Karl Foerster Feather Reed Grass (Calamagrostis x acutiflora 'Karl Foerster') is a popular ornamental grass prized for its elegant, upright growth habit and feathery plumes. It forms dense clumps of narrow, dark green foliage that can reach heights of 3 to 5 feet and spread about 1 to 2 feet wide. In late spring to early summer, it produces tall, erect flower spikes that rise above the foliage, reaching up to 6 feet in height. The flower spikes start out green and then turn to a golden tan color as they mature, providing visual interest well into the winter months.
- Size: Height: 3 to 5 feet. Spread: 1 to 2 feet.
- Sunlight: Karl Foerster Feather Reed Grass thrives in full sun to partial shade. It performs best when provided with at least 6 hours of direct sunlight daily.
- Soil: Plant in well-draining soil with average fertility. It tolerates a wide range of soil types, including clay and sandy soils, but dislikes waterlogged conditions.
- Watering: Once established, it has moderate drought tolerance but benefits from regular watering, especially during hot, dry periods. Ensure the soil remains evenly moist but not waterlogged.
- Fertilization: Apply a balanced, slow-release fertilizer in spring to promote healthy growth and flowering.
- Pruning: Cut back the previous year's growth to ground level in late winter or early spring before new growth emerges. This helps rejuvenate the plant and encourages vigorous growth.
- Dividing: Every few years, consider dividing mature clumps to maintain plant vigor and prevent overcrowding.
- Pest and Disease Control: Karl Foerster Feather Reed Grass is relatively pest and disease resistant, making it a low-maintenance plant in the landscape. However, watch out for occasional issues such as rust or leaf spot, which can be managed through proper sanitation and, if necessary, fungicidal treatments.