Blunt spikerush (Eleocharis obtusa)

Blunt spikerush

Blunt spikerush (Eleocharis obtusa) is a grasslike spikesedge that grows on riverbanks and moist forest floors. Its native range extends across Canada and the United States, but it can now be found many other places. Though normally a harmless wild plant, it is considered a weed in rice paddies, where it can outcompete young rice sprouts.

Scientific classification

Species

Blunt spikerush (Eleocharis obtusa)

Grasses, sedges and allies

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5 cm to 50 cm

Plant Height

2 mm to 4 mm

Flower Size

Yellow, Green, Brown

Flower Color

Evergreen

Leaf type

20 - 35 ℃

Ideal Temperature

Spring

Growth Season

Moderate

Growth Rate

Images of Blunt spikerush

Attributes of Blunt spikerush

Growth Rate

During its spring active growing season, blunt spikerush undergoes moderate growth. This pace supports steady development, manifesting in gradual height increase and the formation of its characteristic spike-like flowers. However, this growth rate reflects a slower tempo compared to other seasons, enabling it to sustain its energy reserves.

Distribution of Blunt spikerush

Distribution Map

Blunt spikerush is a plant species with a natural distribution primarily in North America. It has since been introduced to parts of Europe where it has established itself in various wetland habitats. The species can be found prominently across the eastern and central regions of the North American continent, while its introduced range includes significant portions of western and southern Europe.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Riverbanks, moist forest floors, rice paddies

Hemisphere Trend Curve

Northern

Sorthern

Care Guide for Blunt spikerush

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Blunt spikerush thrives in wetland environments, preferring consistent moisture with moderate drought tolerance. Water weekly to simulate natural hydration. Best grown outdoors, it benefits from rainfall and humidity, making it ideal for rain gardens or areas with variable water availability.

Fertilize: For blunt spikerush, use organic mulch or compost to enrich soil and promote growth. Fertilize lightly at planting and twice yearly, using minimal layers to prevent root burn. Monitor seasonal variations and evenly distribute to ensure robust health and longevity of blunt spikerush.

Pruning: Blunt spikerush thrives in wetlands and benefits from early spring pruning to promote dense growth and reduce overcrowding. This practice improves health by enhancing air circulation and minimizing disease risk. Use clean tools for cutting back, and regular trimming boosts its ornamental appeal and manages spread.

Propagation: Blunt spikerush prefers moist to wetland environments; division is an effective propagation method. Separate and replant dense roots in water-saturated substrates for quick establishment. Consistent moisture is crucial to mimic natural habitat, promoting healthy growth and the characteristic appearance of blunt spikerush.

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