Christmas Cactus: identification
Quick answer
Schlumbergera species identification depends on three key morphological features: (1) stem segment shape — Thanksgiving cactus (S. truncata) has claw-shaped projections on segments vs. Christmas cactus (S. bridgesii) with rounded, symmetric segments; (2) bloom timing — Thanksgiving cactus flowers in November (photoperiod < 12h after fall equinox), Christmas cactus blooms December-January (requires 6 weeks of <10h darkness + cool 50-55°F temps); (3) anther color — Thanksgiving has yellow anthers, Christmas has pink-purple anthers.
Start here:
- 1. Examine stem segments: Thanksgiving cactus has notched, claw-like projections on segment edges; Christmas cactus segments have rounded, symmetric edges with no teeth
- 2. Track bloom timing: flowers appearing in late October-November indicate Thanksgiving cactus; December-January bloom indicates Christmas cactus
identification for Christmas Cactus
Schlumbergera bridgesii
Schlumbergera species identification depends on three key morphological features: (1) stem segment shape — Thanksgiving cactus (S. truncata) has claw-shaped projections on segments vs. Christmas cactus (S. bridgesii) with rounded, symmetric segments; (2) bloom timing — Thanksgiving cactus flowers in November (photoperiod < 12h after fall equinox), Christmas cactus blooms December-January (requires 6 weeks of <10h darkness + cool 50-55°F temps); (3) anther color — Thanksgiving has yellow anthers, Christmas has pink-purple anthers.
How to handle identification on Christmas Cactus
- 1
Examine stem segments: Thanksgiving cactus has notched, claw-like projections on segment edges; Christmas cactus segments have rounded, symmetric edges with no teeth
- 2
Track bloom timing: flowers appearing in late October-November indicate Thanksgiving cactus; December-January bloom indicates Christmas cactus
- 3
Inspect flower anthers: yellow anthers = Thanksgiving cactus (S. truncata); pink-purple anthers = Christmas cactus (S. bridgesii)
- 4
Easter cactus (Hatiora gaertneri) segments have rounded edges with sparse hair-like scales but no teeth, and flowers face outward (not hanging)
- 5
If uncertain, consult cultivar name from nursery label or search by uploaded photo using plant identification apps
Ongoing Christmas Cactus notes
To identify your plant: check segment edges for claw-like protrusions (Thanksgiving) vs. rounded edges (Christmas); note bloom month; examine anther color at flower center.