Crown of Thorns Left in Freeze: Wait and See

If frozen briefly, it may resprout from roots. Place in warm sunny window, water minimally, wait 2 months. If no growth, discard.

House Plants: Green Film on Crown of Thorns: Moss/Fungus from Overwatering; Rescuing a Crown of Thorns (Euphorbia milii) from a Glass Container; Crown of Thorns in Southern Michigan: Not Winter-Hardy; 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); Reviving a Drooping Arrowhead Plant (Nepthytis); Mystery Plant from Downsizing Neighbor: Aluminum Plant / Watermelon Plant (Pilea cadierei); Tall Narrow-Leaf Plant: Likely Dracaena marginata, Can Be Cut & Rerooted; Crown of Thorns Care: Refer to Houseplant Experts; Crown of Thorns (Euphorbia milii): Year-Round Blooms on a Tough Succulent

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