Exacum vs Hazel Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Exacum
Exacum affine
Exacum affine, commonly known as Persian Violet, is a small, bushy, herbaceous perennial often grown as an annual. It typically reaches a height of 15-30 cm. It features small, oval, glossy green leaves and a profusion of fragrant, star-shaped flowers, usually violet-blue, but also available in white, pink, and lavender. While technically a perennial, it is most often cultivated as an annual or a houseplant due to its sensitivity to cold temperatures. People grow it for its charming, long-lasting blooms and sweet fragrance.
Hazel
Corylus avellana
Corylus avellana, or Hazel, is a deciduous shrub or small tree typically reaching 3-8 meters (10-26 feet) in height. It features multiple stems and a rounded crown. The bark is smooth and grayish-brown when young, becoming slightly fissured with age. Hazelnuts are primarily grown outdoors for their edible nuts and ornamental value. They are not naturally suited for indoor environments due to their size, light requirements, and need for seasonal dormancy. People grow them for nut production, wildlife attraction, and as a landscape feature.
Quick Plant Comparison
| Feature | Exacum | Hazel |
|---|---|---|
| Light | Bright, indirect light. Avoid direct sunlight, especially during the hottest part of the day. | Full sun to partial shade. Requires at least 6 hours of direct sunlight daily for optimal nut production. |
| Watering | Every 5-7 days, depending on environmental conditions | Water deeply 1-2 times per week during the first growing season, then as needed during dry spells. |
| Humidity | 40-60% | 30-50% |
| Temperature | 18-21°C | 10-24°C |
| Care Level | Moderate | Expert |
| Growth Rate | Moderate | Moderate |
| Max Height | 15-30 cm | Not suitable for indoor growing. Outdoors: 3-8 meters (10-26 feet) |
| Pet Safety | ❌ Toxic To Pets | ❌ Toxic To Pets |
| Soil | Well-draining potting mix, such as a mix of peat moss, perlite, and vermiculite. | Well-draining loam or sandy loam with a slightly acidic to neutral pH (6.0-7.5). |
| Beginner Friendly | With Caution | ❌ No |
| Weekly Maintenance | 10 minutes weekly | 30 minutes monthly (pruning, fertilizing, pest control) |
🔬 Botanical Information — Comparing These Plants
Exacum
| Scientific Name | Exacum affine |
|---|---|
| Family | Gentianaceae |
| Native To | Socotra Island (Yemen) |
| Also Known As | Persian Violet, German Violet, Arabian Violet, Tiny Violet |
| Leaves | Small, oval, and glossy green leaves, typically 2-4 cm long. They have a smooth texture and are arranged oppositely along the stems. |
| Flowers | Yes, it flowers indoors readily with proper care. The flowers are star-shaped, about 1-2 cm in diameter, and typically violet-blue, but can also be white, pink, or lavender. They have a sweet, noticeable fragrance. |
Hazel
| Scientific Name | Corylus avellana |
|---|---|
| Family | Betulaceae |
| Native To | Europe and Western Asia |
| Also Known As | Hazel, Common Hazel, Filbert |
| Leaves | The leaves are alternate, simple, ovate to rounded, 6-12 cm long and wide, with a doubly serrated margin. They are green in summer, turning yellow to bronze in the fall. |
| Flowers | Hazel produces separate male and female flowers. The male flowers are catkins, which are long, pendulous structures that release pollen in late winter or early spring. The female flowers are small, inconspicuous buds that develop into hazelnuts. |
📏 Size & Growth — Plant Comparison
Exacum
Hazel
🌱 Propagation — Comparing Plant Growth
Exacum
Methods: Seed, Stem cuttings
Difficulty: Moderate
Tips: For seeds, sow in spring. For stem cuttings, take cuttings in spring or summer and root in moist potting mix. Maintain high humidity.
Hazel
Methods: Seed, Layering, Suckers, Grafting
Difficulty: Moderate
Tips: Collect seeds in the fall and stratify them over winter. Layering is best done in spring or fall. Suckers can be dug up and transplanted. Grafting is used to propagate specific cultivars.
✨ Benefits & Features — Comparing Plant Value
Exacum
The intense fragrance of its small, star-shaped flowers is a standout feature. It is often grown as an annual, despite being a perennial, due to its specific environmental needs.
- ✓ Adds a splash of color to indoor spaces.
- ✓ Provides a pleasant fragrance.
- ✓ Can improve mood and reduce stress.
- ✓ Relatively compact size makes it suitable for small spaces.
- ✓ Long blooming period provides extended enjoyment.
- ⚠️ Toxic to pets
Hazel
Hazel is known for its edible nuts, which are a valuable food source for humans and wildlife. The catkins, or male flowers, are also an attractive feature in late winter, providing early pollen for pollinators.
- ✓ Provides edible nuts.
- ✓ Attracts wildlife to the garden.
- ✓ Offers shade and visual interest.
- ✓ Can be used as a windbreak or privacy screen.
- ✓ Supports local ecosystems.
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Exacum
Hazel
🌞 Light Requirements
Exacum
Bright, indirect light. Avoid direct sunlight, especially during the hottest part of the day.
Low light tolerant: ❌ No
Hazel
Full sun to partial shade. Requires at least 6 hours of direct sunlight daily for optimal nut production.
Low light tolerant: ❌ No
💧 Watering Needs
Exacum
Water thoroughly when the top inch of soil feels dry to the touch. Ensure good drainage to prevent root rot. Overwatering can lead to yellowing leaves and fungal diseases. Underwatering will cause wilting and bud drop.
Hazel
Water deeply when planting and during dry periods, especially when young. Established trees are relatively drought-tolerant. Overwatering can lead to root rot, so ensure well-draining soil. Check soil moisture before watering.
🌡️ Temperature & Humidity
Exacum
Temperature: 18-21°C
Humidity: 40-60%
Hazel
Temperature: 10-24°C
Humidity: 30-50%
🤔 Which Plant Is Right For You?
Exacum
Exacum affineSomeone who appreciates fragrant, flowering houseplants and is willing to provide the necessary care to maintain humidity and prevent overwatering.
✅ Choose This Plant If...
- You love fragrant flowers and want a plant that blooms for a long time.
- You can provide bright, indirect light and maintain moderate humidity.
- You are attentive to watering needs and can avoid overwatering.
- You enjoy the challenge of caring for a slightly more demanding houseplant.
- You want a compact plant that fits well on a windowsill or small table.
❌ Skip This Plant If...
- You have pets that might ingest the plant.
- You tend to overwater your plants.
- You struggle to provide adequate humidity.
- You prefer low-maintenance plants that tolerate neglect.
Hazel
Corylus avellanaGardeners with ample outdoor space who want to grow their own hazelnuts.
✅ Choose This Plant If...
- You have a large outdoor space suitable for a tree or shrub.
- You want to grow your own hazelnuts.
- You want to attract wildlife to your garden.
- You appreciate the ornamental value of the foliage.
- You are experienced with tree and shrub care.
❌ Skip This Plant If...
- You live in an apartment or have limited outdoor space.
- You are looking for an indoor plant.
- You have pets that might ingest the plant.
- You are a beginner gardener.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Exacum is rated Moderate care level, while Hazel is Expert.
💡 Pro Tips For Comparing These Plants
Exacum Care Tips
Exacum affine requires bright, indirect light, consistent moisture, and moderate humidity. It is sensitive to overwatering and cold drafts. Maintaining proper humidity is crucial for preventing bud drop. It is toxic to pets, so keep it out of reach.
- Use a well-draining potting mix to prevent root rot.
- Maintain moderate humidity by misting regularly or using a humidifier.
- Avoid placing the plant in direct sunlight, which can scorch the leaves.
- Pinch back stems to encourage bushier growth and more blooms.
- Fertilize regularly during the growing season to promote flowering.
Hazel Care Tips
Hazel is an outdoor plant that is not suitable for indoor growing. It requires full sun, well-draining soil, and seasonal dormancy. Indoor attempts will likely fail due to insufficient light, space, and the inability to replicate natural seasonal cycles.
- Choose disease-resistant varieties to minimize problems.
- Provide adequate water during the first few years to establish a strong root system.
- Protect young trees from deer and other herbivores.
- Prune regularly to maintain shape and promote nut production.
- Monitor for pests and diseases and treat promptly.
⚠️ Common Problems & Solutions — Plant Care Comparison
Exacum
Hazel
❓ Frequently Asked Questions — Comparing These Plants
Exacum
What are the light requirements for Exacum?
Exacum thrives in bright, indirect light. An east-facing window is ideal, providing gentle morning sun. Avoid direct sunlight, especially during the hottest part of the day, as it can burn the delicate leaves and fade the flowers. If you don’t have access to a bright window, consider using a grow light to supplement the natural light. Rotate the plant regularly to ensure even growth and blooming on all sides. Insufficient light can result in leggy growth and reduced flowering. If the leaves start to turn pale or yellow, it may be a sign of too much direct light.
How do I care for Exacum?
Exacum prefers bright, indirect light; direct sunlight can scorch the leaves. Water when the top inch of soil feels dry, ensuring proper drainage to prevent root rot. Maintain moderate humidity, ideally between 50-60%. Fertilize every 2-4 weeks during the blooming season with a balanced liquid fertilizer diluted to half strength. Keep temperatures between 60-75°F (15-24°C). Prune spent flowers to encourage continuous blooming. Repot only when necessary, using a well-draining potting mix. Avoid overwatering and provide good air circulation. Monitor for pests such as aphids or spider mites and treat promptly. Deadhead regularly. Provide a consistent environment to avoid stress. Ensure adequate drainage to prevent soggy soil.
How do I propagate Exacum?
Exacum can be propagated from stem cuttings. Take a 2-3 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 bright, indirect light. Cover with a plastic bag to increase humidity. Roots should develop within a few weeks. Once rooted, transplant into a larger pot. Exacum is not typically propagated by division or keiki. Ensure the cutting is free from disease or pests. Mist regularly to maintain humidity during rooting. Provide bottom heat to encourage faster root development.
Hazel
What are the light requirements for Hazel?
Hazel trees thrive in bright, indirect light. Avoid placing them in direct sunlight, especially during the hottest parts of the day, as this can cause leaf scorch. An east-facing window is often ideal, providing gentle morning light. A north-facing window can also work if the light is bright enough. If you notice the leaves becoming pale or yellowing, it may indicate that the plant is receiving too much light. Conversely, if the plant is not growing well or the leaves are small and sparse, it may not be getting enough light. Supplementing with a grow light can be beneficial, especially during the winter months.
How do I care for Hazel?
Providing the right care is essential for a thriving indoor Hazel. Water thoroughly when the top inch of soil feels dry, ensuring proper drainage to prevent root rot. Place your Hazel in a location with bright, indirect light. Avoid direct sunlight, which can scorch the leaves. Maintain a moderate humidity level, especially during dry winter months, by misting regularly or using a humidifier. Fertilize sparingly, only during the growing season (spring and summer), with a balanced liquid fertilizer diluted to half strength. Repot your Hazel every 2-3 years, or when it becomes root-bound, into a slightly larger pot with well-draining potting mix. Prune regularly to maintain its shape and remove any dead or damaged branches. Consistent care and stable conditions are key to a happy and healthy indoor Hazel.
How do I propagate Hazel?
Hazels can be propagated through stem cuttings or air layering. For stem cuttings, take a 4-6 inch cutting from new growth in spring or early summer. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cutting in a well-draining potting mix and keep it moist in a humid environment. For air layering, select a healthy stem and make a small incision. Wrap the incision with moist sphagnum moss and cover it with plastic wrap. Secure the plastic wrap with tape and check the moisture level regularly. Once roots have formed, cut the stem below the roots and plant it in a pot. Both methods require patience and consistent moisture to be successful.
Last updated: May 12, 2026 — Plant care data reviewed and verified by our editorial team.