How to Grow and Care for Purple Fountain Grass

Understanding Purple Fountain Grass

Purple fountain grass, scientifically known as Pennisetum setaceum ‘Rubrum’, is an herbaceous perennial favored for its striking appearance and ease of care. Native to Africa and Western Asia, this ornamental grass has adapted well in parts of Arizona and Southern California, often thriving in warmer climates. Its ability to naturalize in these regions makes it a versatile addition to many landscapes.

Physically, purple fountain grass is distinguished by long, arching leaves that are typically purple, red, or bronze in color. The foliage creates a dramatic, feathery effect, adding texture and movement to gardens.

The plant can reach a height of 3 to 5 feet, with a spread of about 2 to 4 feet, making it suitable for use in borders, mass plantings, or as a standout specimen. The delicate, plume-like flower spikes, which appear in late summer, enhance its ornamental value.

As a perennial, purple fountain grass follows a recurrent growth cycle that ensures it returns year after year. In regions with mild winters, it remains evergreen, while in cooler areas (below USDA hardiness zone 9), it may die back only to reemerge in spring.

Typically blooming in late summer, it reaches its full height during the growing season and may require some winter protection in colder climates to ensure its vitality.

5 Key Characteristics of Purple Fountain Grass

• Height: 3 to 5 feet tall
• Color: Purple, red, or bronze foliage
• Flowering Time: Late summer
• Native Regions: Africa and Western Asia
• Growth Habit: Perennial, adaptable in zones 9 and above

Planting Purple Fountain Grass

The best time to plant purple fountain grass is in the spring, once the danger of frost has passed. Planting after the last frost ensures that the grass can establish roots without the risk of frost damage. Early spring planting gives the plant the entire growing season to become established before facing winter conditions.

When planting purple fountain grass, start by preparing the soil. It thrives in well-draining soil with organic matter. Dig a hole twice as wide and as deep as the root ball of the plant. Position the plant in the hole so that the top of the root ball is level with the soil surface.

Fill the hole with soil and press down gently to eliminate air pockets. Water thoroughly to help settle the soil around the roots.

Spacing and light requirements are crucial for the healthy growth of purple fountain grass. Plant each grass about 3 feet apart to allow for their mature size and to ensure proper air circulation. This spacing helps prevent fungal diseases that can occur with poor air flow.

While it thrives in full sun, requiring at least six hours of direct sunlight each day, it can also tolerate partial shade. However, less sunlight may result in less vibrant foliage and fewer blooms.

5 Steps for Planting Purple Fountain Grass

• Choose a planting site that receives full sunlight for at least six hours a day.
• Prepare well-draining soil with added organic matter.
• Dig a hole twice as wide and as deep as the root ball.
• Place the plant in the hole, ensuring the top of the root ball is level with the soil surface.
• Fill the hole, press soil gently, and water thoroughly.

Soil Requirements for Purple Fountain Grass

Purple fountain grass thrives best in well-draining loamy soil. Loamy soil is rich in organic matter, providing the perfect balance of moisture retention and drainage.

This type of soil supports robust root development and optimal nutrient uptake, leading to healthy and vigorous growth. Regularly amending the soil with compost can further enhance its structure and fertility.

This versatile grass can also adapt to various soil types, including sandy or clay soils. While its preference lies with loamy soil, it demonstrates remarkable resilience in less-than-ideal conditions.

For sandy soil, incorporating organic matter can boost moisture retention. In contrast, for clay soil, breaking it up with organic material improves drainage and reduces compaction.

Climate plays a significant role in the growth and survival of purple fountain grass. It flourishes in summer temperatures between 75-85°F (24-29°C). However, it isn’t reliably perennial in climates below USDA zone 9.

In cooler regions, it may function more effectively as an annual or require measures such as mulching or winterizing to survive colder months.

Soil Type	Suitability
Loamy	Ideal for optimal growth
Sandy	Adaptable with added organic matter
Clay	Tolerable if amended for better drainage

Watering Purple Fountain Grass

Newly planted purple fountain grass needs regular watering to establish a strong root system. For the first few months, water once or twice a week, ensuring the soil receives about an inch of water each time. Allow the soil to dry out between watering sessions to prevent waterlogging. Proper moisture levels during this initial period are crucial for healthy growth.

Once established, the watering needs of purple fountain grass decrease. In regions with occasional rainfall, you may need to water less frequently.

Monitor the plant and soil conditions; if the soil feels dry about an inch below the surface, it’s time to water. Overwatering can lead to root rot, so balance is key to maintaining plant health.

Preventing overwatering is essential for the longevity of purple fountain grass. Ensure the planting site has well-draining soil to facilitate proper water flow.

Avoid using heavy clay soils without amendments, as they retain water and can cause root issues. In dry climates, consider using a mulch layer to retain soil moisture and reduce evaporation.

5 Tips for Proper Watering of Purple Fountain Grass

• Water once or twice a week during the initial growth phase.
• Ensure the soil dries between waterings.
• Reduce watering frequency once the plant is established.
• Use well-draining soil to prevent waterlogging.
• Apply mulch to retain moisture in dry climates.

Sunlight Needs for Purple Fountain Grass

Purple fountain grass thrives in full sunlight. This plant requires at least six to eight hours of bright light daily for optimal growth. Sufficient sunlight helps the grass develop vibrant foliage and robust blooms. Exposure to full sun is crucial for maintaining its striking color and overall health.

While purple fountain grass can tolerate partial shade, it is important to note that insufficient sunlight can adversely affect its growth. Under partial shade, the grass may exhibit less intense coloring and produce fewer flowers.

The plant may also grow more slowly and less vigorously compared to those in full sunlight. Ensuring as much sunlight as possible will maximize its ornamental value.

When positioning purple fountain grass in your garden, choose a location that receives ample sunlight throughout the day. Avoid planting it in areas with prolonged shade, such as under large trees or close to tall structures. Ideal spots include open borders, along pathways, or in areas of the garden that receive consistent sun exposure. Proper placement ensures the plant gets the necessary light to flourish.

5 Benefits of Providing Adequate Sunlight to Purple Fountain Grass

• Enhances vibrant foliage color
• Promotes robust blooms
• Encourages vigorous growth
• Maintains plant health
• Maximizes ornamental value

Fertilizing Purple Fountain Grass

Purple fountain grass can thrive without the need for additional fertilizing. However, applying a balanced 10-10-10 NPK fertilizer can enhance its growth and flowering. Fertilizing helps supply essential nutrients that may be missing from the soil, promoting robust foliage and more abundant blooms.

When choosing a fertilizer opt for a general-purpose, slow-release type. The slow-release formula ensures a steady supply of nutrients over time, minimizing the risk of nutrient burn and providing consistent support throughout the growing season. Balanced fertilizers, with equal parts nitrogen, phosphorus, and potassium, cater to the varied needs of the grass, aiding in overall plant health.

To develop a fertilizing schedule, start by applying fertilizer monthly during the summer months. This period aligns with the grass’s peak growing and blooming season, allowing for maximum benefit. Apply the fertilizer early in the morning or late in the evening to prevent evaporation and water it in thoroughly to ensure nutrients reach the roots effectively.

5 Steps for Fertilizing Purple Fountain Grass

• Select a balanced 10-10-10 NPK slow-release fertilizer.
• Apply the fertilizer monthly during the summer growing season.
• Spread the fertilizer evenly around the base of the plant.
• Water the area thoroughly after applying fertilizer.
• Monitor the plant for signs of nutrient deficiencies or over-fertilizing.

Pruning Purple Fountain Grass

Regular pruning of purple fountain grass is crucial for maintaining its decorative appeal and overall health. By trimming down the foliage, you ensure the removal of dead or damaged leaves, which can harbor pests and diseases. Pruning also stimulates new growth, helping the plant retain its attractive and vibrant appearance throughout the growing season.

The best time to prune purple fountain grass is in late winter or early spring. Pruning during this period allows you to remove any foliage that has died back over the winter, making way for fresh new growth as the warm season begins. Cutting back the plant to about 3 inches above the ground at this time encourages it to bounce back vigorously, setting the stage for a lush and healthy display.

Effective pruning techniques are essential for ensuring your fountain grass remains in top condition. Start by using sharp, clean pruning shears to make clean cuts at the base of the grass stalks. Remove any dead or damaged leaves first, then cut back the entire plant to approximately 3 inches above ground level. Performing light shaping and removing any dead foliage throughout the year helps maintain its neat and tidy appearance.

5 Tips for Effective Pruning of Purple Fountain Grass

• Prune in late winter or early spring for best results.
• Use sharp, clean pruning shears to avoid disease transmission.
• Cut back all the foliage to about 3 inches above the ground.
• Remove dead or damaged leaves first to assess the plant’s shape better.
• Perform light shaping and remove dead foliage throughout the year as needed.

Propagating Purple Fountain Grass

Propagation of this versatile ornamental grass can be efficiently executed through division or from seeds, ensuring a lush and vibrant display in your garden.

Propagation through division is the recommended method due to its reliability and simplicity. The ideal times for division are early spring and fall when the plant is not actively growing. Begin by digging up the parent plant carefully to avoid damaging the root system.

Shake off excess soil and use a sharp, clean knife or spade to divide the root ball into smaller sections, each with a few shoots and a healthy root system. Replant the divisions immediately, ensuring they are spaced adequately to accommodate future growth. Water well to help the new plants establish.

Propagation from seeds provides an alternative method, allowing for the creation of additional plants. Collect seeds from mature flower spikes in the fall once they have dried on the plant. Sow the seeds in well-draining soil and cover them lightly. Keep the soil consistently moist but not waterlogged.

Place the seed trays in a warm, sunny location. Germination may take several weeks, and the young seedlings should be transplanted into individual pots once they are large enough to handle. Gradually acclimate them to outdoor conditions before planting them in the garden.

Rejuvenating older clumps of purple fountain grass can maintain their vigor and appearance. Over time, the center of the plant may become less productive. To rejuvenate, dig up the older grass clump in spring or fall and remove any dead or decaying parts. Divide the healthy outer sections and replant them. This process not only revitalizes the grass but also encourages new growth and optimal plant health.

5 Steps for Propagating Purple Fountain Grass Through Division

• Carefully dig up the parent plant.
• Shake off excess soil and divide the root ball with a clean knife or spade.
• Ensure each division has shoots and a healthy root system.
• Replant divisions with adequate spacing.
• Water the new plants thoroughly to help them establish.

Seasonal Care for Purple Fountain Grass

During the growing season of spring and summer, purple fountain grass requires regular attention to flourish. Ensure the soil remains consistently moist but not waterlogged, and water the plant more frequently during dry spells. Additionally, applying a layer of mulch can help retain moisture and regulate soil temperature. Regularly fertilize with a balanced slow-release fertilizer to support robust growth and vibrant blooms. Monitor for any signs of pests or diseases, addressing issues promptly to keep the plant healthy.

In autumn, it’s crucial to prepare purple fountain grass for the upcoming winter, especially in regions prone to cold weather. Gradually reduce watering as the temperature drops, but keep the soil slightly moist to prevent it from drying out completely.

Cutting back the foliage to about 3 inches tall will help the plant conserve energy and reduce the risk of winter damage. Apply a thick layer of mulch around the base of the grass to insulate the roots and protect them from freezing temperatures.

Winter care for purple fountain grass is essential in colder climates (zones 8 and below), where the grass may not survive the harsh conditions outdoors. Overwintering involves carefully digging up the plant and transferring it to a container.

Place the container in a cool, sheltered area such as a garage or basement, where temperatures remain above freezing. Ensure the plant receives minimal water during this dormancy period, just enough to keep the roots from drying out completely. In early spring, replant the grass outdoors once the threat of frost has passed.

5 Seasonal Care Tips for Purple Fountain Grass

• Spring and Summer:
  • Keep the soil consistently moist but not waterlogged.
  • Use mulch to retain moisture and regulate soil temperature.
  • Fertilize regularly with a balanced slow-release fertilizer.
  • Monitor for pests and diseases, addressing issues promptly.
• Autumn:
  • Gradually reduce watering.
  • Cut back foliage to about 3 inches tall.
  • Apply a thick layer of mulch to insulate the roots.
• Winter:
  • Overwinter by digging up the plant and placing it in a container.
  • Keep the container in a cool, sheltered area above freezing.
  • Water minimally during the dormancy period.

Common Pests and Diseases of Purple Fountain Grass

Purple fountain grass is generally resistant to most pests, but there are a few that might cause issues.

Common Pests

Aphids are small, sap-sucking insects that can cluster on the stems and leaves, causing the foliage to look distorted or stunted. Spider mites are another pest to watch for; these tiny arachnids can cause yellowing leaves and fine webbing on the plant.

Caterpillars, including armyworms, may chew on the foliage, leading to ragged edges or holes. Regular inspections are crucial for spotting these pests early, so you can take prompt action.

Common Diseases

While relatively disease-resistant, purple fountain grass can be affected by rust and leaf spot. Rust appears as small, reddish-brown pustules on the leaves, while leaf spot manifests as round, discolored patches that may lead to leaf drop.

Both conditions can be exacerbated by poor air circulation and prolonged periods of moisture on the leaves, making proper spacing and irrigation techniques essential.

Prevention and Treatment

Maintaining plant health is the first line of defense against pests and diseases. Ensure your purple fountain grass is planted with adequate spacing to promote good air flow.

Water the base of the plant rather than the foliage to keep leaves dry. Apply organic mulches to regulate soil moisture and temperature, reducing stress on the plant.

If pests or disease symptoms do appear, consider organic treatments first. Insecticidal soaps or neem oil can be effective against aphids and spider mites.

For rust and leaf spot, remove and destroy affected leaves to prevent the spread. Fungicides can be used as a last resort, but ensuring optimal growing conditions is generally the best preventive measure.

5 Common Pests and Diseases of Purple Fountain Grass

• Aphids: Causes distorted, stunted foliage
• Spider Mites: Leads to yellowing leaves and webbing
• Caterpillars: Results in ragged edges and holes in leaves
• Rust: Displays as reddish-brown pustules on leaves
• Leaf Spot: Causes round, discolored patches and leaf drop

Using Purple Fountain Grass in Garden Design

Incorporating purple fountain grass into your garden design brings numerous benefits. Its aesthetic appeal lies in its vibrant colors and graceful arching form, which adds visual interest and dynamic movement to any landscape.

This grass is also highly versatile, fitting seamlessly into a variety of garden styles from modern to cottage. Its drought tolerance and low maintenance make it an excellent choice for busy gardeners seeking a striking yet practical plant.

Creative design ideas for using purple fountain grass can transform your garden into a stunning visual display. Utilize this plant to create eye-catching borders around patios, walkways, or garden beds.

Its tall, feathery plumes make it an ideal choice for privacy screens, offering both beauty and function. When planted in mixed borders, it provides a lush backdrop for colorful perennials and serves as a contrast to the textures of shorter plants.

Practical tips for planting purple fountain grass will help ensure it integrates well with other plants. Position it in areas that receive full sun for at least six hours a day to achieve the best color and growth.

Combine it with other drought-tolerant species such as lavender, salvia, and ornamental sage for a harmonious and water-wise garden. When planning your garden layout, consider the mature height and spread of the grass to allow enough space for it to thrive without overcrowding its companions.

5 Garden Design Ideas Using Purple Fountain Grass

• Borders: Define the edges of walkways or garden beds.
• Privacy Screens: Use its height for natural screening.
• Mixed Borders: Combine with colorful perennials for striking contrast.
• Containers: Enhance patios and balconies with potted arrangements.
• Accent Plant: Use as a focal point in the garden to draw the eye.

Final Thoughts on How to Grow and Care for Purple Fountain Grass

Successful growing and care for purple fountain grass involves understanding its specific needs. By following the guidelines in this article, you will be assured of growing this very lovely ornamental grass.

With its stunning purple coloring, you will be able to add vibrant, dynamic beauty to your garden.

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