Crown of thorns is only perennial in USDA Hardiness Zones 9 to 11, in colder climates, it is often grown as a houseplant
As with most flowering plants, the better the sun exposure, the more blooms you will get, however crown of thorns will reliably bloom as long as it gets at least 3-hours to 4-hours of bright, direct sunlight per day
Caution: besides the sharp black thorns on its main branches and stems, the sticky, latex sap from broken leaves and stems can be a skin and eye irritant, if ingested all parts of the plant are toxic to people and pets
Easy Gardening Ideas for Your Annuals."
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