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Bird’s-nest fern (Asplenium antiquum)

Asplenium antiquum is an evergreen fern with an epiphytic habit, forming a central rosette or nest-like growth and occurring on tree trunks, branches, rocks, and cliffs in the wild.

LightProvide bright indirect light to partial shade and avoid strong direct sunlight; it tolerates some shade, but prolonged low light can produce weak, elongated leaves.
WaterKeep evenly moist without allowing the growing medium to become waterlogged or remain saturated; from spring through autumn, water as it begins to dry, keep it drier in winter, and allow excess water to drain readily aft
HumidityIt generally prefers high humidity and needs good airflow.
TemperatureFew sources give a minimum temperature, with one reporting about 4.4 °C. It is tender and frost tender; keep above freezing. Hardiness guidance describes sheltered, well-ventilated temperate or subtropical conditions as
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Overview

Asplenium antiquum is an evergreen fern with an epiphytic habit, forming a central rosette or nest-like growth and occurring on tree trunks, branches, rocks, and cliffs in the wild.

Origin and habitat

Sources differ on its native range, describing it as native to East Asia, including southeastern China, Taiwan, Korea, and Japan, with its Japanese distribution mainly in warmer southern areas. It inhabits moist forests, where it occurs on tree trunks, branches, fallen wood, rocks, rock faces, and near waterfalls, often as an epiphyte; Chinese-language sources also record it in moist low- to mid-elevation mountain areas. It is reported to be native to temperate to subtropical environments in East Asia, occurring commonly on trees in warmer areas and more often on rocks or the ground in colder parts of mainland Japan.

Characteristics

Mature plants reach 60–90 cm in height; sources are few for spread, which is reported at about 50–100 cm. Growth is generally slow, and the plant has an erect rhizome. The glossy, bright green leaves are simple, narrow, elongated, and flat, ranging from lance-shaped to broadly linear, with pointed tips, entire to slightly wavy margins, and a prominent midrib that may become brown on mature leaves; they radiate from the center to form a nest-like rosette.

Light

Provide bright indirect light to partial shade and avoid strong direct sunlight; it tolerates some shade, but prolonged low light can produce weak, elongated leaves.

Watering

Keep evenly moist without allowing the growing medium to become waterlogged or remain saturated; from spring through autumn, water as it begins to dry, keep it drier in winter, and allow excess water to drain readily after watering.

Humidity and airflow

It generally prefers high humidity and needs good airflow.

Temperature and dormancy

Few sources give a minimum temperature, with one reporting about 4.4 °C. It is tender and frost tender; keep above freezing. Hardiness guidance describes sheltered, well-ventilated temperate or subtropical conditions as suitable for year-round outdoor cultivation in some areas, while another hardiness classification is also given.

Growing medium and mounting

Use a moist but well-drained and well-aerated growing medium, such as sphagnum moss or an organic-rich potting medium with added drainage material; RHS recommends acidic to neutral loamy conditions.

Feeding

Feed during the growing season; sources differ, with RHS recommending diluted general liquid fertilizer on a regular schedule in part of the growing season and NHK recommending slow-release synthetic fertilizer at longer intervals from spring through autumn.

Propagation

It is generally reported to be propagated by division or spore. Sources report that mature spores can be sown promptly after maturation and specify a sowing temperature, without a numerical temperature stated here.

Common problems

Scale insects may occur, while genus-level cultivation information from NHK also lists spider mites and slugs. Sources differ on diseases: RHS reports that disease is generally uncommon, while NHK genus-level cultivation information records anthracnose and soft rot from spring through autumn. An overly saturated growing medium may lead to rot, while prolonged low light may produce weak, elongated leaves. It is sensitive to frost and low temperatures, and sources recommend protection or moving it indoors when nights become sufficiently cold; outdoor sites should be sheltered.

Identification

Asplenium antiquum has a characteristic nest-like rosette; compared with Asplenium nidus, sources describe its leaves as more uniform in width, and another source describes a smaller plant with more spear-shaped leaves. Linear spore-bearing structures on the underside of the leaf extend outward from the midrib across much of the leaf width.

Photos

Asplenium antiquum
📷 Travisthurston · CC BY-SA 3.0 · source

Sources