Euphorbia hermentiana is deciduous. Yellowing/leaf drop in fall/winter = response to shortening days.
This is genetic programming, not a problem. New leaves emerge in spring.
Yellowing Base on Euphorbia hermentiana After Repotting
Why a Young Ocotillo Has Flowers But No Leaves
Ocotillo Leaf Drop in Fall: Normal Drought Response, Not Drip Irrigation
Broken Aloe Plant: Species Verification Needed for Proper Rescue
Aloe Vera Brown Spots: Insect Damage, Not Fungus
Euphorbia Cactus Rotting: Cut Black Parts with Full Protection
Ligustrum Leaf Spots, Bark Stripping, and Stunting in North Carolina
Lilac Bacterial Blight: Brown-to-Black Leaves, Not Just Water Issues
20‑Year‑Old Hoya Not Blooming: Light, Pruning, and Fertilizer Fixes
Diagnosing Top-Down Dieback in Euphorbia (Not Cactus)
Identifying Haworthia: Distinguishing attenuata vs. fasciata
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