Spiny naiad (Najas marina)

Spiny naiad

Also known as: Holly-leaf naiad

Spiny naiad (Najas marina) is an annual aquatic plant. It is globally widespread in many freshwater and brackish aquatic ecosystems with slow-moving or stagnant water, and even in alkaline waters. In favorable conditions, it can form dense mats that can choke out other aquatic plant species, so it is considered an aquatic weed in some places. Spiny naiad is gladly eaten by waterfowl, which helps spread its tough, long-lived seeds.

Scientific classification

Species

Spiny naiad (Najas marina)

Water plantains and allies

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Annual, Perennial

Lifespan

Herb

Plant Type

All year round

Bloom Time

10 cm to 46 cm

Plant Height

2 mm

Flower Size

Semi-evergreen

Leaf type

Images of Spiny naiad

Care Guide for Spiny naiad

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Spiny naiad thrives in abundant water conditions, favoring consistent moisture and tolerating submerged environments. Weekly watering is essential to meet its hydration needs. Typically grown outdoors, spiny naiad is resilient to fluctuating water levels, adapting well to both inundation and slight drought.

Fertilize: For spiny naiad, use a balanced or high-nitrogen fertilizer to support growth, fertilizing bimonthly during active phases and reducing during dormancy. Adjust based on seasons: increase in spring/summer and decrease in fall/winter. Apply during water changes and avoid direct contact with leaves to prevent burn.

Pruning: Spiny naiad is a submerged aquatic plant with spiny, toothed leaves. Prune in early to late spring to control growth and reduce overcrowding by removing dead stems. Regular pruning ensures adequate light, nutrients, and promotes growth while minimizing disease, considering the plant's rapid growth and water conditions.

Propagation: Spiny naiad propagates effectively from viable seeds sown in suitable substrate. Maintain moisture for germination, avoid overwatering, and provide moderate temperatures with diffused light. Once established, young plants can be transferred to their final aquatic locations for optimal growth.

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Learn More About Spiny naiad

Sunlight Requirements

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