Your spiky, 12" plant is likely Madagascar Palm (Pachypodium lamerei). It drops leaves in winter naturally. Needs full sun, very little water, gritty soil, no fertilizer. Summer outdoors above 50°F. Don't overwater—leaf loss is seasonal, not fatal.
Rotting Barrel Cactus: Low Survival Odds
Neoraimondia herzogiana: Natural Woody Trunk Formation Is Healthy
Tall Cactus Basal Rot: Thin Species = Cut and Root, Fat Species = Lost
Euphorbia Cold Damage: Fast Rot Spread, Basal Damage = Likely Loss
Top-Down Cactus Rot: Frost vs. Root Death, Euphorbia Exception
Drooping Cactus After Move: Likely Euphorbia, Needs Light
Christmas Cactus (Schlumbergera): Holiday Blooms for Generations
How to Get Your Night-Blooming Cereus to Flower
Cactus Shriveling and Yellow Spots: Root Rot or Drought?
Euphorbia lactea Frost Damage: Pruning and Care
Getting Rattail Cactus (Aporocactus) to Bloom Indoors
Easter Cactus: Starburst Blooms in Spring
Thanksgiving Cactus (Schlumbergera truncata): Care & Blooming Guide
Christmas Cactus Care: How to Get Reliable Holiday Blooms Every Year
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