Narrowleaf water-plantain (Alisma gramineum)

Narrowleaf water-plantain

Also known as: Grass water plantain, Alisma graminoide, Geyer waterplantain

Narrowleaf water-plantain grows as an annual herb in wetlands across temperate and subarctic climates. The tiny seeds from narrowleaf water-plantain can remain viable for several years before germinating. Though widespread around the world, this species' populations are often isolated and dwindling enough to be considered endangered.

Scientific classification

Species

Narrowleaf water-plantain (Alisma gramineum)

Water plantains and allies

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Perennial

Lifespan

Herb

Plant Type

Summer, Fall

Bloom Time

2.5 cm to 51 cm

Plant Height

10 cm

Spread

White, Pink, Purple

Flower Color

Deciduous

Leaf type

5 - 32 ℃

Ideal Temperature

Attributes of Narrowleaf water-plantain

Growth Rate

In spring and summer, the growth of narrowleaf water-plantain exhibits a moderate rate, resulting in a measured increase in its aquatic foliage and an upward leafy stalk expansion. This speed is well-suited to narrowleaf water-plantain's life cycle, allowing for a well-timed flowering stage amidst these seasons. The moderate growth also promotes resilience, helping the plant to flourish well in its native, wetland environments.

Distribution of Narrowleaf water-plantain

Distribution Map

Narrowleaf water-plantain is indigenous to a broad range spanning parts of Eurasia and Northern Africa, including temperate to tropical regions and the Eurasian Steppe. Its range notably covers areas from Western Europe through to Central and East Asia, encircling the Mediterranean and Black Sea regions. Narrowleaf water-plantain has also been introduced to the Iberian Peninsula, expanding its presence beyond its natural habitat.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Shallow fresh or brackish water or muddy shores

Care Guide for Narrowleaf water-plantain

Every week

Water

Full sun

Sunlight

5 - 32 ℃

Ideal Temperature

Water: Originating from wetlands, narrowleaf water-plantain thrives in high humidity and adapts well to consistently moist, saturated conditions. Watering once a week maintains its preferred moisture levels. As an aquatic perennial, narrowleaf water-plantain flourishes outdoors, forming colonies that aid in natural water filtration along ponds and streams.

Fertilize: Fertilize narrowleaf water-plantain bi-weekly with balanced nutrition during the growing season. Use a diluted formulation to ensure safety and efficiency. Reduce applications in winter months and follow product instructions to prevent nutrient burn. Incorporate fertilizer into water for aquatic setups and adjust based on soil tests.

Pruning: Narrowleaf water-plantain, known for its grass-like leaves and aquatic habitat, requires pruning from early to late spring for optimal health. Trim dead foliage to promote growth and prevent decay, enhancing water circulation and reducing disease risk, ensuring a vibrant aquatic garden feature.

Propagation: Narrowleaf water-plantain flourishes in aquatic settings, propagating mainly by sowing. Gardeners should use a moist substrate resembling its wetland habitat, ensuring seeds remain damp but not submerged. Fresh seeds yield better results, and germination may require more time than typical garden varieties.

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