Crown of Thorns vs Ornamental Kale Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Crown of Thorns
Euphorbia milii
Euphorbia milii, commonly known as Crown of Thorns, is a succulent shrub characterized by its thorny stems and vibrant bracts surrounding small, inconspicuous flowers. Native to Madagascar, it is a popular ornamental plant grown for its drought tolerance and long-lasting blooms. It typically grows as a sprawling shrub, reaching up to 1-2 meters in height. While it can be grown indoors, it thrives best with ample sunlight, often making it more suitable as an outdoor plant in warmer climates. People grow it for its unique appearance and relatively easy care.
Ornamental Kale
Brassica oleracea var. acephala
Ornamental kale is a cool-season biennial grown as an annual for its colorful foliage. It is not grown for consumption, though technically edible. The plant forms a rosette of broad, ruffled or frilled leaves in shades of green, purple, pink, red, and white. The vibrant colors intensify in cooler temperatures. It is primarily an outdoor plant, thriving in full sun and cool weather. People grow it for its decorative appeal in gardens, containers, and borders, providing color and texture in the fall and winter months.
Quick Plant Comparison
| Feature | Crown of Thorns | Ornamental Kale |
|---|---|---|
| Light | Requires at least 4-6 hours of direct sunlight daily. Insufficient light will result in leggy growth and reduced flowering. | Full sun to partial shade. Requires at least 6 hours of direct sunlight for best color development. |
| Watering | Every 2-3 weeks, depending on environmental conditions and pot size. | Every 2-3 days outdoors, less frequently indoors if attempted. |
| Humidity | 30-50% | 40-60% |
| Temperature | 18-27°C | 7-18°C |
| Care Level | Moderate | Expert |
| Growth Rate | Slow | Moderate |
| Max Height | 0.3-0.6 meters (indoors) | 15-30 cm |
| Pet Safety | ❌ Toxic To Pets | ❌ Mildly Toxic |
| Soil | Well-draining succulent or cactus mix | Well-draining potting mix rich in organic matter. A mix of garden soil, peat moss, and perlite is suitable. |
| Beginner Friendly | With Caution | ❌ No |
| Weekly Maintenance | 10 minutes weekly | 10 minutes weekly |
🔬 Botanical Information — Comparing These Plants
Crown of Thorns
| Scientific Name | Euphorbia milii |
|---|---|
| Family | Euphorbiaceae |
| Native To | Madagascar |
| Also Known As | Crown of Thorns, Christ Plant, Christ Thorn |
| Leaves | The leaves are small, oval-shaped, and typically bright green. They are deciduous, meaning they may drop off during periods of stress or dormancy, especially in winter. |
| Flowers | It can flower indoors, but flowering is more prolific with ample sunlight. The true flowers are small and inconspicuous, surrounded by colorful bracts that can be red, pink, yellow, or white. |
Ornamental Kale
| Scientific Name | Brassica oleracea var. acephala |
|---|---|
| Family | Brassicaceae |
| Native To | Mediterranean region |
| Also Known As | Ornamental Kale, Flowering Kale, Ornamental Cabbage |
| Leaves | The leaves are broad, ruffled, or frilled, with colors ranging from green to purple, pink, red, and white. The leaf texture is often waxy or slightly glossy. |
| Flowers | Ornamental kale will eventually flower, especially in warmer temperatures or after a period of cold. The flowers are small, yellow, and typical of the Brassica family. Flowering (bolting) signals the end of its ornamental value. |
📏 Size & Growth — Plant Comparison
Crown of Thorns
Ornamental Kale
🌱 Propagation — Comparing Plant Growth
Crown of Thorns
Methods: Stem cuttings
Difficulty: Easy
Tips: Allow the cut end to callus over for a few days before planting in well-draining soil. Use rooting hormone for better success.
Ornamental Kale
Methods: Seed
Difficulty: Easy
Tips: Sow seeds indoors 6-8 weeks before the last expected frost. Transplant seedlings outdoors after the danger of frost has passed.
✨ Benefits & Features — Comparing Plant Value
Crown of Thorns
The Crown of Thorns is unique due to its thorny stems and the colorful bracts that surround its small flowers. Unlike many flowering plants, the bracts provide color for extended periods, making it a long-lasting ornamental plant.
- ✓ Drought tolerance makes it easy to care for
- ✓ Long-lasting blooms add color to your space
- ✓ Unique appearance provides visual interest
- ✓ Can tolerate neglect, making it suitable for busy individuals
- ✓ Adds a touch of history and symbolism to your plant collection
- ⚠️ Toxic to pets
Ornamental Kale
Ornamental kale is unique for its vibrant colors and ruffled leaves, providing a striking contrast to other fall and winter plants. Its colors intensify as temperatures drop, making it a popular choice for cool-season gardens.
- ✓ Adds vibrant color to cool-season gardens
- ✓ Provides visual interest during the dormant season
- ✓ Attracts beneficial insects
- ✓ Easy to grow outdoors in suitable climates
- ✓ Can be used in cut flower arrangements
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Crown of Thorns
Ornamental Kale
🌞 Light Requirements
Crown of Thorns
Requires at least 4-6 hours of direct sunlight daily. Insufficient light will result in leggy growth and reduced flowering.
Low light tolerant: ❌ No
Ornamental Kale
Full sun to partial shade. Requires at least 6 hours of direct sunlight for best color development.
Low light tolerant: ❌ No
💧 Watering Needs
Crown of Thorns
Allow the soil to dry out completely between waterings. Overwatering can lead to root rot. Water thoroughly when the soil is dry to the touch. Signs of overwatering include yellowing leaves and stem rot. Underwatering will cause leaf drop and shriveling.
Ornamental Kale
Water regularly, keeping the soil consistently moist but not waterlogged. Check the soil moisture by sticking your finger about an inch deep. If it feels dry, water thoroughly until water drains from the bottom of the pot. Overwatering can lead to root rot, indicated by yellowing and wilting leaves. Underwatering will cause the leaves to droop and become crispy.
🌡️ Temperature & Humidity
Crown of Thorns
Temperature: 18-27°C
Humidity: 30-50%
Ornamental Kale
Temperature: 7-18°C
Humidity: 40-60%
🤔 Which Plant Is Right For You?
Crown of Thorns
Euphorbia miliiExperienced plant owners who can provide bright light and are aware of the plant's toxicity.
✅ Choose This Plant If...
- You want a drought-tolerant plant that flowers for a long period.
- You have a sunny location where the plant can thrive.
- You are experienced with caring for succulents and understand their watering needs.
- You are looking for a unique and interesting plant with a historical connection.
- You can keep the plant away from pets and children due to its toxicity.
❌ Skip This Plant If...
- You have pets or small children who might ingest the plant.
- You cannot provide adequate sunlight.
- You tend to overwater plants.
- You are looking for a low-maintenance plant that thrives in low-light conditions.
Ornamental Kale
Brassica oleracea var. acephalaGardeners looking for colorful foliage in cool-season gardens and containers.
✅ Choose This Plant If...
- You want vibrant fall and winter color in your garden.
- You need a cool-season plant for containers.
- You want to attract beneficial insects to your garden.
- You enjoy experimenting with different textures and colors in your landscape.
- You have a sunny location with well-draining soil.
❌ Skip This Plant If...
- You live in a warm climate where it will quickly bolt.
- You don't have a sunny outdoor space.
- You have pets that might ingest it and experience gastrointestinal upset.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Crown of Thorns is rated Moderate care level, while Ornamental Kale is Expert.
Crown of Thorns has slow growth, while Ornamental Kale grows moderate.
💡 Pro Tips For Comparing These Plants
Crown of Thorns Care Tips
Crown of Thorns requires bright sunlight and well-draining soil. Overwatering is a common issue. It can be grown indoors with sufficient light, but may not flower as profusely as when grown outdoors. Toxicity to pets is a significant concern.
- Provide at least 4-6 hours of direct sunlight daily for optimal growth and flowering.
- Allow the soil to dry out completely between waterings to prevent root rot.
- Use a well-draining succulent or cactus mix to ensure proper drainage.
- Fertilize sparingly during the growing season with a balanced liquid fertilizer.
- Wear gloves when pruning or handling the plant to avoid skin irritation from the sap.
Ornamental Kale Care Tips
Ornamental kale is primarily an outdoor plant that thrives in cool weather and full sun. Growing it indoors is challenging as it requires very bright light and cool temperatures to maintain its color and form. It is susceptible to pests and diseases, and its lifespan is relatively short.
- Plant in well-draining soil to prevent root rot.
- Provide full sun for best color development.
- Water regularly, especially during dry periods.
- Fertilize every 2-3 weeks with a balanced liquid fertilizer.
- Protect from frost in colder climates.
⚠️ Common Problems & Solutions — Plant Care Comparison
Crown of Thorns
Ornamental Kale
❓ Frequently Asked Questions — Comparing These Plants
Crown of Thorns
What are the light requirements for Crown of Thorns?
Crown of Thorns requires bright, direct sunlight to thrive. Ideally, place it in a south-facing window where it can receive at least 4-6 hours of sunlight per day. Insufficient light can lead to leggy growth, reduced flowering, and a loss of vibrancy in the bracts. If you don’t have a sufficiently sunny window, consider supplementing with a grow light. Rotate the plant regularly to ensure even light exposure on all sides. During the summer months, you can move your Crown of Thorns outdoors to a sunny location, but be sure to acclimate it gradually to avoid sunburn. The plant’s ability to flower profusely depends on adequate light.
How do I care for Crown of Thorns?
Crown of Thorns thrives on neglect, making it an easy-care succulent. Plant it in well-draining soil, such as a cactus mix, to prevent root rot. Provide it with bright, direct sunlight for at least 4-6 hours daily. Water sparingly, allowing the soil to dry completely between waterings. Reduce watering frequency during the dormant winter months. Fertilize lightly during the growing season (spring and summer) with a balanced liquid fertilizer diluted to half strength. Maintain a room temperature between 65-75°F (18-24°C). Avoid overwatering, as this is the most common cause of problems. Repot every 2-3 years, or when the plant becomes root-bound. Prune to maintain shape and remove dead or damaged stems. Be cautious of the milky sap, which can be irritating to the skin and eyes.
How do I propagate Crown of Thorns?
Crown of Thorns can be propagated through stem cuttings. Allow the cut end to callous over for several days before planting in well-draining soil. Keep the soil slightly moist until roots develop. Leaf cuttings are not generally successful. Offsets, or small plantlets that grow at the base of the plant, can be carefully separated and potted individually. Wear gloves to protect your skin from the irritating sap. Rooting hormone can improve the success rate of stem cuttings. Provide bright, indirect light during the rooting process. Avoid overwatering, as this can lead to rot. Propagation is best done during the growing season (spring and summer).
Ornamental Kale
What are the light requirements for Ornamental Kale?
Ornamental Kale needs at least 6 hours of direct sunlight per day to develop its best color. Insufficient light can result in leggy growth and dull foliage. When planting, choose a location that receives full sun, especially during the cooler months. In warmer climates, providing some afternoon shade can prevent the leaves from scorching. For container-grown Ornamental Kale, rotate the pot regularly to ensure even light exposure. If growing indoors, supplement with grow lights to provide adequate illumination. East-facing windows are generally suitable, but south-facing windows may require shading during the hottest part of the day.
How do I care for Ornamental Kale?
Ornamental Kale thrives in cool weather and prefers full sun to partial shade. Plant it in well-draining soil that is rich in organic matter. Water regularly, especially during dry spells, but avoid overwatering, which can lead to root rot. Fertilize every 2-3 weeks with a balanced fertilizer during the growing season to promote vibrant colors. Deadhead any yellowing or damaged leaves to maintain its appearance. Protect from pests such as aphids and cabbage worms. Ensure good air circulation to prevent fungal diseases. Monitor for signs of disease or pest infestation and treat promptly. Provide support if the plant becomes top-heavy. Adjust watering and fertilization based on weather conditions.
How do I propagate Ornamental Kale?
Ornamental Kale is typically grown from seed, but it can also be propagated through stem cuttings, although this is less common. To propagate from stem cuttings, take a 4-6 inch cutting from a healthy stem, removing the lower leaves. Dip the cut end in rooting hormone and plant in a well-draining potting mix. Keep the soil moist and provide indirect light until roots develop.
Last updated: May 11, 2026 — Plant care data reviewed and verified by our editorial team.