Chocolate Cosmos vs Dawn Redwood Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Chocolate Cosmos
Cosmos atrosanguineus
Chocolate Cosmos is a tuberous perennial plant prized for its dark, velvety, chocolate-scented flowers. It typically grows to a height of 40-60 cm. The flowers are usually a deep maroon to chocolate brown color and bloom from summer to frost. While it can be grown in containers, it is primarily an outdoor plant that requires specific conditions to thrive. People grow it for its unique flower color, fragrance, and ornamental value in gardens.
Dawn Redwood
Metasequoia glyptostroboides
The Dawn Redwood is a fast-growing, deciduous conifer that can reach impressive heights. It features a pyramidal shape with a straight trunk and feathery, bright green foliage that turns reddish-brown in the fall before shedding its leaves. Naturally an outdoor tree, it is grown for its ornamental value, rapid growth, and unique deciduous nature among conifers. It is a living fossil, once thought to be extinct until its rediscovery in the 1940s.
Quick Plant Comparison
| Feature | Chocolate Cosmos | Dawn Redwood |
|---|---|---|
| Light | Full sun to partial shade. Requires at least 6 hours of direct sunlight for optimal flowering. | Full sun (at least 6 hours of direct sunlight daily) |
| Watering | Every 3-7 days during the growing season, depending on weather and soil drainage. | Once or twice a week during the growing season, less frequently in winter. |
| Humidity | 40-60% | 30-60% |
| Temperature | 18-24°C | 10-27°C |
| Care Level | Expert | Expert |
| Growth Rate | Moderate | Fast |
| Max Height | 40-60 cm | Rarely grown indoors; outdoors, 25-45 meters (80-150 feet) |
| Pet Safety | ❌ Toxic To Pets | ✅ Safe |
| Soil | Well-draining soil, such as a mix of potting soil, perlite, and sand. | Well-drained, slightly acidic soil. Tolerates a range of soil types, including clay and loam. |
| Beginner Friendly | ❌ No | ❌ No |
| Weekly Maintenance | 15 minutes weekly | 15 minutes weekly (primarily watering and occasional pruning) |
🔬 Botanical Information — Comparing These Plants
Chocolate Cosmos
| Scientific Name | Cosmos atrosanguineus |
|---|---|
| Family | Asteraceae |
| Native To | Mexico (endemic to a small area in Mexico; now extinct in the wild) |
| Also Known As | Chocolate Cosmos |
| Leaves | The leaves are pinnately divided, resembling ferns, and are a medium green color. They are finely textured and provide a delicate backdrop to the dark flowers. |
| Flowers | While it may flower indoors under ideal conditions (very bright light), it is more commonly and reliably flowered outdoors. The flowers are typically a deep maroon to chocolate brown color and have a velvety texture. They are approximately 3-5 cm in diameter and have a distinct chocolate scent. |
Dawn Redwood
| Scientific Name | Metasequoia glyptostroboides |
|---|---|
| Family | Cupressaceae |
| Native To | Sichuan-Hubei region of China |
| Also Known As | Dawn Redwood |
| Leaves | Feathery, bright green needles that are arranged oppositely on the branches. The needles turn reddish-brown in the fall before dropping. |
| Flowers | It rarely flowers indoors. Outdoors, it produces small, inconspicuous flowers in early spring. |
📏 Size & Growth — Plant Comparison
Chocolate Cosmos
Dawn Redwood
🌱 Propagation — Comparing Plant Growth
Chocolate Cosmos
Methods: Division, Tubers, Seed (though seed propagation can be challenging and may not produce true-to-type offspring)
Difficulty: Moderate
Tips: Divide tubers in early spring before new growth begins. Plant tubers in well-draining soil and keep moist until established. Seeds can be sown indoors 6-8 weeks before the last frost.
Dawn Redwood
Methods: Seeds, Cuttings
Difficulty: Moderate
Tips: For seeds, stratify them in the refrigerator for a few months before sowing. For cuttings, take semi-hardwood cuttings in late summer and root them in a well-draining medium.
✨ Benefits & Features — Comparing Plant Value
Chocolate Cosmos
The Chocolate Cosmos is unique for its dark, velvety flowers and distinct chocolate scent. It is also notable for being extinct in the wild, with all cultivated plants being clones of a single specimen.
- ✓ Aesthetic appeal with unique dark flowers.
- ✓ Pleasant chocolate fragrance enhances outdoor spaces.
- ✓ Attracts pollinators like bees and butterflies.
- ✓ Provides cut flowers for arrangements.
- ✓ Adds visual interest to garden borders and containers.
- ⚠️ Toxic to pets
Dawn Redwood
The Dawn Redwood is a deciduous conifer, meaning it loses its leaves in the fall, unlike most other conifers. It is also a living fossil, having been rediscovered after being thought extinct for millions of years. Its rapid growth rate is another notable characteristic.
- ✓ Provides shade and shelter for wildlife.
- ✓ Adds beauty and visual interest to the landscape.
- ✓ Relatively low-maintenance once established.
- ✓ Fast-growing and provides quick results.
- ✓ Contributes to carbon sequestration.
- 🐾 Pet Safe
📅 Maintenance Schedule — Plant Care Comparison
Chocolate Cosmos
Dawn Redwood
🌞 Light Requirements
Chocolate Cosmos
Full sun to partial shade. Requires at least 6 hours of direct sunlight for optimal flowering.
Low light tolerant: ❌ No
Dawn Redwood
Full sun (at least 6 hours of direct sunlight daily)
Low light tolerant: ❌ No
💧 Watering Needs
Chocolate Cosmos
Water regularly during the growing season, allowing the top inch of soil to dry out between waterings. Avoid overwatering, which can lead to tuber rot. Reduce watering in the fall as the plant prepares for dormancy. Signs of overwatering include yellowing leaves and a mushy stem base. Underwatering results in wilting and dry, crispy leaves.
Dawn Redwood
Water deeply and regularly, especially during the first few years after planting. Established trees are relatively drought-tolerant but benefit from occasional watering during dry spells. Overwatering can lead to root rot, so ensure good drainage. Signs of underwatering include browning and drooping foliage. Signs of overwatering include yellowing foliage and soggy soil.
🌡️ Temperature & Humidity
Chocolate Cosmos
Temperature: 18-24°C
Humidity: 40-60%
Dawn Redwood
Temperature: 10-27°C
Humidity: 30-60%
🤔 Which Plant Is Right For You?
Chocolate Cosmos
Cosmos atrosanguineusExperienced gardeners who want a unique and fragrant addition to their outdoor garden.
✅ Choose This Plant If...
- You love the unique chocolate scent of the flowers.
- You want a plant with unusual dark-colored blooms.
- You have a sunny garden or patio.
- You enjoy a challenge and are willing to provide the specific care this plant needs.
- You want to attract pollinators to your garden.
❌ Skip This Plant If...
- You have pets that might ingest the plant.
- You don't have a sunny location.
- You are a beginner gardener looking for an easy-care plant.
Dawn Redwood
Metasequoia glyptostroboidesGardeners with large properties who want a fast-growing, ornamental shade tree.
✅ Choose This Plant If...
- You have a large outdoor space and want a fast-growing shade tree.
- You appreciate unique and historically significant plants.
- You want a tree with beautiful fall color.
- You are looking for a relatively low-maintenance tree once established.
- You live in a region with a suitable climate (zones 5-8).
❌ Skip This Plant If...
- You have limited space, as this tree grows very large.
- You are looking for an indoor plant, as this tree requires full sun and outdoor conditions.
- You live in a climate that is too hot or too cold for this tree.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Chocolate Cosmos has moderate growth, while Dawn Redwood grows fast.
💡 Pro Tips For Comparing These Plants
Chocolate Cosmos Care Tips
Chocolate Cosmos is primarily an outdoor plant and requires specific conditions to thrive indoors. It needs ample sunlight, well-draining soil, and careful watering to prevent tuber rot. Indoor cultivation is challenging due to the high light requirements and the need for a cool, dry dormancy period in winter.
- Provide at least 6 hours of direct sunlight daily for optimal flowering.
- Ensure well-draining soil to prevent tuber rot.
- Fertilize regularly during the growing season with a balanced liquid fertilizer.
- Deadhead spent flowers to encourage more blooms.
- Protect from frost in colder climates by lifting and storing tubers indoors.
Dawn Redwood Care Tips
The Dawn Redwood is primarily an outdoor tree and is not suitable for indoor growing. It requires full sun, ample space, and well-drained soil. Attempting to grow it indoors will likely result in a stressed and unhealthy plant due to insufficient light and space.
- Plant in a location with full sun and well-drained soil.
- Water deeply and regularly, especially during the first few years.
- Apply a balanced fertilizer in early spring.
- Prune in late winter or early spring to remove dead or damaged branches.
- Protect young trees from harsh winds and heavy snow.
⚠️ Common Problems & Solutions — Plant Care Comparison
Chocolate Cosmos
Dawn Redwood
❓ Frequently Asked Questions — Comparing These Plants
Chocolate Cosmos
What are the light requirements for Chocolate Cosmos?
Chocolate Cosmos requires at least six hours of direct sunlight daily to thrive and produce abundant blooms. When grown indoors, place it near a sunny window, preferably south-facing. If natural light is insufficient, supplement with grow lights. Insufficient light can lead to leggy growth and reduced flowering. Rotate the plant regularly to ensure even light exposure on all sides. Plants grown in too much shade will produce fewer blooms and may become susceptible to fungal diseases. Monitor the plant’s foliage; pale or yellowish leaves can indicate insufficient light.
How do I care for Chocolate Cosmos?
Chocolate Cosmos thrives in well-draining soil and prefers full sun to partial shade. Water regularly, allowing the soil to dry slightly between waterings; avoid overwatering to prevent root rot. Fertilize every 2-4 weeks during the growing season with a balanced, water-soluble fertilizer, or one specifically formulated for blooming plants. Deadhead spent flowers to encourage continuous blooming. In colder climates, protect from frost or bring indoors during winter. Chocolate Cosmos benefits from consistent humidity, especially when grown indoors. Ensure good air circulation to prevent fungal diseases. Regularly check for pests and address them promptly. Prune back in late fall to encourage bushier growth the following season.
How do I propagate Chocolate Cosmos?
Chocolate Cosmos can be propagated by division or stem cuttings.
Dawn Redwood
What are the light requirements for Dawn Redwood?
Dawn Redwood requires bright, indirect light to thrive indoors. A location near an east- or west-facing window is ideal. Avoid direct sunlight, which can scorch the delicate needles. If natural light is insufficient, supplement with a grow light. Rotate the plant regularly to ensure all sides receive adequate light. Insufficient light can lead to leggy growth and pale foliage. During the winter months, when daylight hours are shorter, providing supplemental light is especially important. Observe the plant closely for signs of light stress, such as yellowing or browning needles. Adjust the plant’s position accordingly to optimize light exposure.
How do I care for Dawn Redwood?
Dawn Redwood thrives indoors with bright, indirect light. Water thoroughly when the top inch of soil feels dry, ensuring good drainage to prevent root rot. Maintain moderate humidity, especially during winter months. Fertilize sparingly during the growing season (spring and summer) with a balanced liquid fertilizer diluted to half strength. Repot every 2-3 years in spring, using a well-draining potting mix. Prune lightly to maintain shape and encourage bushier growth, ideally in late winter or early spring before new growth emerges. Ensure stable temperatures and avoid placing near drafts or heat sources. Rotate the plant regularly to ensure even light exposure. Monitor for pests and address promptly with appropriate treatments. Provide adequate air circulation. Consistent care and attention will result in a healthy and thriving indoor Dawn Redwood.
How do I propagate Dawn Redwood?
Dawn Redwood can be propagated through stem cuttings or air layering. For stem cuttings, take a 4-6 inch cutting from new growth in spring. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cutting in a well-draining potting mix and keep it consistently moist. Cover with a plastic bag to maintain humidity. For air layering, make a shallow cut on a branch and wrap it with moist sphagnum moss. Cover the moss with plastic wrap and secure it tightly. After several weeks, roots will form. Cut the branch below the roots and pot it up in a well-draining potting mix. Both methods require patience and consistent moisture. Success rates are higher with stem cuttings taken in spring.
Last updated: May 14, 2026 — Plant care data reviewed and verified by our editorial team.