Glasswort
Salicornia europaea · Amaranthaceae
The gardener's calendar
Ideal time to plant glasswort: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, fleshy and succulent
- Flowering
- August to September, tiny greenish flowers
- Adult size
- 20 to 40 cm in height
- Growth
- Fast, annual
- Hardiness
- Low hardiness, frost-sensitive
- Origin
- Salty coastlines of Western and Mediterranean Europe
- Soil type
- Salty, sandy, coastal soils
Care
Light exposure
Glasswort appreciates sunny and well-ventilated exposure. It tolerates direct sunlight and coastal spray perfectly. An open location without shade promotes vigorous growth.
Soil and salinity
It thrives in salty and well-draining soils, typical of coastal and halophytic areas. A sandy substrate enriched with mineral salts suits it perfectly. Avoid overly compacted or poorly drained soils that could rot its roots.
Watering
Water moderately during the growing period, allowing the soil to dry slightly between waterings. In winter or at the end of its cycle, reduce watering. Stagnant excess moisture is harmful; drainage must be excellent.
Fertilizer
Apply balanced fertilizer once or twice a month during the growing period. Glasswort tolerates poor environments well and doesn't require intensive fertilization. Minimal feeding is generally sufficient.
Pruning and maintenance
No formal pruning is necessary. Simply remove dried or damaged parts to maintain its general appearance. This annual plant renews itself naturally each season.
Diseases and pests
Very rarely affected by diseases in its natural environment. Watch out for rot if stagnant moisture persists. When grown outside coastal conditions, check for common pests such as aphids or spider mites.
Did you know?
Glasswort (Salicornia europaea) was traditionally harvested along European coasts to produce soda ash (cinders containing sodium carbonate), used in glassmaking and soap production before the industrial era. It remains edible and slightly salty, appreciated in coastal cuisines as a flavorful vegetable rich in minerals.
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.
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Tips generated and checked by Viridia — adapt them to your local climate.