Purple Fountain Grass vs Salvia Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Purple Fountain Grass
Pennisetum setaceum 'Rubrum'
Purple Fountain Grass is a striking ornamental grass prized for its arching, burgundy-purple foliage and bottlebrush-like flower plumes. It typically grows in a mounded form, reaching several feet in height and width. While technically a perennial in warmer climates, it is often grown as an annual in cooler regions due to its sensitivity to frost. It is primarily an outdoor plant, grown for its dramatic texture and color in gardens and landscapes. People grow it for its ornamental value, adding movement and visual interest to borders, containers, and mass plantings.
Salvia
Salvia officinalis
Salvia officinalis, commonly known as sage, is a perennial evergreen subshrub with woody stems, grayish leaves, and blue to purplish flowers. It is native to the Mediterranean region but cultivated worldwide for its culinary and medicinal properties. Sage typically grows to a height of 1-2 feet and spreads similarly. While primarily an outdoor plant, it can be grown indoors with sufficient light and proper care. People grow sage for its aromatic leaves, which are used as a flavoring in cooking, and for its purported health benefits.
Quick Plant Comparison
| Feature | Purple Fountain Grass | Salvia |
|---|---|---|
| Light | Full sun (at least 6 hours of direct sunlight per day) | Full sun to partial shade. Requires at least 6 hours of direct sunlight daily for optimal growth and flowering. |
| Watering | Every 7-10 days, depending on weather and soil drainage | Every 1-2 weeks, depending on environmental conditions and pot size. |
| Humidity | 20-50% | 40-60% |
| Temperature | 18-30°C | 18-24°C |
| Care Level | Expert | Expert |
| Growth Rate | Moderate | Moderate |
| Max Height | Outdoor: 0.6-1.5 meters. Indoor (unlikely to thrive): 0.3-0.6 meters | 0.3-0.6 meters (indoors) |
| Pet Safety | ✅ Safe | ❌ Toxic To Pets |
| Soil | Well-draining soil, such as a sandy loam or a potting mix amended with perlite | Well-draining soil, such as a mix of potting soil, perlite, and sand. |
| Beginner Friendly | ❌ No | ❌ No |
| Weekly Maintenance | 15 minutes weekly | 15 minutes weekly |
🔬 Botanical Information — Comparing These Plants
Purple Fountain Grass
| Scientific Name | Pennisetum setaceum 'Rubrum' |
|---|---|
| Family | Poaceae |
| Native To | Hybrid cultivar; species native to Africa, Southwest Asia |
| Also Known As | Purple Fountain Grass, Red Fountain Grass |
| Leaves | The leaves are long, narrow, and arching, with a deep burgundy-purple color. They have a fine texture and create a graceful, flowing appearance. |
| Flowers | It produces bottlebrush-like flower plumes that are initially a deep burgundy-purple, fading to a tan color as they mature. Flowering typically occurs in summer and fall. It is unlikely to flower indoors. |
Salvia
| Scientific Name | Salvia officinalis |
|---|---|
| Family | Lamiaceae |
| Native To | Mediterranean region |
| Also Known As | Sage, Common Sage, Garden Sage |
| Leaves | The leaves of Salvia officinalis are oblong to lance-shaped, typically 2-5 cm long and 1-2 cm wide. They are grayish-green in color and have a slightly rough, textured surface due to fine hairs. The leaves are strongly aromatic when crushed. |
| Flowers | Sage can flower indoors under optimal conditions, but it is more common outdoors. The flowers are typically blue to purplish, but can also be pink or white. They are arranged in spikes and attract pollinators. |
📏 Size & Growth — Plant Comparison
Purple Fountain Grass
Salvia
🌱 Propagation — Comparing Plant Growth
Purple Fountain Grass
Methods: Seed, Division
Difficulty: Moderate
Tips: Divide clumps in spring or early summer. Sow seeds indoors 6-8 weeks before the last frost.
Salvia
Methods: Stem cuttings, Seed, Layering, Division
Difficulty: Easy
Tips: Take stem cuttings in spring or summer. Dip the cut end in rooting hormone and plant in moist potting mix. Keep the cuttings in a warm, humid environment until roots develop.
✨ Benefits & Features — Comparing Plant Value
Purple Fountain Grass
Its deep purple foliage and graceful, arching habit make it a standout in any garden. The bottlebrush-like flower plumes add further visual interest and movement.
- ✓ Adds visual interest and texture to the garden
- ✓ Attracts birds
- ✓ Drought tolerant
- ✓ Deer resistant
- ✓ Provides movement in the landscape
- 🐾 Pet Safe
Salvia
Salvia officinalis is known for its distinctive aroma and flavor, making it a popular culinary herb. Its grayish-green leaves are also visually appealing. While many Salvia species exist, Salvia officinalis is the most commonly cultivated for culinary and medicinal purposes.
- ✓ Provides fresh herbs for cooking.
- ✓ Adds a pleasant aroma to the home.
- ✓ May offer traditional medicinal benefits.
- ✓ Attractive foliage adds visual interest.
- ✓ Relatively low-maintenance once established.
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Purple Fountain Grass
Salvia
🌞 Light Requirements
Purple Fountain Grass
Full sun (at least 6 hours of direct sunlight per day)
Low light tolerant: ❌ No
Salvia
Full sun to partial shade. Requires at least 6 hours of direct sunlight daily for optimal growth and flowering.
Low light tolerant: ❌ No
💧 Watering Needs
Purple Fountain Grass
Water deeply when the top inch of soil feels dry to the touch. Avoid overwatering, which can lead to root rot. Signs of underwatering include drooping or browning leaves. Signs of overwatering include yellowing leaves and soggy soil.
Salvia
Water thoroughly when the top inch of soil feels dry to the touch. Avoid overwatering, as sage is susceptible to root rot. Signs of overwatering include yellowing leaves and a musty smell. Underwatering is indicated by wilting and dry, crispy leaves.
🌡️ Temperature & Humidity
Purple Fountain Grass
Temperature: 18-30°C
Humidity: 20-50%
Salvia
Temperature: 18-24°C
Humidity: 40-60%
🤔 Which Plant Is Right For You?
Purple Fountain Grass
Pennisetum setaceum 'Rubrum'Gardeners looking for a dramatic ornamental grass to add color and texture to their landscape.
✅ Choose This Plant If...
- You want a striking focal point in your garden.
- You need a drought-tolerant plant for a sunny location.
- You desire a plant with beautiful purple foliage and plumes.
- You want to attract birds to your garden.
- You need a deer-resistant plant.
❌ Skip This Plant If...
- You live in a cold climate and don't want to treat it as an annual.
- You don't have a sunny location.
- You are looking for a low-maintenance indoor plant.
Salvia
Salvia officinalisExperienced gardeners who want to grow culinary herbs indoors and can provide adequate light and care.
✅ Choose This Plant If...
- You enjoy cooking with fresh herbs and want to grow your own sage indoors.
- You have experience growing herbs and can provide the necessary light and care.
- You appreciate the aromatic foliage and potential medicinal benefits of sage.
- You want a relatively low-maintenance plant once established.
- You have a sunny windowsill or can provide supplemental grow lights.
❌ Skip This Plant If...
- You have pets (dogs, cats, or horses) who may ingest the plant.
- You cannot provide sufficient sunlight or supplemental grow lights.
- You are a beginner gardener and prefer easier-to-grow indoor plants.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Both plants have similar basic care requirements but differ in appearance and specific needs. Compare plants carefully to find the best fit for your space.
💡 Pro Tips For Comparing These Plants
Purple Fountain Grass Care Tips
Purple Fountain Grass is primarily an outdoor plant and will struggle indoors due to its high light requirements. It needs full sun and well-draining soil. While it can be grown in containers, it requires regular watering and fertilization. Overwintering indoors is possible in colder climates, but the plant may not thrive.
- Plant in well-draining soil in a sunny location.
- Water deeply but infrequently, allowing the soil to dry out between waterings.
- Fertilize in spring with a balanced slow-release fertilizer.
- Cut back foliage in late fall or early spring.
- Protect from frost in colder climates.
Salvia Care Tips
Sage is primarily an outdoor plant and requires significant sunlight to thrive. Growing it indoors can be challenging due to insufficient light. Supplemental grow lights are often necessary. Proper watering and well-draining soil are crucial to prevent root rot. It is also toxic to pets.
- Provide at least 6 hours of direct sunlight or supplement with grow lights.
- Water thoroughly when the top inch of soil is dry, but avoid overwatering.
- Prune regularly to maintain shape and encourage bushier growth.
- Fertilize every 4-6 weeks during the growing season.
- Monitor for pests and diseases and treat promptly.
⚠️ Common Problems & Solutions — Plant Care Comparison
Purple Fountain Grass
Salvia
❓ Frequently Asked Questions — Comparing These Plants
Purple Fountain Grass
What are the light requirements for Purple Fountain Grass?
Purple Fountain Grass requires at least 6-8 hours of direct sunlight per day to thrive and develop its characteristic vibrant purple foliage and abundant flower plumes. Insufficient sunlight can lead to leggy growth, faded color, and reduced flowering. When planting, choose a location that receives full sun throughout the day. If growing in containers, rotate the plant regularly to ensure even sun exposure on all sides. In hotter climates, some afternoon shade may be beneficial to prevent scorching, but avoid placing it in deep shade, which will hinder its growth. Supplemental lighting may be necessary if grown indoors during winter months.
How do I care for Purple Fountain Grass?
Purple Fountain Grass thrives in full sun and well-draining soil. Water thoroughly when the top inch of soil feels dry, but avoid overwatering, which can lead to root rot. Fertilize monthly during the growing season (spring and summer) with a balanced fertilizer to promote healthy growth and vibrant blooms. Prune away dead or damaged foliage in late winter or early spring before new growth emerges. In colder climates, treat it as an annual or bring it indoors during the winter. Provide adequate air circulation to prevent fungal diseases. Regularly inspect for pests like aphids or spider mites, and treat accordingly. Avoid planting in overly compacted or poorly draining soil. Mulching around the base can help retain moisture and suppress weeds. Protect from strong winds.
How do I propagate Purple Fountain Grass?
Purple Fountain Grass can be propagated by division. In early spring, carefully dig up the plant and divide the root ball into smaller clumps, ensuring each clump has healthy roots and foliage. Replant the divisions in well-draining soil and water thoroughly. Keep the soil consistently moist until the new plants are established. Division is the most reliable method. Seed propagation is possible but can be inconsistent in producing plants true to the ‘Rubrum’ cultivar. Stem cuttings are not typically used for propagating this grass. Keikis are not applicable as this plant doesn’t produce them. Ensure good air circulation to prevent fungal diseases after dividing.
Salvia
What are the light requirements for Salvia?
Salvia requires ample sunlight to thrive and produce abundant blooms. Ideally, provide at least 6-8 hours of direct sunlight per day. A south-facing window is often the best location for indoor Salvia. 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. When transitioning Salvia from indoors to outdoors, gradually acclimate it to the increased sunlight to prevent leaf burn. In hot climates, provide some afternoon shade to protect the plant from excessive heat stress. Monitor the plant for signs of light stress, such as pale leaves or elongated stems.
How do I care for Salvia?
Salvia thrives in well-draining soil and requires regular watering, allowing the soil to dry slightly between waterings. Provide ample sunlight, ideally 6-8 hours of direct sunlight per day, to encourage abundant blooms. Fertilize Salvia regularly during the growing season (spring to fall) with a balanced fertilizer or one specifically formulated for flowering plants. Deadhead spent flowers to promote continuous blooming and prevent seed production. Prune Salvia in early spring to maintain its shape and encourage bushier growth. Protect Salvia from frost in colder climates, either by moving potted plants indoors or providing adequate insulation for garden plants. Monitor for pests such as aphids or whiteflies and treat as needed with insecticidal soap or neem oil. Ensure good air circulation to prevent fungal diseases. Choose a pot with drainage holes to avoid root rot.
How do I propagate Salvia?
Salvia can be propagated through division, stem cuttings, and in some cases, from seed. For division, carefully dig up the plant in spring or fall and separate the roots into smaller clumps, ensuring each clump has healthy roots and foliage. Replant the divisions in well-draining soil. For stem cuttings, take 4-6 inch cuttings from healthy stems in spring or summer. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cuttings in a well-draining propagation mix and keep them moist. Rooting typically occurs within a few weeks. Salvia does not produce keiki. Transplant rooted cuttings into individual pots once they have developed a strong root system. Provide adequate light and water to ensure successful establishment.
Last updated: May 4, 2026 — Plant care data reviewed and verified by our editorial team.