The biggest difference between a Thanksgiving and Christmas cactus shows up right on the edges of their stem segments. Thanksgiving cacti have pointed claw-like teeth along each segment, while Christmas cacti have smooth rounded scallops with no sharp points. This one feature tells you which plant you have in about two seconds flat.
Stores mislabel these plants all the time. Thanksgiving vs christmas cactus identification gets tough when tags are wrong. I bought what the tag called a Christmas cactus from a big box store a few years back. The stems had 2 to 4 sharp serrations on each side of every segment. Those claw teeth told me I had a Thanksgiving cactus, not the Christmas type on the label.
The two plants come from different branches of the family tree. Thanksgiving cactus goes by Schlumbergera truncata and grows wild in the mountains of Brazil. Christmas cactus goes by Schlumbergera x buckleyi. It's a hybrid that blends truncata and russelliana genes. This mix gives Christmas cacti features that sit between both parents in stem shape and growth.
I now keep one of each side by side on my windowsill. The contrast makes the stem differences obvious at a glance. The Thanksgiving cactus segments look like tiny crab claws with sharp teeth sticking out at angles. The Christmas cactus segments have a softer, more scalloped look with no points at all. Seeing them next to each other is the fastest way to train your eye.
Flowers give you another reliable clue during bloom season. Thanksgiving cactus blooms point outward and slightly upward from the stem tips. Look inside and you'll see yellow pollen anthers. Christmas cactus flowers hang downward and carry purple-brown anthers instead. Bloom timing splits them apart too. Thanksgiving types flower in mid to late November. True Christmas cacti hold off until late December or January.
Care needs differ between the two plants as well. Thanksgiving cacti grow faster and push out more stem segments per year. They handle warmer indoor temps during bud season without trouble. Christmas cacti need a longer cool period to set buds. They prefer nights closer to 50°F (10°C) for best results. Knowing which type you own helps you give it the right care at the right time.
You can also check the overall plant shape for clues. Thanksgiving cacti grow in a more upright and bushy form with stems that point outward and up. Christmas cacti tend to trail and droop over the pot edges as they get older. A mature Christmas cactus looks more like a hanging basket plant, while a Thanksgiving cactus holds itself up with a stiffer structure. This growth pattern shows up best in plants that are three years or older.
A third plant rounds out this holiday cactus comparison. The Easter cactus blooms in spring and has star-shaped flowers with small bristly hairs at each segment joint. Its stem edges look more rounded than either holiday cousin. Garden centers sell all three under vague labels, so checking segment shape is your best defense.
Next time you stand in a garden center, use this three-step check before you buy. First, run your finger along the stem segment edge and feel for sharp points or smooth curves. Second, look at the flowers if any are present and note if they point outward or hang down. Third, check the bloom date since Thanksgiving varieties hit peak flower weeks before Christmas types. These three steps take under a minute and save you from years of confusion about which plant sits on your windowsill.
Read the full article: Thanksgiving Cactus Care Guide
