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Euphorbiaceae BUSH BOTH Placement Primary: Ornamental

Crown of Thorns

Euphorbia milii

Identified By Marcs

The Crown of Thorns is a popular, resilient succulent shrub belonging to the Euphorbiaceae family, native to Madagascar. It is widely recognized for its woody, thorny stems adorned with vibrant, long-lasting cyathia surrounded by colorful bracts that mimic petals, usually in shades of red, pink, or white. This hardy plant is exceptionally drought-tolerant and thrives in warm, sunny climates, making it a favorite for both indoor container gardening and outdoor landscape decoration in frost-free regions. Its striking appearance and low maintenance requirements make it a resilient choice for gardeners seeking year-round color.

Also known as: Christ Plant Christ Thorn

Toxicity & Safety

Is Crown of Thorns toxic to pets?

Yes, toxic to pets.

The Crown of Thorns plant contains a milky white latex sap in its stems and leaves that is highly toxic to cats, dogs, and other household pets. Ingestion of any part of the plant can cause severe irritation to the mouth, tongue, and stomach, often leading to excessive drooling, vomiting, diarrhea, and abdominal pain. Additionally, direct contact with the sap can cause painful skin irritation, redness, and eye damage if it comes into contact with the eyes.

Is Crown of Thorns toxic to humans?

Yes, toxic to humans.

Like all members of the Euphorbia genus, the Crown of Thorns contains a toxic milky sap that can cause significant adverse reactions in humans. Skin contact with the sap can lead to contact dermatitis, characterized by redness, swelling, and painful blistering. If the sap accidentally gets into the eyes, it can cause severe inflammation, irritation, and temporary or even permanent damage to the cornea. Ingestion of the plant causes intense gastrointestinal distress, burning of the mouth and throat, vomiting, and diarrhea.

Is Crown of Thorns safe during pregnancy?

Caution advised during pregnancy.

Due to the potent toxins and irritating latex sap found throughout the Crown of Thorns plant, pregnant individuals should exercise extreme caution and avoid handling or pruning it without protective gear. Accidental ingestion or severe systemic absorption of the plant's toxic compounds can pose serious health risks, potentially inducing severe gastrointestinal distress and complications that could indirectly affect pregnancy health. It is strongly recommended to keep this plant away from areas where vulnerable individuals might accidentally touch or ingest it.

Growth & Dimensions

Height 30 - 180 cm
Width 30 - 90 cm
Growth Rate Moderate
Care Level Easy
Lifespan Perennial

Ideal Environment

Temperature 10°C - 35°C
Sunlight Hours 6 - 10 hrs/day
Sun Exposure Full sun
Soil pH 6 - 7.5
Watering Interval 7 - 14 days
Humidity 30.00% - 60.00%
USDA Zone 9a - 11b

Tropical and Subtropical Climates

Climate: Thrives in warm, frost-free environments with high ambient sunlight levels and low relative humidity, avoiding prolonged exposure to freezing temperatures.

Soils: Sandy loam Cactus mix Well-draining mineral soil
Annual Rainfall: 400 - 1200 mm

Native Regions

Madagascar

How to Care for Crown of Thorns

How should I handle watering your crown of thorns?

Allow the potting soil to dry out completely between watering sessions. Because this plant is a succulent, it stores water in its thick stems and is highly susceptible to root rot if left in standing water. Water thoroughly when dry, ensuring excess water drains away completely from the pot.

How should I handle sunlight and light requirements?

Provide bright, direct sunlight for at least six hours a day to encourage optimal blooming and compact growth. Placing the plant in a south or west-facing window indoors, or in a fully exposed outdoor location, ensures vibrant flower bracts and prevents the stems from becoming weak and leggy.

How to Propagate Crown of Thorns

How to propagate Crown of Thorns by cutting?

To propagate via stem cuttings, select a healthy, non-flowering stem tip and use a sharp, sterile blade to cut a 10 to 15 cm piece. Immediately dip the cut end in warm water or apply rooting hormone to stop the flow of toxic white latex sap. Allow the cutting to dry and form a callous in a shaded, warm area for several days. Once calloused, plant the cutting in a dry, well-draining succulent potting mix, and place it in bright, indirect light. Water sparingly until roots establish within a few weeks.

Common Diseases & Pests of Crown of Thorns

What is Root Rot and how is it treated?

Fungal
Symptoms:

The lower stems and roots turn brown, mushy, and soft. Leaves may turn yellow, drop prematurely, and the entire plant can suddenly wilt despite the soil being moist, ultimately leading to the structural collapse of the specimen.

Treatment:

Remove the plant from its container, gently wash away the infected soil, and use sterile shears to cut away all soft, rotting roots and stems. Replant the healthy remainder in fresh, well-draining succulent soil and withhold water for several days.

Prevention:

Always use a well-draining soil mix specifically formulated for cacti and succulents, ensure pots have functioning drainage holes, and never allow the plant to sit in standing saucer water. Always let the soil dry completely before watering again.

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