Feather Reed Grass (Calamagrostis X Acutiflora ‘Karl Foerster’)

Plant: Table of Contents

Feather Reed Grass (Calamagrostis x acutiflora ‘Karl Foerster’)

Feather reed grass, scientifically known as Calamagrostis x acutiflora ‘Karl Foerster’, is a perennial ornamental grass that has gained immense popularity among gardeners and landscapers for its striking appearance and low maintenance requirements. This article serves as a comprehensive guide to understand the culture, uses, maintenance, and propagation of feather reed grass. Whether you are a gardening enthusiast, a landscaping professional, or someone looking to enhance the beauty of your outdoor space, this detailed exploration of feather reed grass will provide you with valuable insights into integrating this beautiful ornamental grass into your landscape.

What is Feather Reed Grass?

Feather reed grass belongs to the grass family (Poaceae) and is a hybrid of two species, Calamagrostis arundinacea and Calamagrostis epigejos. The ‘Karl Foerster’ cultivar, named after the renowned German horticulturist Karl Foerster, is particularly favored for its strong, upright growth habit, making it a stunning focal point in gardens and landscapes.

Key Takeaways – Feather Reed Grass (Calamagrostis x acutiflora ‘Karl Foerster’)

  • Scientific Name: Calamagrostis x acutiflora ‘Karl Foerster’
  • Common Name: Feather Reed Grass
  • Family: Poaceae
  • Cultivar: ‘Karl Foerster’
  • Type: Perennial Ornamental Grass
  • Hardiness Zones: 5-9
  • Mature Height: 4-5 feet
  • Characteristics: Upright growth habit, feathery flower plumes, and attractive winter interest
  • Uses: Landscaping, erosion control, privacy screening, and as a cut flower
  • Maintenance: Low maintenance, minimal pruning requirements
  • Sunlight: Full sun to partial shade
  • Water: Moderate water requirements
  • Soil: Well-draining, adaptable to various soil types
  • Propagation: Division in spring
  • Common Diseases: Rust, leaf spots
  • Common Pests: Aphids, spider mites

Now, let’s delve into the intricate details of the culture, uses, and maintenance requirements of feather reed grass.


Understanding the specific cultural requirements of feather reed grass is essential for its successful growth and development. The following factors play a pivotal role in ensuring the health and vitality of this stunning ornamental grass.


Feather reed grass thrives in full sun to partial shade. It performs best when exposed to at least 6 hours of direct sunlight each day. In regions with intense summer heat, providing some afternoon shade can help prevent the foliage from scorching.


While feather reed grass exhibits moderate drought tolerance once established, regular watering is essential, especially during the initial establishment period. Deep, infrequent watering is preferred over frequent shallow irrigation to encourage deep root development and overall plant resilience.


One of the remarkable attributes of feather reed grass is its adaptability to a wide range of soil types. It thrives in well-draining soil but can tolerate both moist and moderately dry conditions. Moreover, it showcases remarkable resilience in clay and sandy soils, making it a versatile choice for various garden settings.


Feather reed grass typically does not have high fertilizer requirements. However, incorporating a balanced, slow-release fertilizer in early spring can promote vigorous growth and robust flowering. Opt for a fertilizer with a nutrient ratio of 10-10-10 or similar, and apply it according to the manufacturer’s guidelines.


The versatility of feather reed grass makes it a valuable addition to diverse landscaping and gardening applications. Its ornamental appeal, coupled with its functional attributes, renders it an invaluable asset in creating visually stunning and purposeful outdoor spaces.


Feather reed grass is widely utilized in landscaping for its ability to add vertical interest and textural contrast to garden beds and borders. Whether used as a standalone specimen, in mass plantings, or as a backdrop for flowering perennials, its elegant plumes and upright form create a dynamic visual impact throughout the seasons.

Erosion Control

The extensive root system of feather reed grass makes it an excellent choice for stabilizing soil and preventing erosion on slopes and embankments. When planted in strategic locations, this grass effectively anchors the soil, minimizing the risk of erosion due to water runoff and wind.

Privacy Screening

Due to its tall, densely clustered growth habit, feather reed grass serves as an effective natural privacy screen in residential landscapes. When planted in groups or rows, it provides a visually appealing and low-maintenance alternative to traditional fencing or hedges.

Cut Flower

The feathery plumes of feather reed grass make exquisite additions to cut flower arrangements and floral displays. Whether used fresh or dried, the airy, vertical structure of the inflorescences lends a touch of elegance and sophistication to floral compositions.


Pruning plays a crucial role in maintaining the health, aesthetics, and longevity of feather reed grass. Appropriate pruning techniques contribute to the renewal of growth and the prevention of overcrowding, ensuring the continued vitality of the plant.

Pruning Timing

The best time to perform pruning on feather reed grass is in late winter to early spring, before new growth emerges. This allows for the removal of dead or dormant foliage and facilitates the regrowth of fresh, vibrant foliage and flower plumes.

Pruning Technique

Using sharp, sterilized pruners, trim back the previous year’s growth to a height of 4-6 inches above the ground. Carefully remove any damaged, discolored, or weak stems to encourage robust regrowth and prevent the accumulation of debris within the clump.


Propagating feather reed grass allows for the expansion of its presence within the landscape and provides an opportunity to share this captivating ornamental grass with others. The most common method of propagation for feather reed grass is through division.


In early spring, as new growth begins to emerge, carefully dig up the established clump of feather reed grass. Using a sharp, sterilized tool, divide the clump into smaller sections, ensuring that each division includes a generous portion of healthy roots and vigorous shoots. Replant the divisions at the appropriate spacing and provide adequate water to support their establishment.

Container Popularity

Feather reed grass excels in container gardening, offering an intriguing vertical dimension and ethereal elegance when grown in containers. Its adaptability to container cultivation makes it a sought-after choice for adding grace and structure to patios, balconies, and outdoor living spaces. Additionally, its resilience to a wide range of soil types further enhances its suitability for containerized growth.

Container Requirements

When growing feather reed grass in containers, it is essential to select a spacious, sturdy container with adequate drainage holes to facilitate proper aeration and moisture management. Utilize a high-quality, well-draining potting mix, and ensure consistent moisture levels while avoiding waterlogged conditions.

Common Diseases

While feather reed grass is relatively resistant to diseases, certain environmental conditions and cultural practices can predispose it to specific ailments. Understanding the common diseases affecting this ornamental grass and implementing appropriate preventive measures is imperative in maintaining its health and vitality.


Rust, caused by fungal pathogens, presents as orange to reddish-brown pustules on the foliage of feather reed grass. To mitigate the risk of rust infestation, ensure proper air circulation, and avoid overhead watering, especially during periods of high humidity.

Leaf Spots

Fungal leaf spots can manifest as dark, water-soaked lesions on the foliage of feather reed grass. To minimize the incidence of leaf spots, promote good air circulation, maintain proper spacing between plants, and avoid wetting the foliage during irrigation.

Disease Diagnosis

Accurately diagnosing diseases affecting feather reed grass is essential in implementing targeted management strategies to mitigate their impact. Conducting regular observations and being attentive to any changes in the plant’s appearance are pivotal in identifying potential disease issues in a timely manner.


Disease symptoms in feather reed grass may include the presence of discolored lesions on the foliage, abnormal growth patterns, wilting, or malformation of flower plumes. Additionally, any signs of unusual discoloration or texture should prompt a closer examination to ascertain the underlying cause.

Laboratory Analysis

In instances where the symptoms are ambiguous or the causal agent is uncertain, submitting a sample of the affected plant material to a diagnostic laboratory can provide valuable insights into the specific disease affecting the feather reed grass. This can aid in devising an effective disease management strategy tailored to the identified pathogen.

Common Pests

Although feather reed grass is relatively resistant to pest infestations, certain opportunistic pests can pose potential threats to its health and vigor. Familiarizing oneself with the common pests affecting this ornamental grass facilitates early detection and intervention, thereby safeguarding its well-being.


Aphids are small, sap-feeding insects that can congregate on the foliage and stems of feather reed grass, causing distortion and stunting of plant growth. Timely intervention using insecticidal soaps or horticultural oils can effectively manage aphid populations and minimize their impact on the grass.

Spider Mites

Spider mites are minuscule arachnids that feed on the sap of plants, leading to stippled, discolored foliage and the formation of fine webbing. Regularly inspecting the undersides of the leaves and employing targeted miticides can help mitigate spider mite infestations and preserve the health of feather reed grass.

Botanist’s Tips

Insights from botanists and horticultural experts can provide valuable guidance in optimizing the growth and vitality of feather reed grass. Employing the following tips and best practices can enhance the overall success of incorporating this stunning ornamental grass into various outdoor settings.

Soil Testing

Conducting a comprehensive soil test before planting feather reed grass enables the precise assessment of the soil’s pH, nutrient levels, and overall composition. This invaluable information aids in making informed amendments and adjustments to create an optimal growing environment for the grass.

Companion Planting

Pairing feather reed grass with compatible companion plants not only enhances the visual appeal of the landscape but also promotes ecological balance and biodiversity. Selecting flowering perennials, shrubs, or other ornamental grasses that complement the form and color of the grass can result in a harmonious and visually captivating planting scheme.


Applying a layer of organic mulch around the base of feather reed grass helps conserve soil moisture, suppress weed growth, and maintain a moderated soil temperature. Opt for natural mulch materials such as shredded bark, wood chips, or compost, and maintain a layer of 2-3 inches to reap the full benefits of mulching.

Fun Facts

Discovering intriguing and captivating aspects of feather reed grass adds to the allure and fascination surrounding this ornamental grass. Uncover these engaging fun facts to deepen your appreciation for the unique characteristics and contributions of feather reed grass to the natural world.

  • Winter Interest: The upright, tan-colored flower plumes of feather reed grass retain their structure and visual appeal throughout the winter, creating a striking contrast against the backdrop of snow and dormant landscapes.

  • Attracts Wildlife: The feathery plumes of feather reed grass provide nesting materials for birds and shelter for beneficial insects, contributing to the biodiversity and ecological value of the garden.

  • Drought Tolerant: Despite its graceful appearance, feather reed grass exhibits impressive tolerance to drought conditions, making it an ideal choice for water-wise landscapes and regions with periodic water restrictions.

  • Architectural Accent: The strong, vertical growth habit of feather reed grass endows it with architectural significance, serving as a captivating focal point and adding sculptural interest to garden compositions.

Links to External Resources

For further exploration of feather reed grass care, maintenance, and landscaping applications, refer to the following resources:

  1. Feather Reed Grass – University of Florida IFAS Extension
  2. Growing Ornamental Grasses – PennState Extension
  3. Ornamental Grasses for the Home Landscape – University of Missouri Extension
  4. Karl Foerster Feather Reed Grass – Royal Horticultural Society

In summary, feather reed grass, exemplified by the captivating Calamagrostis x acutiflora ‘Karl Foerster’ cultivar, stands out as a quintessential ornamental grass valued for its aesthetic allure, functional contributions, and ease of cultivation. With its graceful form, low maintenance requirements, and versatile applications, this perennial grass continues to charm and inspire both novice and seasoned gardeners alike, offering an enduring source of beauty and natural artistry in the landscape.

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Peter Taylors

Expert botanist who loves plants. His expertise spans taxonomy, plant ecology, and ethnobotany. An advocate for plant conservation, he mentors and educates future botanists, leaving a lasting impact on the field.