To tell a Thanksgiving cactus from a Christmas cactus, look at the edges of the flat stem segments. Thanksgiving cactus has two to four pointed, upward-facing teeth on each segment. Christmas cactus has smooth, scalloped edges with no points. Easter cactus has smoother segments with a few gentle ripples, and it blooms in spring instead.
All three are sold as “holiday cactus,” and all three look alike on the shelf in October. But they bloom at different times and one of them has stricter needs. Here’s the three-second test, and what each one needs.
The three-second test
Pick up one stem segment and run your finger along its edge:
- Pointed teeth, like little claws? Thanksgiving cactus.
- Smooth, rounded scallops? Christmas cactus.
- Smoother still, with just a few soft ripples? Easter cactus.
That’s it. Bloom time confirms it: if your “Christmas cactus” flowers every November, you almost certainly have a Thanksgiving cactus.
Holiday cacti side by side
All the details below come from Iowa State’s Yard and Garden guide, All About Holiday Cacti.
| Thanksgiving cactus | Christmas cactus | Easter cactus | |
|---|---|---|---|
| Botanical name | Schlumbergera truncata | Schlumbergera × buckleyi | Schlumbergera gaertneri |
| Stem segments | 2 to 4 upward-pointing teeth | Scalloped, no pointed teeth | Smoother, with 4 to 6 slight ripples |
| Bloom time | Mid-November to late December | Late November to early February | Mainly March to May |
| Flowers | White to red | About 3-inch, rosy-red | Pink or red |
How do you care for a Thanksgiving cactus and a Christmas cactus?
Much the same way. Iowa State says holiday cacti need 14 to 16 hours of uninterrupted darkness to set buds, though some cultivars respond to as little as 12. Temperature matters as much as darkness: above 70°F prevents flowering even with short days, and 60 to 70°F with short days is ideal.
Once buds form, keep the soil evenly moist, because dryness can cause buds or flowers to drop. And resist moving the plant until the first flowers open.
We wrote a full countdown for setting up those long, cool nights in Christmas cactus not blooming? Start the darkness countdown. It works for Thanksgiving cactus too; the flowers just arrive a little earlier.
How is Easter cactus different?
Easter cactus has stricter requirements. Iowa State says it needs the same 14 to 16 hours of darkness, at 60 to 70°F for 3 to 4 weeks, followed by cooler temperatures of 47 to 55°F for another 4 to 6 weeks. That cool second stage is the one a warm living room can’t provide. If an Easter cactus refuses to flower, give it that cool stretch in a bright, unheated spare room or on a cool windowsill before its spring bloom.
Why does it matter which one you have?
Timing. If you’re hoping for flowers on a particular holiday, it helps to know which clock your plant runs on:
- Thanksgiving cactus starts in mid-November, so it can be in full bloom for the Thanksgiving table (Thursday, November 26, 2026).
- Christmas cactus starts in late November and can carry on into February.
- Easter cactus won’t bloom for the winter holidays at all. Enjoy it in spring.
Where should a holiday cactus sit?
In bright, indirect light by day, in a room that stays cool, and out of the reach of lamps at night during the budding season. If you’re choosing a window, our guide to reading the light by window direction can help. If your cactus spent summer outdoors, bring it in using the checklist in when to bring houseplants inside. It also belongs on the fall care list in our six changes to make in October.
FAQ
Is Thanksgiving cactus the same as Christmas cactus?
No. They’re close relatives in the same genus, Schlumbergera, but different species or hybrids. Thanksgiving cactus (S. truncata) has pointed teeth on its stem segments and blooms earlier. Christmas cactus (S. × buckleyi) has smooth, scalloped segments and blooms later.
Why is my Christmas cactus blooming at Thanksgiving?
It’s most likely a Thanksgiving cactus. Check the stem segments for pointed teeth. Iowa State gives Thanksgiving cactus a bloom window of mid-November to late December.
Are holiday cacti safe for cats and dogs?
The ASPCA lists Christmas cactus (Schlumbergera bridgesii) as non-toxic to dogs, cats and horses. Its database doesn’t have separate entries for Thanksgiving or Easter cactus, so check with your vet if you’re unsure.
How many hours of darkness does a Thanksgiving cactus need?
The same as a Christmas cactus: 14 to 16 hours of uninterrupted darkness, with some cultivars responding to 12, per Iowa State. Keep the room below 70°F.