Knotsheath sedge (Carex retrorsa)

Knotsheath sedge

Knotsheath sedge (Carex retrorsa) is a wild grass that can be difficult to differentiate from similar species because there are so many sedges growing wild in its native North America. However, it grows in clumps and has a smaller perigyna (a sac that surrounds the seed) than the similar Carex lupulina. This grass is not classed as invasive and isn't grown ornamentally.

Scientific classification

Species

Knotsheath sedge (Carex retrorsa)

Grasses, sedges and allies

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Perennial

Lifespan

Grass

Plant Type

Summer, Fall

Bloom Time

10 cm to 1.02 m

Plant Height

Yellow, Green, Brown

Flower Color

Evergreen

Leaf type

Images of Knotsheath sedge

Culture

Interesting Facts

In 1754, Lin Nai founded the true sedge genus. True sedge is also one of the main components of the flora in China. It is the dominant grass species in the lowest forest layer in many areas. In some forests, the lower vegetation is mostly true sedge.

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Care Guide for Knotsheath sedge

Every week

Water

Partial sun

Sunlight

10 - 35 ℃

Ideal Temperature

Water: Knotsheath sedge thrives in moist environments, preferring consistent moisture without waterlogging. A weekly watering schedule is recommended, aligning with its natural wetland habitat. As an outdoor plant, knotsheath sedge's watering needs and growth cycles vary with climate zones.

Fertilize: For knotsheath sedge, applying mulch or compost annually in early spring enhances growth by supporting nutrient uptake and root development. A thin layer should surround knotsheath sedge, avoiding base contact. With low fertilization needs, knotsheath sedge suits all gardeners, promoting organic growth while preventing aggressive spread.

Pruning: Knotsheath sedge is a robust perennial sedge with clumping growth. Prune in early spring to encourage healthy growth, air circulation, and manage spread. Remove dead foliage with clean, sharp tools to reduce disease risk and maintain a tidy appearance.

Propagation: Knotsheath sedge thrives in moisture-retentive soils and semi-aquatic environments. Propagation through division is effective; divide rhizomes in spring, ensuring each clump has roots and shoots. Replant in moist, loamy soil at the original depth, and water regularly for rapid establishment.

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Learn More About Knotsheath sedge

Sunlight Requirements

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