Pennisetum vs Princess Tree Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Pennisetum
Pennisetum setaceum
Pennisetum setaceum is a perennial bunchgrass known for its graceful, arching foliage and bottlebrush-like flower spikes. Typically grown as an ornamental grass, it adds texture and movement to landscapes. The foliage can range from green to reddish-purple, with the flower plumes often appearing in shades of pink, purple, or white. It is primarily an outdoor plant, thriving in full sun and well-drained soil. People grow it for its aesthetic appeal, drought tolerance, and ability to attract birds.
Princess Tree
Paulownia tomentosa
Paulownia tomentosa, the Princess Tree, is a deciduous tree known for its rapid growth and large, heart-shaped leaves. It can reach heights of 30-60 feet. In spring, it produces fragrant, pale purple flowers in panicles before the leaves emerge. These are followed by persistent seed capsules. While admired for its ornamental value, it's considered invasive in many regions due to its prolific seed production and ability to resprout from roots. It is primarily an outdoor tree and not suitable for indoor cultivation.
Quick Plant Comparison
| Feature | Pennisetum | Princess Tree |
|---|---|---|
| Light | Full sun (at least 6-8 hours of direct sunlight daily) | Full sun |
| Watering | Every 1-2 weeks, depending on weather and soil drainage | Once or twice a week during the growing season, less frequently during dormancy. |
| Humidity | 30-50% | 30-50% |
| Temperature | 18-30°C | 15-27°C |
| Care Level | Expert | Expert |
| Growth Rate | Moderate | Fast |
| Max Height | Rarely grown indoors, outdoor height up to 1.2 meters | Not applicable - unsuitable for indoor growing. Outdoors: 9-18 meters |
| Pet Safety | ✅ Safe | ❌ Toxic To Pets |
| Soil | Well-drained soil, sandy or loamy | Well-draining soil, adaptable to various soil types including clay, loam, and sand. |
| Beginner Friendly | ❌ No | ❌ No |
| Weekly Maintenance | 15 minutes weekly | 1-2 hours per month, primarily for pruning and managing spread. |
🔬 Botanical Information — Comparing These Plants
Pennisetum
| Scientific Name | Pennisetum setaceum |
|---|---|
| Family | Poaceae |
| Native To | Tropical Africa, Southwest Asia, Arabian Peninsula |
| Also Known As | Crimson Fountaingrass, Purple Fountaingrass |
| Leaves | The leaves are long, narrow, and grass-like, typically green but can range to reddish-purple in some cultivars like 'Rubrum'. They have a slightly rough texture and arch gracefully. |
| Flowers | It rarely flowers indoors. Outdoors, it produces bottlebrush-like flower spikes in shades of pink, purple, or white. The flowers are feathery and add to the plant's ornamental appeal. |
Princess Tree
| Scientific Name | Paulownia tomentosa |
|---|---|
| Family | Paulowniaceae |
| Native To | Central and Western China |
| Also Known As | Princess Tree, Empress Tree, Foxglove Tree |
| Leaves | The leaves are large, heart-shaped (cordate), and can reach up to 12 inches in length. They are typically a medium green color and have a slightly fuzzy texture when young. |
| Flowers | It rarely, if ever, flowers indoors. Outdoors, it produces large panicles of fragrant, pale purple flowers in spring before the leaves emerge. |
📏 Size & Growth — Plant Comparison
Pennisetum
Princess Tree
🌱 Propagation — Comparing Plant Growth
Pennisetum
Methods: Seed, Division
Difficulty: Easy
Tips: Divide clumps in spring or fall. Sow seeds in spring after the last frost.
Princess Tree
Methods: Seeds, root cuttings, stem cuttings
Difficulty: Moderate
Tips: For seeds, cold stratify for several weeks before sowing. Root cuttings should be taken in late winter. Stem cuttings can be taken in summer.
✨ Benefits & Features — Comparing Plant Value
Pennisetum
Its bottlebrush-like flower spikes and arching foliage create a graceful and dynamic appearance. The 'Rubrum' cultivar offers striking reddish-purple foliage, adding a unique color element to landscapes. It is also drought-tolerant once established.
- ✓ Adds visual interest to gardens
- ✓ Provides habitat for birds
- ✓ Drought-tolerant, reducing water consumption
- ✓ Low maintenance once established
- ✓ Erosion control on slopes
- 🐾 Pet Safe
Princess Tree
Its rapid growth rate and large leaves distinguish it from many other trees. The fragrant spring flowers are also a notable feature. However, its invasive nature is a significant consideration.
- ✓ Provides shade in large outdoor spaces.
- ✓ Offers fragrant spring flowers.
- ✓ Attracts pollinators.
- ✓ Provides habitat for wildlife.
- ✓ Can be used for erosion control on slopes.
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Pennisetum
Princess Tree
🌞 Light Requirements
Pennisetum
Full sun (at least 6-8 hours of direct sunlight daily)
Low light tolerant: ❌ No
Princess Tree
Full sun
Low light tolerant: ❌ No
💧 Watering Needs
Pennisetum
Water deeply when the top inch of soil feels dry. Avoid overwatering, as this can lead to root rot. In containers, ensure proper drainage. During the growing season, water more frequently. Reduce watering in the winter.
Princess Tree
Water deeply when the topsoil feels dry to the touch, especially during the growing season. Avoid overwatering, which can lead to root rot. Reduce watering in the dormant season. Signs of underwatering include wilting leaves; overwatering includes yellowing leaves and soggy soil.
🌡️ Temperature & Humidity
Pennisetum
Temperature: 18-30°C
Humidity: 30-50%
Princess Tree
Temperature: 15-27°C
Humidity: 30-50%
🤔 Which Plant Is Right For You?
Pennisetum
Pennisetum setaceumGardeners looking for drought-tolerant ornamental grasses for sunny locations.
✅ Choose This Plant If...
- It adds beautiful texture and movement to gardens
- It is drought-tolerant once established
- It attracts birds to the garden
- The 'Rubrum' cultivar provides striking reddish-purple foliage
- It is relatively low-maintenance once established.
❌ Skip This Plant If...
- It requires full sun and will not thrive indoors
- It can be invasive in some regions
- It needs well-drained soil and is susceptible to root rot if overwatered.
Princess Tree
Paulownia tomentosaLandowners with large properties in non-invasive regions who appreciate fast-growing shade trees with showy spring flowers.
✅ Choose This Plant If...
- You have a large outdoor space and want a fast-growing shade tree.
- You appreciate fragrant spring flowers.
- You are prepared to manage its potentially invasive nature.
- You want a tree that can tolerate a variety of soil conditions.
- You are looking for a tree that provides habitat for wildlife.
❌ Skip This Plant If...
- You have a small garden or limited space.
- You live in a region where it is considered invasive.
- You are not prepared to manage its rapid growth and spread.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Pennisetum needs full sun (at least 6-8 hours of direct sunlight daily), while Princess Tree prefers full sun.
Pennisetum has moderate growth, while Princess Tree grows fast.
💡 Pro Tips For Comparing These Plants
Pennisetum Care Tips
Pennisetum setaceum is primarily an outdoor plant and is difficult to grow indoors due to its high light requirements. It needs full sun and well-drained soil. Overwintering indoors is possible in very bright locations, but plant will likely decline.
- Plant in well-drained soil to prevent root rot.
- Provide full sun for optimal growth and color.
- Cut back foliage in late winter or early spring.
- Monitor for pests and diseases regularly.
- Avoid over-fertilizing, as this can lead to excessive growth.
Princess Tree Care Tips
Paulownia tomentosa is an outdoor tree that requires full sun and well-draining soil. It is not suitable for indoor cultivation due to its size and light requirements. It is considered invasive in many areas, requiring careful management to prevent its spread.
- Monitor for invasive spread and remove seedlings promptly.
- Prune regularly to maintain shape and remove dead or damaged branches.
- Water deeply during dry periods, especially when young.
- Fertilize in early spring with a balanced fertilizer.
- Protect young trees from strong winds.
⚠️ Common Problems & Solutions — Plant Care Comparison
Pennisetum
Princess Tree
❓ Frequently Asked Questions — Comparing These Plants
Pennisetum
What are the light requirements for Pennisetum?
Pennisetum requires at least 6-8 hours of direct sunlight per day to thrive and produce abundant flower plumes. Insufficient light can result in leggy growth, reduced flowering, and faded foliage color. When planting Pennisetum in the landscape, choose a location that receives full sun exposure throughout the day. If growing Pennisetum in containers, place them in a sunny spot on a patio or balcony. South-facing exposures are typically ideal. If you notice your Pennisetum is not flowering as expected, or if the foliage appears pale, consider moving it to a sunnier location. Supplemental lighting may be necessary in regions with short growing seasons or limited sunlight.
How do I care for Pennisetum?
Pennisetum thrives in full sun and well-draining soil. Water deeply but infrequently, allowing the soil to dry out slightly between waterings, especially once established. Fertilize in spring with a balanced, slow-release fertilizer to promote healthy growth and abundant blooms. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowering. Prune back the foliage in late winter or early spring before new growth emerges. Remove any dead or damaged leaves throughout the growing season. Pennisetum is generally drought-tolerant once established but benefits from occasional watering during prolonged dry periods. Monitor for pests such as aphids or spider mites and treat accordingly. Provide adequate air circulation to prevent fungal diseases. Mulch around the base of the plant to help retain moisture and suppress weeds.
How do I propagate Pennisetum?
Pennisetum can be propagated by division or seed. Division is best done in spring. Dig up the plant and gently separate the root ball into smaller clumps, ensuring each clump has healthy roots and foliage. Replant the divisions in well-draining soil. To propagate by seed, sow seeds indoors in early spring or directly outdoors after the last frost. Keep the soil moist until germination occurs. Stem cuttings are not a common propagation method for Pennisetum. Keikis are not applicable as Pennisetum does not produce them. Provide ample sunlight and water regularly. Seedlings should be hardened off before transplanting outdoors.
Princess Tree
What are the light requirements for Princess Tree?
Princess Tree thrives in bright, indirect light. Insufficient light can lead to leggy growth and reduced leaf size. Place your Princess Tree near a sunny window, ideally facing east or west. If you only have a south-facing window, filter the light with a sheer curtain to prevent scorching. Rotate the plant regularly to ensure even light exposure on all sides. If natural light is limited, consider supplementing with artificial grow lights to provide the necessary light intensity. Pale leaves or slow growth can indicate insufficient light.
How do I care for Princess Tree?
To successfully grow Princess Tree indoors, provide it with bright, indirect light; direct sunlight can scorch the leaves. Water thoroughly when the top inch of soil feels dry, ensuring good drainage to prevent root rot. Maintain moderate humidity levels, especially during the winter months when indoor air tends to be drier. Fertilize regularly during the growing season (spring and summer) with a balanced liquid fertilizer diluted to half strength. Repot the plant every 1-2 years, or when it becomes root-bound, using a well-draining potting mix. Prune as needed to maintain shape and remove any dead or damaged leaves. Monitor for pests such as spider mites and aphids, and treat promptly with insecticidal soap or neem oil. Maintain stable temperatures, avoiding drastic fluctuations.
How do I propagate Princess Tree?
Princess Tree can be propagated through stem cuttings and air layering.
Last updated: April 24, 2026 — Plant care data reviewed and verified by our editorial team.