Borage vs Pencil Tree Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Borage
Borago officinalis
Borage is an annual herb characterized by its bristly, hairy stems and leaves. It typically grows to a height of 1-3 feet. The plant is primarily grown outdoors for its edible leaves and flowers, which have a cucumber-like flavor. The star-shaped, bright blue flowers are a major draw, attracting pollinators like bees. While it can be grown indoors, it requires very bright light and ample space, making it challenging for most indoor environments. It's valued for its culinary and medicinal uses.
Pencil Tree
Euphorbia tirucalli
Euphorbia tirucalli, commonly known as the Pencil Tree, is a succulent shrub or small tree characterized by its smooth, cylindrical, pencil-thick green branches. It is virtually leafless, with small, insignificant leaves that appear briefly and fall off quickly. This plant is primarily grown for its unique architectural form and drought tolerance. It thrives in warm climates and is often used as a landscape plant in arid regions. While it can be grown indoors, it requires very bright light and careful watering to prevent root rot. The milky sap is toxic and can cause skin and eye irritation.
Quick Plant Comparison
| Feature | Borage | Pencil Tree |
|---|---|---|
| Light | Full sun (6-8 hours of direct sunlight daily) | Full sun to very bright indirect light. Requires at least 6-8 hours of direct sunlight daily to thrive. |
| Watering | Every 2-5 days, depending on weather and soil drainage | Every 2-4 weeks, depending on light and temperature. |
| Humidity | 30-50% | 30-50% |
| Temperature | 15-25°C | 18-27°C |
| Care Level | Expert | Expert |
| Growth Rate | Fast | Moderate |
| Max Height | 0.3-0.9 meters (1-3 feet) outdoors; smaller indoors, if attempted | 1-2 meters indoors, up to 7 meters outdoors. |
| Pet Safety | ❌ Toxic To Pets | ❌ Toxic To Pets |
| Soil | Well-draining, loamy soil | Well-draining succulent or cactus mix. |
| Beginner Friendly | ❌ No | ❌ No |
| Weekly Maintenance | 15 minutes weekly | 10 minutes bi-weekly |
🔬 Botanical Information — Comparing These Plants
Borage
| Scientific Name | Borago officinalis |
|---|---|
| Family | Boraginaceae |
| Native To | Mediterranean region |
| Also Known As | Borage, Starflower, Bee Bush, Bee Bread |
| Leaves | The leaves are oval to lance-shaped, 5-15 cm long, and covered in bristly hairs, giving them a rough texture. They are typically a dull green color. The leaves are alternate along the stem. |
| Flowers | Borage produces star-shaped flowers that are typically bright blue, although pink and white varieties exist. The flowers hang downwards and are about 2-3 cm in diameter. They are edible and have a mild, cucumber-like flavor. It will flower outdoors, but is unlikely to flower indoors. |
Pencil Tree
| Scientific Name | Euphorbia tirucalli |
|---|---|
| Family | Euphorbiaceae |
| Native To | East Africa, Madagascar, India |
| Also Known As | Pencil Tree, Milk Bush, Indian Tree Spurge, Naked Lady |
| Leaves | Leaves are small, linear, and inconspicuous, appearing briefly during the growing season and quickly falling off. They are typically less than 1 cm long and are not a prominent feature of the plant. |
| Flowers | Rarely flowers indoors. Outdoors, it may produce small, inconspicuous yellow flowers at the tips of the branches, but flowering is infrequent. |
📏 Size & Growth — Plant Comparison
Borage
Pencil Tree
🌱 Propagation — Comparing Plant Growth
Borage
Methods: Seed
Difficulty: Easy
Tips: Sow seeds directly into the soil in spring after the last frost. Borage self-seeds readily.
Pencil Tree
Methods: Stem cuttings
Difficulty: Moderate
Tips: Allow the cut end to callous over for several days before planting in well-draining soil. Use gloves and eye protection when taking cuttings due to the toxic sap.
✨ Benefits & Features — Comparing Plant Value
Borage
Borage is known for its vibrant blue, star-shaped flowers and its cucumber-like flavor. It's also a significant attractant for pollinators, making it a valuable addition to any garden ecosystem. The hairy texture of the leaves and stems is another distinguishing feature.
- ✓ Attracts beneficial pollinators to your garden
- ✓ Provides edible flowers and leaves for culinary use
- ✓ Can be used in traditional herbal remedies (with caution)
- ✓ Adds a beautiful blue hue to your garden
- ✓ Fast growing and easy to propagate from seed
- ⚠️ Toxic to pets
Pencil Tree
The Pencil Tree is distinguished by its smooth, cylindrical, pencil-thick green branches and its virtually leafless appearance. Its drought tolerance and unique architectural form make it a striking addition to any collection. The milky sap is a key characteristic and a reminder of its toxicity.
- ✓ Drought tolerance
- ✓ Unique sculptural form
- ✓ Low maintenance (once established)
- ✓ Adds visual interest to a space
- ✓ Can be grown outdoors in warm climates
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Borage
Pencil Tree
🌞 Light Requirements
Borage
Full sun (6-8 hours of direct sunlight daily)
Low light tolerant: ❌ No
Pencil Tree
Full sun to very bright indirect light. Requires at least 6-8 hours of direct sunlight daily to thrive.
Low light tolerant: ❌ No
💧 Watering Needs
Borage
Water thoroughly when the top inch of soil feels dry. Avoid overwatering, which can lead to root rot. In hot weather, more frequent watering may be needed. Signs of underwatering include wilting leaves. Signs of overwatering include yellowing leaves and soggy soil.
Pencil Tree
Allow the soil to dry out completely between waterings. Water thoroughly when the soil is dry to the touch, ensuring excess water drains away. Overwatering can lead to root rot. Reduce watering frequency during the dormant winter months. Signs of overwatering include yellowing or mushy stems. Underwatering is indicated by shriveled branches.
🌡️ Temperature & Humidity
Borage
Temperature: 15-25°C
Humidity: 30-50%
Pencil Tree
Temperature: 18-27°C
Humidity: 30-50%
🤔 Which Plant Is Right For You?
Borage
Borago officinalisGardeners looking for a pollinator-attracting herb with edible flowers and leaves.
✅ Choose This Plant If...
- You want to attract pollinators to your garden
- You enjoy edible flowers and leaves with a cucumber-like taste
- You have a sunny outdoor space
- You want a fast-growing annual herb
- You are interested in traditional herbal remedies (with caution and research).
❌ Skip This Plant If...
- You have pets that may ingest the plant
- You lack a sunny outdoor space
- You are looking for a low-maintenance indoor plant
Pencil Tree
Euphorbia tirucalliExperienced plant owners seeking a unique, drought-tolerant plant for a very sunny location.
✅ Choose This Plant If...
- You have a very sunny location indoors or live in a warm, arid climate.
- You want a unique and sculptural plant.
- You are experienced with succulent care.
- You are looking for a drought-tolerant plant.
- You are prepared to handle a toxic plant safely.
❌ Skip This Plant If...
- You have pets or small children who might ingest the plant.
- You cannot provide very bright light.
- You tend to overwater plants.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Borage has fast growth, while Pencil Tree grows moderate.
💡 Pro Tips For Comparing These Plants
Borage Care Tips
Borage is primarily an outdoor plant that requires full sun and well-drained soil. Growing it indoors is challenging due to its high light requirements and potential for rapid growth. It is also toxic to pets, requiring careful placement if grown in a home with animals.
- Provide full sun for optimal growth and flowering.
- Water deeply but infrequently, allowing the soil to dry slightly between waterings.
- Fertilize regularly during the growing season with a balanced liquid fertilizer.
- Deadhead spent flowers to encourage more blooms.
- Monitor for pests and diseases, and treat promptly.
Pencil Tree Care Tips
Pencil Trees are relatively easy to care for outdoors in warm, arid climates. Indoors, they require very bright light and careful watering to avoid root rot. The toxic sap poses a risk to pets and humans, requiring careful handling. Maintaining adequate light levels indoors is the biggest challenge.
- Provide excellent drainage to prevent root rot.
- Allow the soil to dry out completely between waterings.
- Wear gloves and eye protection when handling the plant.
- Provide at least 6-8 hours of direct sunlight daily.
- Fertilize sparingly during the growing season.
⚠️ Common Problems & Solutions — Plant Care Comparison
Borage
Pencil Tree
❓ Frequently Asked Questions — Comparing These Plants
Borage
What are the light requirements for Borage?
Borage thrives in full sun, requiring at least six hours of direct sunlight per day to promote abundant flowering and healthy growth. While it can tolerate partial shade, insufficient light can lead to leggy growth, reduced flowering, and paler foliage. When growing Borage indoors, place it near a south-facing window where it can receive maximum sunlight. If natural light is limited, supplement with grow lights to ensure adequate illumination. Rotate the plant regularly to ensure even light exposure on all sides. Insufficient light can weaken the plant and make it more susceptible to pests and diseases.
How do I care for Borage?
Borage is generally easy to care for, thriving in well-draining soil and full sun to partial shade. Water regularly, especially during dry periods, but avoid overwatering to prevent root rot. Fertilize lightly with a balanced fertilizer in spring to encourage blooming, switching to a bloom-boosting fertilizer as flowers appear. Deadhead spent flowers to promote continuous blooming. Borage is relatively pest-resistant but watch for aphids and spider mites. Provide adequate air circulation to prevent fungal diseases. Borage can tolerate a range of temperatures but prefers moderate conditions. Indoors, ensure adequate light and humidity. Regularly inspect your Borage for any signs of stress or disease, and adjust your care routine accordingly.
How do I propagate Borage?
Borage can be propagated easily from seeds. Sow seeds directly into the garden in spring or fall, or start them indoors 6-8 weeks before the last frost. Borage can also self-seed readily. Root cuttings can also be taken in the spring. Select a healthy stem and cut it just below a node. Remove the lower leaves and place the cutting in water or directly into moist soil. Keep the soil moist and provide bright, indirect light until roots develop. Once rooted, transplant the cutting into a pot or garden bed. Division is not suitable for Borage due to its taproot system. Borage propagation is simple and rewarding!
Pencil Tree
What are the light requirements for Pencil Tree?
Pencil Tree requires bright, indirect sunlight to thrive. A location near a south-facing window is ideal. It can tolerate some direct sunlight, especially in the morning or late afternoon, but prolonged exposure to intense midday sun can scorch the branches. If your plant is not receiving enough light, the branches may become thin and leggy. Rotate the plant regularly to ensure even light exposure on all sides. During winter months, when light levels are lower, consider using a grow light to supplement the natural light. Adequate light is essential for maintaining the plant’s vibrant green color and healthy growth.
How do I care for Pencil Tree?
Pencil Tree thrives in bright, indirect sunlight; direct sun for several hours is ideal. Water thoroughly only when the soil is completely dry, typically every 2-4 weeks, and less frequently in winter. Use well-draining succulent potting mix to prevent root rot. Maintain temperatures between 65-85°F (18-29°C). Fertilize sparingly during the growing season (spring/summer) with a balanced, diluted succulent fertilizer. Repot every 2-3 years, or when the plant becomes root-bound. Be cautious of the milky sap, which can be irritating to skin and eyes; wear gloves when handling. Avoid overwatering to prevent issues.
How do I propagate Pencil Tree?
Pencil Tree can be easily propagated using stem cuttings. Allow the cut end of the stem to callus over for several days before planting it in well-draining succulent mix. Keep the soil slightly moist until roots develop, which typically takes several weeks. Offsets can be carefully separated from the main plant and planted in their own pots. Leaf cuttings are not a reliable method for Pencil Tree propagation. Always wear gloves when handling cuttings due to the irritating sap. Provide bright, indirect light during the propagation process.
Last updated: April 21, 2026 — Plant care data reviewed and verified by our editorial team.