Christmas cactus care: the complete guide

Q: Is Christmas cactus the same as Thanksgiving cactus?

Usually not, even though most plants sold as "Christmas cactus" are actually Thanksgiving cactus. True Christmas cactus is Schlumbergera x buckleyi, with scalloped, teardrop-shaped stem teeth and a December bloom. Thanksgiving cactus, Schlumbergera truncata, has sharp claw-like teeth and blooms in November, but nurseries rarely distinguish the two on the tag. Easter cactus is a third, unrelated plant entirely, covered in this site's own Easter cactus guide.

Q: How often should you water a Christmas cactus?

Water every 1 to 2 weeks, or once the soil has almost, but not completely, dried out. Reduce watering slightly in mid-September as flower buds develop, then keep the soil evenly moist once buds have set, since letting it dry out at that stage is a leading cause of bud drop.

Guidance verified against Clemson Cooperative Extension HGIC and North Carolina State Extension Gardener Plant Toolbox on 27 September 2026. Sources linked below.

Christmas cactus wants bright indirect light, soil kept lightly moist rather than fully dry, and average household humidity. It blooms only after cool nights of 55 to 65°F and at least 13 hours of uninterrupted darkness every night for several weeks in autumn, and it is non-toxic to cats and dogs. Most plants sold under this name are technically a close relative, Thanksgiving cactus, not the true species.

Attribute	What a Christmas cactus needs
Light	Bright, indirect light or light shade; direct summer sun scorches and pales the segments
Water	Every 1 to 2 weeks, once the soil has almost but not fully dried out; keep evenly moist once buds have set
Humidity	Average household humidity is fine; appreciates more while budding and in bloom
Soil / pot	Well-draining mix with good aeration, about 60 to 80 percent potting soil to 20 to 40 percent perlite
Fertiliser	Balanced fertiliser monthly in spring and summer; stop by late summer to support bud set
Temperature	70 to 80°F (21 to 27°C) day; needs 55 to 65°F (13 to 18°C) nights plus 13+ hours of darkness to bloom
Toxicity	Non-toxic to cats and dogs, ASPCA direct entry

The full attribute schema at a glance. houseplantcarehq.com · Houseplant Care HQ

Is Christmas cactus the same as Thanksgiving cactus?

Usually not, even though almost every plant sold at a nursery or grocery store as "Christmas cactus" is actually Thanksgiving cactus. Per North Carolina State Extension, true Christmas cactus is Schlumbergera x buckleyi, with scalloped, rounded, teardrop-shaped teeth along the edge of each flat stem segment and a bloom window in mid to late December. Thanksgiving cactus, Schlumbergera truncata, has sharp, claw-like teeth instead and blooms about a month earlier, in November, but the two are close relatives with near-identical care needs, and retailers almost never separate them on the plant tag. A third plant carries a similar holiday name but is not even the same genus: this site's own Easter cactus guide covers Hatiora gaertneri, a spring-blooming epiphyte with rounded, bristly-edged segments and no teeth at all.

Sold or described as	Actual plant	Segment teeth	Bloom window
Christmas cactus (true)	Schlumbergera x buckleyi (this guide)	Scalloped, teardrop-shaped	Mid to late December
Christmas cactus (most commonly sold)	Schlumbergera truncata, actually Thanksgiving cactus	Sharp, claw-like	November
Easter cactus	Hatiora gaertneri, see Easter cactus care	Rounded, bristly, no teeth	Spring, March to May

How much light does a Christmas cactus need?

Give it bright, indirect light, or light shade; it does not need, or want, hours of direct sun. Per Clemson Cooperative Extension HGIC, full sun during summer makes the flat stem segments look pale and yellowed, while a spot with some direct winter sun through a window is genuinely welcome once daylight is weaker. A north or east-facing window suits it for most of the year. The general light guide covers reading a room's light level for other plants.

How often should you water a Christmas cactus?

Water every 1 to 2 weeks, or whenever the soil has almost, but not completely, dried out. Per Clemson Cooperative Extension HGIC, reduce watering slightly in mid-September as flower buds start to develop, then switch back to keeping the soil evenly moist once buds have set, since a pot that dries out at that stage is a leading, and easily avoidable, cause of the bud drop covered further down this page. The general watering guide covers the finger test and how the right interval varies by species.

Does a Christmas cactus need humidity?

No; ordinary household humidity suits it for most of the year, though it appreciates a little more while it is budding and in flower. This is a far less demanding humidity requirement than tropical foliage plants such as this site's own calathea or Boston fern, which both need a real humidity floor to avoid crisping. A pebble tray or occasional misting during the autumn bud-set window helps, but nothing more is required the rest of the year. The general humidity guide covers the plants that do need more than this.

What soil and pot does a Christmas cactus need?

Use a well-draining mix with good aeration, roughly 60 to 80 percent potting soil to 20 to 40 percent perlite, in a pot with drainage holes. Per Clemson Cooperative Extension HGIC, this is a genuine jungle epiphyte, the same growth habit as this site's Easter cactus, not a desert species, so a bone-dry, gritty succulent mix drains too fast and holds too little moisture for it. The general soil and pot guide covers mix types and pot sizing for other houseplants, including the desert cacti that need the opposite mix.

How and when do you fertilise a Christmas cactus?

Feed with a balanced fertiliser about once a month during spring and summer, and stop by late summer so the plant channels energy into setting flower buds instead of new growth. Clemson Cooperative Extension HGIC also notes an optional monthly feed of Epsom salts, one teaspoon of magnesium sulfate per gallon of water, applied on a separate week from the regular fertiliser, as a bloom-supporting supplement some growers use. The general fertilising guide covers dilution rates and spotting salt build-up in the soil for other houseplants.

Why won't my Christmas cactus bloom?

It needs two conditions together, not just one: cool nights of 55 to 65°F (13 to 18°C) and at least 13 hours of uninterrupted darkness every night, starting around mid-September and continuing for 6 to 8 weeks. Per North Carolina State Extension and Clemson Cooperative Extension HGIC, a plant kept in a warm room year-round, or one exposed to a porch light, streetlight or television glow overnight during that window, will usually stay healthy but set no flower buds at all, since the darkness requirement is broken by even brief light. A closet or an unused room worked into the plant's evening routine achieves the same effect as an outdoor spot. This site's own Easter cactus guide covers a simpler, cold-only bloom trigger; Christmas cactus is the more demanding of the two because it needs the dark period as well as the cold.

Unopened buds dropping before they flower is the other common complaint, and it is rarely the same fault as failing to bud at all. Per Clemson Cooperative Extension HGIC, bud drop is usually triggered by a sudden change in temperature, light or location, a draft, or the soil drying out after buds have already set; moving a budded plant to a new spot, or even turning it to face a window, can be enough. Keeping the plant's position, temperature and watering schedule steady from the moment buds appear prevents most bud drop.

How do you propagate a Christmas cactus?

Pinch or cut off 2 to 5 connected stem segments in late spring, let the cut end callus over for a few days, then plant it directly into barely moist potting mix. Unlike this site's water-rooted stem cuttings for plants such as pothos or monstera, no water-rooting step is used here: the segment roots in the mix itself, typically within a few weeks, per North Carolina State Extension. This is closer in spirit to a leaf cutting than a stem cutting, since a single flat segment, rather than a length of true stem with nodes, grows into the whole new plant. The general propagation guide covers the other main methods used across this site.

Why is my Christmas cactus limp, reddish or losing segments?

Symptom	Likely cause	Fix
Unopened flower buds dropping off	Sudden change in temperature, light or location, or the soil drying out after bud set	Keep position, temperature and watering steady from bud set onward
No buds forming at all through autumn	Missing the combined cold-and-dark trigger	Give it 55 to 65°F nights and 13+ hours of uninterrupted darkness from mid-September
Segments turning reddish-purple	Normal stress response to bright light, cold or dry conditions, not disease	Usually cosmetic; ease off whichever stress factor is present if it bothers you
Limp, collapsing segments, soil staying wet	Overwatering or root rot	Let the soil dry further between waterings; check the roots
Sticky residue or small visible pests in the segment joints	Mealybugs, the most common pest on this genus	See the spider mites and fungus gnats guide for treatment steps

Is a Christmas cactus toxic to cats and dogs?

No. The ASPCA lists Christmas cactus by name as non-toxic to both cats and dogs. Unlike this site's Chinese money plant guide, which relies on a genus-wide pattern because no species-level ASPCA entry exists, Christmas cactus has its own direct, named entry, the more certain of the two kinds of verification this site draws on. Eating a large amount can still cause mild vomiting or an upset stomach from plant fibre alone, the same bulk-related response any houseplant can trigger, but no toxic compound is involved. Contact a vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if a large amount was eaten and symptoms appear.

FAQ

Is Christmas cactus the same as Thanksgiving cactus?: Usually not. Most plants sold as "Christmas cactus" are actually Thanksgiving cactus (Schlumbergera truncata), which blooms in November with claw-like segment teeth. True Christmas cactus (Schlumbergera x buckleyi) has scalloped teeth and blooms in December.
How often should you water a Christmas cactus?: Every 1 to 2 weeks, once the soil has almost dried out. Keep it evenly moist instead once flower buds have set.
Why won't my Christmas cactus bloom?: It needs cool nights of 55 to 65°F and at least 13 hours of uninterrupted darkness nightly, starting mid-September, for 6 to 8 weeks. Missing either condition means no buds.
Is a Christmas cactus toxic to cats and dogs?: No. The ASPCA lists it by name as non-toxic to cats and dogs.
How do you propagate a Christmas cactus?: Cut 2 to 5 connected stem segments, let them callus a few days, then plant directly in barely moist mix. No water-rooting step is needed.

Related guides

Houseplant care: the complete guide

Easter cactus care

Temperature guide

How to propagate houseplants

Which houseplants are safe for pets

Root rot