Crown of Thorns in Southern Michigan: Not Winter-Hardy

5-Ft Crown of Thorns in Pot—Can It Stay Outside in Winter?

Owner in southern Michigan asks if it survives winter outdoors.

Greg: won't survive hard freeze even in AZ. Plant is from warmer climate. Link to Desert Tropicals profile.

Cactus: Green Film on Crown of Thorns: Moss/Fungus from Overwatering; Rose Bush Powdery Mildew: Atomic Grow for Bloom Explosion; Fixing a Leggy, Drooping Crown of Thorns (Euphorbia milii); Rescuing a Crown of Thorns (Euphorbia milii) from a Glass Container; Crown of Thorns Care in Houston: Not Below 40°F, Cactus Soil, Fertilize Monthly, No Direct Sun; Transplanting a 40-Year-Old Crown of Thorns (Euphorbia milii); Crown of Thorns Left in Freeze: Wait and See; Crown of Thorns Care: Refer to Houseplant Experts; Bougainvillea in Hanging Basket: Move to Large Container; Crown of Thorns (Euphorbia milii): Year-Round Blooms on a Tough Succulent

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