

How to identify Eastern bottle-brush grass (Elymus hystrix)
Eastern bottle-brush grass, also known as Bottlebrush grass
Eastern bottle-brush grass is characterized by its bottlebrush-like seed heads, which stand out above its foliage. This perennial grass typically reaches heights of 2-4 feet (60-120 cm) with an equal spread. It exhibits blue-green blades that may turn yellow in fall, providing seasonal interest. In summer, it may enter dormancy, especially when exposed to intense heat, yet it thrives in shaded woodland conditions. Its blades are narrow, and it forms loosely tufted clumps and demonstrates a modest self-seeding behavior without being invasive.
Bottlebrush-like seed heads extend above the foliage, distinctive in appearance.
Blue-green blades that may turn yellow in fall provide seasonal interest.
Loose tufted clumps with narrow blades that self-seed modestly but are not invasive.
Delicate pale green to tan flowers bloom in loose, airy clusters from May to July.
Fruit is a bristly caryopsis on a spike, maturing to straw-like color, measuring 0.3-0.5 inches.
The flowers of eastern bottle-brush grass typically bloom from May to July. They form in loose, open clusters along slender, spike-like structures. Each flower is approximately 0.25 inches (6 mm) long, featuring elongated, bristle-like awns extending up to 1 inch (25 mm) beyond the flower. The delicate flowers exhibit a pale green to tan hue and lack a noticeable fragrance. These subtle and airy blooms contribute to the plant's graceful and understated appearance during their blooming period.
The fruit of eastern bottle-brush grass is a caryopsis, a type of dry, indehiscent fruit, which commonly retains a bristly, elongated appearance, reminiscent of a bottle brush. These grains are borne on a spike, and each individual fruit features a hard outer covering that houses the seed within. Typically, the fruit has a straw-like color maturing towards a tawny brown as the season progresses. As a characteristic of many grasses, the fruit measures approximately 0.3-0.5 inches (7-12 mm) in length, displaying a rough texture to the touch. These fruits are prominent from July to September, aligning with the information given.
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Scientific Classification of Eastern bottle-brush grass