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Avicennia marina

Avicennia marina · Acanthaceae

The gardener's calendar

The right move for September

In autumn, ease off feeding and take the chance to clean up around avicennia marina and prepare for winter.

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ID card

Common name
Grey mangrove
Foliage
Evergreen
Flowering
Spring to summer (small yellow flowers)
Adult size
3 to 8 m in height depending on conditions
Growth
Moderate to fast in warm climates
Hardiness
Tropical and subtropical, frost-tender
Origin
Tropical coastal zones of Asia and Oceania
Soil type
Tolerates saline and wet soils

Care

Watering

Avicennia marina thrives in coastal environments and tolerates saltwater exceptionally well. In containers or when grown outside its native range, water regularly during the growing season while keeping the substrate moist but well-draining. Reduce watering in winter. This species, naturally adapted to mangrove zones, even accepts waterlogged conditions.

Light exposure

Place this plant in full sun to encourage optimal growth and generous flowering. It handles intense light and coastal spray very well, making it an excellent choice for seaside gardens. Shaded exposure will slow its vigor.

Soil and drainage

Avicennia marina adapts remarkably to saline and hypersaline soils of mangrove zones. In cultivation, provide a well-draining mix enriched with organic matter, or slightly compacted and moist. Adding sand or pumice improves drainage while retaining moisture.

Pruning and training

Pruning isn't essential but can be done after flowering to maintain a compact form or rejuvenate older plants. Remove dead or poorly oriented branches. When used as a coastal hedge, prune lightly to structure the silhouette without excess.

Fertilizing

Apply a balanced fertilizer (NPK) once or twice monthly during the growing season (spring-summer). In very warm climates with low nutrient availability, micronutrient supplements (iron, magnesium) can prevent chlorosis. Reduce feeding in winter.

Diseases and pests

In its natural tropical range, Avicennia marina is robust and rarely troubled by serious problems. In protected cultivation, watch for scale insects and spider mites under water stress conditions. Waterlogging can encourage root rot, so good drainage is essential.

Did you know?

Avicennia marina is a pioneering mangrove species of tropical and subtropical coastal zones, capable of tolerating extreme salinity thanks to its aerial roots (pneumatophores) that filter salt and its leaves that excrete it. This species plays a crucial ecological role in stabilizing sediments and creating nurseries for juvenile fish and crustaceans in marine environments.

Where to buy it

Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.

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