Houseplantflowering houseplantSome care needed

Christmas cactus

Schlumbergera × buckleyi

A forest cactus from Brazilian cloud forest, not a desert one, which reverses almost every assumption people bring to it: it wants shade rather than sun, humidity rather than dry air, and regular water in growth. Flowering is triggered by long nights and cool temperatures in autumn.

Position: Bright, out of direct sun
Water: moderate demand
Drainage: Free-draining
Grows to: 25–40 cm × 40–60 cm
Frost: Frost tender
Difficulty: Some care needed

August

Nothing to do

No sowing, planting, harvesting or pruning window falls in August.

Christmas cactus’s year

Resolved for United Kingdom (general). Every window is stored against a climate event rather than a date, so a late frost pocket runs later than the band shows. What else August calls for.

Activity	J	F	M	A	M	J	J	A	S	O	N	D
Take cuttings					May.	June.
Protect										October.	November.

Timing that travels

The band above resolves this plant's windows into months for one region. These are the windows themselves, stored against a climate event rather than a date — which is the form that survives being carried to a colder garden, a frost pocket, or next year.

Conditions it needs

Light: Partial shade, Dappled shade
Frost: Frost tender
Grows best at: 15–24 °C
Soil: Peat-free compost
Soil pH: 5.5–6.5
Drainage: Free-draining
Water needs: moderate
Drought: moderate tolerance
Waterlogging: poor tolerance
Heat: moderate tolerance
Wind and exposure: poor tolerance

Where these figures come from

LightSourced guidancemoderate confidence: Royal Horticultural Society: Christmas cactus — position
Checked 2026-08-13
FrostSourced guidancehigh confidence: Royal Horticultural Society: Christmas cactus — hardiness
Checked 2026-08-13
Grows best atSourced guidancemoderate confidence: Royal Horticultural Society: Christmas cactus — temperature
Checked 2026-08-13
SoilSourced guidancemoderate confidence: Royal Horticultural Society: Christmas cactus — soil
Checked 2026-08-13
Soil pHSourced guidancemoderate confidence: Plant Finder — Missouri Botanical Garden: Schlumbergera — culture
Checked 2026-08-13
DrainageSourced guidancemoderate confidence: Royal Horticultural Society: Christmas cactus — soil
Checked 2026-08-13
Water needsHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
DroughtHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
WaterloggingHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
HeatHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Wind and exposureHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

On your soil

Computed by comparing this plant's recorded requirements against each soil's recorded characteristics. A recorded horticultural fact overrides the comparison where GrowingHQ holds one.

Soil	Verdict	Why
Heavy clay	Works, with one condition	Christmas cactus will crop on heavy clay, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. For a crop lifted before winter the risk is not rot but the season: waterlogged ground is cold and unworkable in spring, so sowing is late and germination patchy.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
Sandy	Grows well here	Christmas cactus grows perfectly well on sandy without special measures, though it is not the soil it would choose.
Chalky and alkaline	Works, with one condition	Christmas cactus will crop on chalky and alkaline, but one thing has to be dealt with first. The soil is substantially too alkaline for it: it wants pH 5.5 to 6.5, and this soil sits around 7.8 to 8.5.The pH is the obstacle. Small shifts are achievable and slow; large ones are not. On chalky and alkaline the dependable answer is a container of the right compost rather than an attempt to change the ground.
Loam	Grows well here	Christmas cactus grows perfectly well on loam without special measures, though it is not the soil it would choose.
Silty	Grows well here	Christmas cactus grows perfectly well on silty without special measures, though it is not the soil it would choose.
Peaty and acid	Works, with one condition	Christmas cactus will crop on peaty and acid, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. For a crop lifted before winter the risk is not rot but the season: waterlogged ground is cold and unworkable in spring, so sowing is late and germination patchy.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
Shallow over rock	Grows well here	Christmas cactus grows perfectly well on shallow over rock without special measures, though it is not the soil it would choose.
Made ground and urban soil	Struggles here	Christmas cactus struggles on made ground and urban soil: The soil is substantially too alkaline for it: it wants pH 5.5 to 6.5, and this soil sits around 7.2 to 7.8. It needs ground that drains, and this soil holds water. For a crop lifted before winter the risk is not rot but the season: waterlogged ground is cold and unworkable in spring, so sowing is late and germination patchy. A container or a raised bed of imported soil sidesteps the problem entirely.

Not sure which you have? Four hand tests will settle it.

Space and spacing

Mature height: 25–40 cm
Mature spread: 40–60 cm
Rooting depth: 15 cm

Where these figures come from

Mature heightHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Mature spreadHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Rooting depthHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

In a container

Minimum volume: 2 litres or more
Minimum depth: 12 cm

Where the container figures come from

Minimum volumeHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Minimum depthHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

Flowers better slightly pot-bound.

Where and how you can grow it

Each way of growing is assessed separately, and “not assessed” is a real answer rather than a gap we have filled in with a guess.

Method	Suitability	What it needs
Indoor pot	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Container	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13	Indoors, or outdoors in summer only
Windowsill	Workable source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Open ground	Not suitable source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13	Tender: will not survive a British winter outdoors.

Growing it

ProtectionTo set flower buds it needs about six weeks of long uninterrupted nights and temperatures around 12–15 °C in autumn. A room lamp switched on each evening is enough to prevent budding entirely.
Do not move or turn it once buds have formed. A sudden change in light or temperature makes it drop the buds.
PropagationTwist off a piece of two or three flattened stem segments at a joint rather than cutting across one, and leave it on a windowsill for a day or two so the wound dries. Push the base into damp gritty compost. Rooting an undried segment into wet compost is the one reliable way to fail.
WateringWater when the top couple of centimetres are dry through growth and flowering — it is a forest epiphyte rather than a desert cactus and should never be kept bone dry. The autumn is the part that matters: from about six weeks before you want flowers, cut watering right back and keep it cool, and once the buds have set go back to normal watering and then do not move the plant. Buds dropping off just before opening is the classic complaint, and the cause is almost always a change — being moved, a draught, or letting it dry out completely once the buds are formed.
FeedingFeed monthly with a half-strength balanced feed from spring until late summer, then switch to a high-potash feed such as tomato food for a few weeks in early autumn as the buds are being initiated, and stop once they are visible. Nothing while it is in flower or immediately after. Feeding through the autumn with a general fertiliser is one of the reasons a plant makes plenty of fresh green segments and no flowers — the other, and the bigger one, is that it was kept in a warm lit room in October instead of a cool one with long uninterrupted nights.

Where this guidance comes from

ProtectionSourced guidancehigh confidence: Royal Horticultural Society: Schlumbergera — flowering
Checked 2026-08-13
Item 2Sourced guidancehigh confidence: Royal Horticultural Society: Schlumbergera — bud drop
Checked 2026-08-13
PropagationSourced guidancemoderate confidence: Royal Horticultural Society: Schlumbergera — propagation
Checked 2026-08-13
WateringSourced guidancehigh confidence: Royal Horticultural Society: Schlumbergera — cultivation
Checked 2026-08-13
FeedingSourced guidancemoderate confidence: Royal Horticultural Society: Schlumbergera — cultivation
Checked 2026-08-13

The rule is the same in all four: the new piece needs both a growing point and roots of its own. A cutting is the exception that has to make its roots afterwards, which is why the node matters so much.

What goes wrong

Problem	How often	Notes
No dormant rest period	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13	Buds need long uninterrupted nights in a cool room from mid-September.

Safety and edibility

Cats and dogs

Listed as non-toxic to cats and dogs

Christmas cactus appears on published non-toxic lists for cats and dogs. That is a statement about the plant's chemistry, not a guarantee: any plant eaten in quantity can upset an animal, so it is still worth discouraging heavy chewing.

source

Sourced guidancehigh confidence

ASPCA Animal Poison Control Center — toxic and non-toxic plant list — American Society for the Prevention of Cruelty to Animals: Schlumbergera bridgesii — non-toxic plants list

Checked 2026-08-13

Sources for this page

GrowingHQ editorial synthesis · Plant Finder · Royal Horticultural Society

Each figure on this page carries its own citation, under the “where these figures come from” note in its section. Record last reviewed 2026-08-14.

If something is wrong with it

Sudden leaf drop — 2 causes GrowingHQ holds for christmas cactus
Plant wilting although the soil is moist — 2 causes GrowingHQ holds for christmas cactus
Lower leaves turning yellow — 2 causes GrowingHQ holds for christmas cactus

Something else? Work through it with the diagnostic tool.