Blooming: Crown of Thorns

Blooming: Crown of Thorns

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As with most flowering plants, the better the sun exposure, the more blooms you will get. Euphorbia needs direct sunlight and it will reliably bloom as long as it receives at least three to four hours of bright sunlight per day. Outdoors, try to place it under full sun. Indoors, place your plant in a west or south-facing spot during winter.


If growing outdoors, plant in well-draining soil and full sun. In dry climates, the plants will appreciate some mid-day shade for better blooms. Crown of thorns is a very adaptable houseplant. It needs a well-draining cactus potting mix and should not be planted in a container that is more than an inch or two larger than the root ball. If there is excess soil, it will retain water and could cause the roots to rot. 


Since it is a succulent, crown of thorns is very forgiving about water. Water when the soil feels dry about 1 inch below the surface. Water thoroughly and allow any excess to drain off. Do not let your plant sit in water or wet soil for prolonged periods of time or the roots will rot. Crown of thorns will go semi-dormant in the winter and need less frequent watering and no food.

Temperature and Humidity

At least half a day of sunlight is a major requirement for crown of thorns. Temperature-wise, a comfortable 65 to 75 degrees Fahrenheit is good. Don’t worry if you lower the thermostat at night; crown of thorns can handle temperatures down to 50 degrees Fahrenheit.


From spring through fall, feed your crown of thorns with a balanced houseplant fertilizer. You can do this every other time you water if you dilute the fertilizer to half strength.


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