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Christmas cactus

Schlumbergera x buckleyi

The true Christmas cactus - the hybrid Schlumbergera x buckleyi - a long-lived epiphytic holiday cactus grown indoors almost everywhere for its arching, segmented stems and its rose-to-magenta flowers that open in mid-winter, around Christmas. It is worth getting the identity right, because most plants sold and labeled as 'Christmas cactus' are actually the Thanksgiving cactus, Schlumbergera truncata. You can tell the two apart by the edges of the flat stem segments and by when they bloom: the true Christmas cactus has rounded, scalloped segment margins and flowers a few weeks later, in mid-winter, while the Thanksgiving cactus has sharp, claw-like teeth and blooms from late fall into early winter. Unlike a desert cactus, this is a forest epiphyte that grows on tree branches in the Atlantic coastal forest of southeastern Brazil, so it wants bright indirect light, a free-draining mix, sparing water, and - to set its buds - cool nights and short days. A reassuring point that sets it apart from many houseplants: it is non-toxic to cats and dogs. One more field mark clinches it: the true Christmas cactus has rose-pink pollen and flowers that hang almost regularly (radially), where the Thanksgiving cactus has yellow pollen and asymmetric blooms held out nearly horizontally.

Climate fit: narrow (21/100)

Container

Focal point

Light

Part shade

Water

Moderate water

Mature size

9-12" tall · 14" apart

Hardy in zones

10a-12b

mild to frost-free winters

Native status

Cultivated - no wild native range

Grown strictly as an ornamental houseplant - it is not a food plant, and the small fruit, while not poisonous, is not eaten.

°C

°F

Cold hardiness

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.

Now

Zone 6b

Plotwright

USDA Zone 6b

-5°F to 0°F

Won't grow here

2050

2100

Zone 7a

Plotwright

0°F to 5°F

Won't grow here

In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.

✕

Out of range today and still out of range in 2050.

Heat tolerance

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.

Loading AHS heat-zone data for this location...

What it needs

Conditions

Light

Part shade

Water

Moderate water

Spacing

14"

Habit

Arching, weeping epiphytic holiday cactus grown as a houseplant

Care tips

•

Treat it as a forest epiphyte, not a desert cactus: bright indirect light, a free-draining mix, and water only when the top of the mix dries - it rots in cold, soggy soil far more readily than it suffers from a missed watering.

•

To get it to bloom around Christmas, give it the cool, short-day trigger in fall: about 6 weeks of long, uninterrupted nights (12-14 hours of darkness, including no lamp or porch light) and cool nights around 50 to 60°F, then resume normal care once buds appear.

•

Once buds form, leave it put - stop moving, rotating, re-potting, or changing its watering, because sudden changes in light, temperature, or moisture are the classic cause of bud drop.

Lifecycle

Planting

Winter hardy only to about USDA zones 10a-12b, so it is grown outdoors only in frost-free climates; everywhere else it is a houseplant. Pot it in a small container in a free-draining, slightly acidic mix (a cactus mix lightened with bark or perlite, or an epiphyte/orchid blend) and give it bright indirect light - never harsh midday sun, which scorches and reddens the segments.

Transplanting

Re-pot only every few years and only when truly rootbound; it flowers best when slightly crowded. Move it up just one pot size into fresh free-draining mix in spring after flowering, never while it is in bud or bloom, since disturbance and changes in light make it drop buds.

Early growth

Through spring and summer, water when the top of the mix dries and let it drain freely; feed lightly while it is in active growth. Keep it warm and in bright indirect light, and pinch or twist off a segment or two after bloom to encourage branching and more flowering tips.

Maturity

A mature plant stays a manageable 9 to 12 inches tall with arching stems 12 to 24 inches across that cascade in a basket. To set buds it needs a cool, short-day trigger in fall - roughly 6 weeks of long, uninterrupted nights (about 12-14 hours of darkness) and cool nights around 50 to 60°F. Once buds form, stop moving and rotating it, since changes in light and temperature make it shed buds.

Propagation

Very easily propagated from stem cuttings: twist off a piece of two to three segments, let the cut end callus for a day or two, then root it in barely moist, free-draining mix. Cuttings root readily, and because this is a hybrid, named cultivars and flower colors are kept true only from cuttings, not seed.

Plant this, not that

Better fit for this place

For Chicago, IL, these are replacement suggestions: similar plants with a stronger hardiness fit now and/or in 2050.

Hyacinthus orientalis

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A spring-flowering bulb grown for dense upright spikes of waxy, star-shaped florets in blue, purple, pink, red, or white - famous for an intense, sometimes overpowering fragrance. Plant bulbs in mid-fall for an April bloom; flower quality typically declines after the first year, so the densest spikes often need replanting every couple of seasons. Every part of the bulb is mildly toxic and the sap can cause contact dermatitis, so gloves are advised when planting.

Perennial

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Better fit now and in 2050

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Better fit now and in 2050

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Hylotelephium 'Herbstfreude'

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Better fit now and in 2050

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Better fit now and in 2050

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Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.

Open pink and white Hippeastrum hybrid flowers showing trumpet-shaped blooms with prominent stamens in a garden setting

Hippeastrum x hybridum

Amaryllis

Hippeastrum x hybridum is a complex garden hybrid derived from six or more wild Hippeastrum species native to tropical and subtropical South America, developed through intensive breeding since the late 18th century and now the dominant "amaryllis" sold worldwide as a holiday bulb. It produces spectacular trumpet-shaped flowers - 5 to 8 inches across - on stout leafless scapes in red, pink, white, orange, salmon, or bicolour, making it one of the most dramatic winter-flowering houseplants available. The honest catch is toxicity: the entire plant, especially the bulb, contains lycorine and related alkaloids at concentrations that cause vomiting, salivation, tremors, and hypotension in pets and children, so it must be placed out of reach and handled with care.

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Hyacinthus orientalis

Common hyacinth

A spring-flowering bulb grown for dense upright spikes of waxy, star-shaped florets in blue, purple, pink, red, or white - famous for an intense, sometimes overpowering fragrance. Plant bulbs in mid-fall for an April bloom; flower quality typically declines after the first year, so the densest spikes often need replanting every couple of seasons. Every part of the bulb is mildly toxic and the sap can cause contact dermatitis, so gloves are advised when planting.

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Full sun / Part shade

Cushion haworthia is a tiny, choice, clump-forming succulent whose plump, soft, blue-green leaves end in translucent "windows" - in the wild the plant pulls itself down into the soil and lets light reach its inner tissues through these clear leaf tips, an adaptation to the bright, dry Karoo light. POWO (Kew) places it native to the Eastern Cape of South Africa (Cape Provinces). It is a jewel for a pot or a windowsill rather than a garden plant. Unusually for this group of succulents, it prefers BRIGHT INDIRECT light or part shade rather than harsh full sun, which scorches and reddens it; give it sharp drainage and water sparingly during growth, far less in winter. OVERWATERING - and cold, wet soil - is the main way it dies, and it is FROST-TENDER (RHS rates it tender, H1c-H2), so almost everywhere it is grown as a houseplant or in a frost-free greenhouse. It is grown for its jewel-like translucent foliage, not as a food plant, and it rarely flowers in cultivation.

Perennial

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Veltheimia bracteata, the forest lily, is a winter-growing bulbous perennial from the forest margins and coastal scrub of South Africa's Eastern Cape, grown for its glossy rosette of wavy-edged strap leaves and a tall, dense raceme of pendent tubular flowers in shades of pink to rose, blooming in late winter through spring when little else is in flower. It is frost-tender (RHS H2): it tolerates cool conditions but not freezing, so outside roughly USDA zone 9b-11 it is grown as a container or conservatory bulb, dormant and dry through summer. It thrives in semi-shade with humus-rich, well-drained soil and makes an excellent pot specimen. The bird-pollinated flowers attract sunbirds. As a member of Asparagaceae (subfamily Scilloideae), it is grown for ornament only; the bulb is toxic and must not be eaten. It is well-behaved and not reported as invasive.

Perennial

Part shade / Part sun

An evergreen, clump-forming shade perennial grown for its bold rounded heads of funnel-shaped orange (or yellow) flowers held on stout stalks above arching, strap-shaped, dark-green leaves in late winter and spring. Known respectfully as the Natal lily, bush lily, or simply clivia, it is one of the finest plants for dry shade in frost-free gardens and a classic houseplant everywhere else. Native to South Africa - the Cape provinces, KwaZulu-Natal, and Eswatini (POWO, Kew) - it is frost-tender (hardy roughly in USDA zones 9b-11) and is grown in a container or as a houseplant wherever winters dip below freezing. Two things are load-bearing: grown indoors it needs a cool, dry winter rest of about six to eight weeks kept cool and barely watered to set flower buds, then warmth and water to bloom; and every part is toxic (lycorine and related alkaloids) to people and pets if eaten, with sap that can irritate skin. It resents disturbance and flowers best when slightly pot-bound, so it is happiest left alone in the same pot for years.

Gasteria bicolor is a slow-growing, tongue-leaved succulent native to the Eastern Cape of South Africa, where it grows on rocky slopes and outcrops in thicket vegetation around Port Elizabeth (a summer-rainfall region). Its mottled, strap-shaped leaves and arching racemes of curved, stomach-shaped pink-to-orange flowers make it a forgiving container plant for warm, frost-free settings, and it tolerates light shade better than most succulents - a useful trait for brighter indoor positions. The honest catch is its tenderness: it is damaged below about 41°F and cannot survive frost, so gardeners outside USDA zones 9b-11 must overwinter it indoors. It is a container-and-houseplant plant, not a garden perennial in most of the world.

Perennial

Part sun / Part shade

Educator packet

Plant packet

Christmas cactus educator packet

The true Christmas cactus - the hybrid Schlumbergera x buckleyi - a long-lived epiphytic holiday cactus grown indoors almost everywhere for its arching, segmented stems and its rose-to-magenta flowers that open in mid-winter, around Christmas. It is worth getting the identity right, because most plants sold and labeled as 'Christmas cactus' are actually the Thanksgiving cactus, Schlumbergera truncata. You can tell the two apart by the edges of the flat stem segments and by when they bloom: the true Christmas cactus has rounded, scalloped segment margins and flowers a few weeks later, in mid-winter, while the Thanksgiving cactus has sharp, claw-like teeth and blooms from late fall into early winter. Unlike a desert cactus, this is a forest epiphyte that grows on tree branches in the Atlantic coastal forest of southeastern Brazil, so it wants bright indirect light, a free-draining mix, sparing water, and - to set its buds - cool nights and short days. A reassuring point that sets it apart from many houseplants: it is non-toxic to cats and dogs. One more field mark clinches it: the true Christmas cactus has rose-pink pollen and flowers that hang almost regularly (radially), where the Thanksgiving cactus has yellow pollen and asymmetric blooms held out nearly horizontally.

Scientific name

Schlumbergera x buckleyi

Plant type

perennial

Hardiness

10a-12b

Light

part-shade

Moisture

moderate

Spacing

14 inches

Classroom prompts

- Which plant traits are observations, and which are care recommendations?

- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?

- Which source-backed facts would you cite in a lesson handout?

Use the Sources & citations section below for page citation styles and the field-level source list.

Sources & citations

Cite this page

For lesson plans, articles, or research that uses this page. Use the source cards below to explore the references that informed this record.

Plotwright. (2026, May 17). Christmas cactus (Schlumbergera x buckleyi). Retrieved 2026, August 20, from https://plotwright.com/plants/schlumbergera-x-buckleyi

Sources used for this record

This record is compiled from the sources below.

GBIF

Botanical research database

Open source

Source guide

Wikipedia (ecoregion articles)

Botanical research database

Open source

Source guide

Wikimedia Commons

Photo · CC BY-SA 2.5 ca