Crocosmia vs Crown of Thorns Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Crocosmia
Crocosmia × crocosmiiflora
Crocosmia × crocosmiiflora is a deciduous, clump-forming perennial flowering plant primarily grown outdoors for its vibrant, arching sprays of tubular flowers. It typically reaches a height of 60-75 cm. The flowers are usually orange or red, attracting hummingbirds and butterflies. It grows from corms and spreads via rhizomes. While it can be grown in containers, it is not ideally suited for indoor environments due to its high light requirements and dormancy period. People grow it for its bright summer blooms and easy propagation.
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.
Quick Plant Comparison
| Feature | Crocosmia | Crown of Thorns |
|---|---|---|
| Light | Full sun to partial shade. Requires at least 6 hours of direct sunlight daily for optimal flowering. | Requires at least 4-6 hours of direct sunlight daily. Insufficient light will result in leggy growth and reduced flowering. |
| Watering | Every 1-2 weeks during the growing season, less frequently during dormancy. | Every 2-3 weeks, depending on environmental conditions and pot size. |
| Humidity | 40-60% | 30-50% |
| Temperature | 15-25°C | 18-27°C |
| Care Level | Expert | Moderate |
| Growth Rate | Moderate | Slow |
| Max Height | 60-75 cm (outdoors); less predictable indoors, potentially smaller. | 0.3-0.6 meters (indoors) |
| Pet Safety | ❌ Toxic To Pets | ❌ Toxic To Pets |
| Soil | Well-draining soil, such as a mix of loam, sand, and compost. | Well-draining succulent or cactus mix |
| Beginner Friendly | ❌ No | With Caution |
| Weekly Maintenance | 15 minutes weekly during the growing season. | 10 minutes weekly |
🔬 Botanical Information — Comparing These Plants
Crocosmia
| Scientific Name | Crocosmia × crocosmiiflora |
|---|---|
| Family | Iridaceae |
| Native To | Hybrid origin, derived from species native to South Africa |
| Also Known As | Montbretia, Coppertips, Falling Stars |
| Leaves | The leaves are sword-shaped, linear, and mid-green in color. They are typically 30-60 cm long and 1-2 cm wide. The texture is smooth and slightly glossy. |
| Flowers | Crocosmia rarely flowers indoors due to insufficient light. Outdoors, it produces vibrant, tubular flowers in shades of orange, red, and yellow. The flowers are arranged in arching sprays and bloom in summer. |
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. |
📏 Size & Growth — Plant Comparison
Crocosmia
Crown of Thorns
🌱 Propagation — Comparing Plant Growth
Crocosmia
Methods: Division of corms, seed.
Difficulty: Easy
Tips: Divide corms in spring or fall. Replant immediately in well-draining soil. Seeds can be sown in spring after a period of cold stratification.
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.
✨ Benefits & Features — Comparing Plant Value
Crocosmia
Crocosmia's arching sprays of brightly colored flowers are a standout feature in any garden. The saffron-like scent of the dried leaves is another unique characteristic. Its ability to attract hummingbirds and butterflies makes it a valuable addition to pollinator gardens.
- ✓ Attracts pollinators
- ✓ Adds vibrant color to the garden
- ✓ Relatively low maintenance
- ✓ Easy to propagate
- ✓ Provides a naturalistic aesthetic
- ⚠️ Toxic to pets
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
📅 Maintenance Schedule — Plant Care Comparison
Crocosmia
Crown of Thorns
🌞 Light Requirements
Crocosmia
Full sun to partial shade. Requires at least 6 hours of direct sunlight daily for optimal flowering.
Low light tolerant: ❌ No
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
💧 Watering Needs
Crocosmia
Water thoroughly when the top inch of soil feels dry. Avoid overwatering, which can lead to corm rot. During dormancy, reduce watering significantly. Signs of overwatering include yellowing leaves and mushy corms. Underwatering results in wilting and browning leaf tips.
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.
🌡️ Temperature & Humidity
Crocosmia
Temperature: 15-25°C
Humidity: 40-60%
Crown of Thorns
Temperature: 18-27°C
Humidity: 30-50%
🤔 Which Plant Is Right For You?
Crocosmia
Crocosmia × crocosmiifloraGardeners looking for vibrant summer blooms in sunny locations.
✅ Choose This Plant If...
- You want to attract hummingbirds and butterflies to your garden.
- You appreciate vibrant orange or red flowers in summer.
- You are looking for a relatively low-maintenance perennial for a sunny spot.
- You enjoy propagating plants through division.
- You want a plant that adds a splash of color to your outdoor space.
❌ Skip This Plant If...
- You have pets that might ingest the plant.
- You lack a sunny outdoor space.
- You are looking for a low-maintenance indoor plant.
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.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Crocosmia is rated Expert care level, while Crown of Thorns is Moderate.
Crocosmia has moderate growth, while Crown of Thorns grows slow.
💡 Pro Tips For Comparing These Plants
Crocosmia Care Tips
Crocosmia is primarily an outdoor plant. Indoor cultivation is challenging due to high light requirements and dormancy needs. It requires full sun, well-draining soil, and careful watering. It spreads via rhizomes, so container size needs to be monitored. Toxicity to pets is a significant concern.
- Plant in well-draining soil to prevent corm rot.
- Provide full sun for optimal flowering.
- Divide corms every few years to prevent overcrowding.
- Water deeply but infrequently, allowing the soil to dry out slightly between waterings.
- Fertilize monthly during the growing season with a balanced liquid fertilizer.
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.
⚠️ Common Problems & Solutions — Plant Care Comparison
Crocosmia
Crown of Thorns
❓ Frequently Asked Questions — Comparing These Plants
Crocosmia
What are the light requirements for Crocosmia?
Crocosmia thrives in full sun, requiring at least 6 hours of direct sunlight per day for optimal growth and abundant flowering. While it can tolerate partial shade, especially in hotter climates, reduced sunlight may result in fewer blooms and weaker stems. When planting Crocosmia, choose a location that receives plenty of morning and afternoon sun. Avoid planting near large trees or structures that may cast excessive shade. If growing Crocosmia in containers, rotate them regularly to ensure even exposure to sunlight. In regions with intense summer heat, providing some afternoon shade can help prevent scorching of the foliage. Monitor the plants for signs of insufficient light, such as leggy growth or a lack of flowering. Adjust the location or supplement with artificial lighting if necessary.
How do I care for Crocosmia?
Crocosmia requires well-draining soil and a sunny location for optimal growth and flowering. Plant corms in spring, about 3-4 inches deep and 6-8 inches apart. Water thoroughly after planting and maintain consistent moisture throughout the growing season, especially during dry spells. Fertilize in spring with a balanced fertilizer to promote healthy growth and abundant blooms. Deadhead spent flowers to encourage further flowering. In colder climates, lift the corms in the fall after the foliage has died back and store them in a cool, dry place over winter. Alternatively, provide a thick layer of mulch for winter protection. Divide clumps every few years to prevent overcrowding and maintain vigor. Monitor for pests and diseases, and treat promptly if necessary. With proper care, Crocosmia will reward you with a stunning display of vibrant blooms year after year. Ensure good air circulation to prevent fungal diseases.
How do I propagate Crocosmia?
Crocosmia is easily propagated by division of corms. In early spring or fall, carefully dig up the clump and separate the corms. Ensure each division has healthy roots and foliage. Replant the divisions in well-draining soil and water thoroughly. Stem cuttings can also be taken in late spring or early summer. Take a cutting about 4-6 inches long, remove the lower leaves, and dip the cut end in rooting hormone. Plant the cutting in a pot filled with moist potting mix. Keep the soil moist and provide indirect light until roots develop. Keiki propagation is not applicable to Crocosmia.
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).
Last updated: May 1, 2026 — Plant care data reviewed and verified by our editorial team.