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Callitriche palustris

Callitriche palustris · Plantaginaceae

The gardener's calendar

The right move for September

Ideal time to plant callitriche palustris: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Family
Plantaginaceae
Form
Submerged aquatic
Foliage
Deciduous to semi-evergreen depending on climate
Adult size
Up to 30 cm in length
Hardiness
Hardy, tolerates frost and harsh winters
Origin
Europe, Northern Asia and North America
Growth
Rapid under favorable conditions

Care

Immersion and water circulation

Callitriche palustris is an aquatic plant that must remain constantly submerged or at least in very moist soil. Make sure water doesn't stagnate completely: slight circulation improves oxygenation and plant vigor. In an aquarium or closed tank, partially renew the water regularly to prevent the buildup of organic matter.

Light and positioning

This plant develops best under medium to strong light, typically 8 to 10 hours of light per day. It tolerates semi-shaded areas but remains more compact and vigorous in good light. Avoid direct exposure to intense rays that could encourage competing algae.

Substrate and anchorage

Callitriche palustris prefers nutrient-rich soil, slightly muddy or silty, typical of natural marshes. A substrate composed of quality potting soil, sand and silt works well. Rooting contributes to stability, but the plant also develops in free suspension in the water.

Nutrition and mineral supplements

In a natural environment or nutrient-rich water body, no supplementation is necessary. In an aquarium or isolated tank, occasionally add a diluted balanced liquid fertilizer, low in excess nitrogen to limit algae proliferation. A slight supply of macronutrients is enough to maintain good growth.

Pruning and growth control

Pinch the tips regularly to encourage branching and maintain a compact shape. Remove dead or diseased portions to promote water circulation and light penetration. This plant grows rapidly under optimal conditions: light pruning every 2 to 4 weeks maintains balance in small spaces.

Prevention and aquatic pests

Callitriche palustris is generally disease-resistant if water and light conditions remain good. An excess of nutrients can favor competing filamentous algae. Inspect regularly for aquatic snails or insect pests, and maintain well-oxygenated, clean water.

Did you know?

Callitriche palustris is a remarkably adaptable aquatic plant: it can grow completely submerged, amphibious at the water's edge or even partially out of water if the soil remains very moist. This ecological plasticity makes it an effective natural biofilter in freshwater treatment systems and a subject of botanical research on adaptation to habitat changes.

Where to buy it

Best planted in spring or autumn, away from frost and heatwaves. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September, October.

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Tips generated and checked by Viridia — adapt them to your local climate.