Give a Christmas cactus bright, indirect light and water it when the top inch of soil is dry (UF/IFAS), letting the pot drain completely. It is a rainforest cactus, not a desert one, so it likes more water than you’d expect. To bloom, it needs about 6 weeks of short days in fall: 12 or more hours of total darkness every night and nights of 55 to 65 °F (University of Minnesota Extension). A lamp at night or a room above 70 °F stops the buds (Iowa State). Once buds form, don’t move it.
Christmas, Thanksgiving or Easter cactus?
Three related plants are sold as holiday cacti, and the one labeled “Christmas cactus” often isn’t: Iowa State Extension says most plants sold under that name are actually Thanksgiving cacti or hybrids. Look at the flat stem segments:
| Plant | Stem segments | Flowers | Blooms |
|---|---|---|---|
| Thanksgiving cactus (Schlumbergera truncata) | 2 to 4 pointed teeth on each side, pointing up (Iowa State, Penn State) | Held out sideways; yellow anthers (Penn State) | Mid-November to late December (Iowa State) |
| Christmas cactus (S. × buckleyi) | Rounded scallops, no points (Iowa State, Penn State) | Droop down; purplish-brown anthers (Penn State) | Late November to early February (Iowa State) |
| Easter cactus (S. gaertneri, also sold as Rhipsalidopsis or Hatiora) | Smoother, with slight ripples and bristles at the tips (Iowa State) | Flat and star-shaped (Penn State) | March to May (Iowa State) |
Christmas and Thanksgiving cacti get the same care, so everything below works for both. The Easter cactus needs a longer, colder fall to bloom (see the questions at the end).
How to get a Christmas cactus to bloom
Holiday cacti are “short-day” plants: they form flower buds when fall nights get long and cool (University of Minnesota Extension). Indoors, lamps and warm rooms cancel both signals, which is why so many don’t flower. Give it this for about six weeks:
- Darkness, every night. At least 12 hours of complete darkness (UMN). Iowa State says most plants need 14 to 16 hours, some bloom with 12, and NC State gives at least 13 hours from mid-September to mid-November. A lamp, kitchen light or even a streetlight through the window can stop the buds (Iowa State). An unused bedroom works well.
- Cool nights. 55 to 65 °F at night, 65 to 70 °F by day (UMN). At 55 °F nights they bloom in about 5 to 6 weeks, sometimes whatever the day length (UMN, Iowa State). Above 70 °F, they won’t bloom even with long nights (Iowa State).
- Bright days. Bright, indirect light during the day (Iowa State).
- Light feeding. In fall, as buds form, switch to a low-nitrogen fertilizer such as 0-15-10 at half strength (UMN).
- Then leave it alone. Once you see buds, don’t move it until the first flowers open: drafts, heat vents and sudden changes make it drop its buds (Iowa State, UMN, UF/IFAS).
Count back about six weeks from when you want flowers:
| Flowers by | Start long, cool nights by about |
|---|---|
| Thanksgiving (November 26, 2026) | Mid-October |
| Christmas (December 25) | Mid-November |
| New Year’s Day | Around November 20 |
Six weeks is the University of Minnesota’s figure for Christmas and Thanksgiving cacti; buds then take time to open, so starting earlier only helps. If yours already has buds, skip this and just keep it cool and in one place.
How often to water a Christmas cactus
Water when the top inch of soil feels dry (UF/IFAS); NC State puts that at about every 1 to 2 weeks, or when the soil is nearly dry. Water thoroughly, let it drain in the sink, and empty the saucer: standing water rots the roots, the most common way these plants die (UMN).
- While it has buds and flowers: keep the soil evenly moist. Drying out makes it drop buds (Iowa State).
- After it blooms: water less often, until new growth starts in spring (UMN, Iowa State).
- Limp stems but wet soil: that’s overwatering, not thirst. Let it dry out and check that the pot drains (UMN).
Light and temperature
Bright, indirect light, such as within six feet of a south-, east- or west-facing window (UF/IFAS). Full sun burns it (Penn State); too much sun shows as pale stems (UMN). Indoors it likes 60 to 70 °F (Iowa State). Keep it away from heat vents, fireplaces and drafty doors (UF/IFAS, UMN).
It can spend summer outdoors in part shade, with 3 to 6 hours of sun, ideally filtered under a tree (UMN). Leave it out in a sheltered spot as the fall nights cool, which helps it set buds, and bring it in before frost (UMN). Look up your date with the ZIP code box above, or on our frost dates by ZIP code page. Before it comes in, check for pests, trim broken stems and wipe the pot (UMN).
In zones 9 to 11 it can grow outdoors all year (NC State), as long as you protect it from freezing (UF/IFAS). What zone am I in?
Soil, pot and fertilizer
- Soil: any potting mix that drains well; a cactus mix isn’t needed (Iowa State). UMN mixes 1 part potting soil, 2 parts peat moss and 1 part perlite or coarse sand.
- Pot: a little small, with drainage holes. It blooms best slightly pot-bound and may need repotting only every three years or so, in spring after flowering (UMN, Iowa State, Penn State).
- Fertilizer: a balanced houseplant fertilizer at half strength, monthly from June to August (UMN). UF/IFAS feeds every one to two months from April to September. In fall, switch to low nitrogen.
- Pruning: after it blooms, cut where two segments join to make it branch: each cut grows one or two new segments (UMN). UF/IFAS says not to prune after midsummer.
How to propagate a Christmas cactus
- Take a cutting of 2 to 5 segments, twisting or cutting it off at a joint (Iowa State).
- Let the cut end dry overnight (Iowa State).
- Plant it about 1 inch deep in moist perlite, coarse sand or a light potting mix, the right way up: upside-down cuttings won’t root (Iowa State).
- Keep it in bright, indirect light and water when the mix starts to dry. Roots form in 3 to 8 weeks (Penn State); Iowa State says 6 to 8. Penn State covers the pot with a clear plastic bag for humidity, and also roots cuttings in water.
Common problems
| What you see | Likely cause and fix |
|---|---|
| No flowers | Light at night or a warm room. Give it 12+ hours of darkness and 55–65 °F nights for six weeks (UMN, Iowa State). |
| Buds fall off | It was moved, or hit by a draft, heat or dry soil. Keep it in one place with even moisture until it blooms (Iowa State, UF/IFAS). |
| Wilted, but the soil is wet | Root rot from too much water. Let it dry, and make sure the pot drains (UMN). |
| Pale, washed-out stems | Too much sun. Move it to bright shade (UMN). |
| Small brown bumps, sticky | Scale insects. Scrape them off or dab them with rubbing alcohol; spray insecticidal soap every 7 to 10 days for bigger infestations (Iowa State). |
| Corky brown base | Normal aging of an old plant (UMN). |
Questions people ask
How often should you water a Christmas cactus?
When the top inch of soil is dry (UF/IFAS), about every 1 to 2 weeks (NC State). Keep it evenly moist while it has buds, and water less after it blooms.
Is my plant a Christmas cactus or a Thanksgiving cactus?
Look at the segments: pointed teeth mean Thanksgiving cactus, rounded scallops mean Christmas cactus (Iowa State). Most plants sold as Christmas cacti are Thanksgiving cacti or hybrids. Their care is the same.
Why won’t my Christmas cactus bloom?
Usually because it gets light at night or the room is too warm. It needs 12 or more hours of total darkness and 55 to 65 °F nights for about six weeks in fall (UMN); above 70 °F it won’t bloom (Iowa State).
Can a Christmas cactus live outside?
In summer, yes, in part shade. Bring it in before frost. In zones 9 to 11 it can stay out all year if protected from freezes (NC State, UF/IFAS).
Is a Christmas cactus poisonous to cats and dogs?
NC State’s Plant Toolbox lists it as non-toxic to cats and dogs.
How do you get an Easter cactus to bloom?
It needs more: in fall, 14 to 16 hours of darkness at 60 to 70 °F for 3 to 4 weeks, then 47 to 55 °F for 4 to 6 weeks, before longer, warmer days (Iowa State). It blooms after about 8 to 12 weeks of short days (UMN).
How long does a Christmas cactus live?
Over 100 years with good care; many are passed down in families (UMN, NC State).
Sources
- University of Minnesota Extension, Holiday cacti (Julie Weisenhorn and Mary Meyer, reviewed 2026): short-day plants; about 6 weeks of short days for Christmas and Thanksgiving cacti, 8 to 12 for Easter; 65–70 °F days and 55–65 °F nights; at 55 °F nights bloom in 5–6 weeks regardless of day length; at 60–65 °F at least 12 hours of complete darkness for about 6 weeks; unlikely to bloom above 65 °F nights; summer in part shade (3–6 hours of sun); outdoors until just before frost; potting mix; watering and drainage; fertilizer June–August and 0-15-10 in fall; bud drop; problems
- Iowa State University Extension, All About Holiday Cacti (Richard Jauron and Aaron Steil, reviewed December 2025): the three types, segment shapes and bloom times; most plants sold as Christmas cacti are Thanksgiving cacti or hybrids; 60–70 °F; 14–16 hours of darkness (some bloom with 12); above 70 °F prevents flowering; 55 °F nights; artificial light at night; don’t move until flowers open; Easter cactus requirements; propagation; scale insects
- Penn State Extension, Holiday Cacti Care (Tenette Bogart, updated September 2025): 68 °F days and 60 °F nights in winter; at least 12 hours of darkness; segments and anther colors; full sun damages; repot every 3–4 years after blooming; cuttings of 3–5 segments root in 3–8 weeks
- NC State Extension, Schlumbergera (Extension Gardener Plant Toolbox): water every 1–2 weeks or when nearly dry; 55–65 °F nights and at least 13 hours of uninterrupted darkness from mid-September to mid-November; hardiness zones 9a–11b; non-toxic to cats and dogs; can live over 100 years
- UF/IFAS Gardening Solutions, Christmas Cactus: at least 12 hours of darkness; within six feet of a south-, east- or west-facing window; water when the upper inch is dry; fertilize every one to two months April–September; don’t prune after midsummer; bud drop; outdoors in warm areas if protected from freezing; no artificial light at night October–December