Euphorbia Milii Red – Hardy Shrub with Vibrant Red Flowers for Your Garden Cold Hardy: Thrives in USDA zones 9-11, perfect for warmer climates. Compact Size: Grows in a 4-inch pot, ideal for containers and small garden spaces. Low Maintenance: Requires minimal care and grows well in full sunlight. Crown of Thorns Plant Live, Well-rooted 5-9 Inc Tall, Euphorbia Milii Crown of Thorn Tree, Cold Hardy (Red)