules: which to buy

Sources

Public UK 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. An NPK on a retailer page is not the amazon listing analysis. A pet-safety bullet is a listing claim. There is no laboratory test in this comparison.

  1. RHS, How to grow cacti and succulents (retrieved 19 October 2026)
  2. RHS, How to feed plants (retrieved 19 October 2026)
  3. RHS, How to grow Christmas cactus (retrieved 19 October 2026)
  4. RHS, Fertiliser labels explained (retrieved 19 October 2026)
  5. BCSS, The growing year (retrieved 19 October 2026)
  6. GOV.UK, Manufacturing and marketing fertilisers (retrieved 19 October 2026)
  7. The Fertilisers Regulations 1991 (retrieved 19 October 2026)
  8. ASDA, Baby Bio Cactus Food 175 ml (retrieved 19 October 2026)
  9. Ideal Home, Christmas cactus and sugar water (retrieved 19 October 2026)