Sea arrowgrass
Triglochin maritima · Juncaginaceae
The gardener's calendar
Ideal time to plant sea arrowgrass: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Scientific name
- Triglochin maritima
- Family
- Juncaginaceae
- Type
- Perennial herbaceous plant
- Foliage
- Deciduous
- Flowering
- June to August
- Adult size
- 30 to 60 cm in height
- Hardiness
- Very hardy (down to -20 °C)
- Origin
- Coastal and humid temperate and boreal zones
Care
Exposure
Sea arrowgrass prefers a sunny to partially shaded exposure. It tolerates wind-swept areas typical of coastal environments where it naturally thrives.
Soil and substrate
This plant loves moist, slightly saline or alkaline soils. It adapts well to marshy terrain, wet meadows and coastal zones where moisture is constant. Good drainage is not essential, unlike many perennial plants.
Watering
Keep the soil regularly moist, especially during the growing period. In its natural habitat, this plant thrives in areas that are regularly waterlogged. Reduce watering slightly in winter, but avoid drying it out completely.
Fertilization
Sea arrowgrass is not demanding in terms of nutrients. Fertilizer is generally not necessary. If the soil is very poor, a light application of compost or organic fertilizer in spring is sufficient.
Pruning and maintenance
No regular pruning is required. Simply remove dried stems in late winter or spring to encourage vigorous regrowth. This plant regenerates naturally after winter dormancy.
Pests and diseases
Sea arrowgrass is very robust and rarely affected by diseases or pests. Its moist habitat and natural constitution protect it effectively. Watch for excessively wet conditions that could promote root rot in poorly drained soils.
Did you know?
Sea arrowgrass has been known since antiquity for its ability to thrive in coastal salt marshes, where it stabilizes sediments. In Scandinavia and arctic regions, this hardy plant is a key element of tundra coastal ecosystems, playing a major role in vegetation succession in cold wetland zones.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Triglochin palustrisTriglochin palustris
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- LavenderLavandula angustifolia
Tips generated and checked by Viridia — adapt them to your local climate.