Karl Foerster Feather Reed Grass Calamagrostis x acutiflora 'Karl Foester' Description Blooms sterile golden-tan flowers. Dark green foliage. Bloom Period: Late Spring throughout SummerGrowth Habit: Upright and clumpingGrass Type: Cool SeasonMature Height: 3.5' to 5' (107 cm to 152 cm)Mature Spread: 2' to 2.5' (61 cm to 76 cm)Growth Rate: Moderate More Details Sun Exposure: Full Sun to Partial ShadeCold Hardiness Zone: 4Drought TolerantDeer ResistantLong BloomingFlowers can be used as dried flowers