Heterogonium Pinnatum

Quick facts

Identity

Also known as

Stenosemia Fern

Synonyms

Stenosemia pinnata

Environment

Terrestrial

Native to

Philippines, Thailand, Laos, Cambodia, Southeast Asia

Habitat

Rainforest understory near streams at low altitudes, growing on humid soil banks in shaded, moist conditions

Sourcing

Aquacultured

Conservation

Not Evaluated

Care

Care level

Moderate

Growth form

Rhizome

Max height

6 – 15 in (15 – 38 cm)

Spread

12 in (30 cm)

Growth rate

Slow

Placement

Foreground, Midground

Water

Temperature

68 – 82 °F (20 – 28 °C)

Humidity

70 – 95%

Planting

Substrate

Nutrient-rich preferred

Feeds from

Roots

Fertilizer needs

Low

Colors

Green, Brown, Purple

Feeding & breeding

Propagation

Rhizome division

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Care guide

Overview

A dark purple-brown stripe runs along the sterile and fertile fronds of mature specimens, while younger plants stay more compact with wider, greener leaves. Reaching 10 to 15 inches, this rhizomatous fern spreads slowly and belongs in a shaded terrarium or paludarium land section rather than an open aquarium. Keep humidity high, soil moist but draining, and never submerge it.

Care

This fern needs consistently high humidity and gentle, filtered or indirect light, making it best suited to closed terrariums and paludarium land sections rather than open tanks. Direct sun or strong grow lights tend to scorch the fronds, causing browning and dieback, while soggy, waterlogged soil leads to root rot. Provide airflow to prevent fungal issues, but keep the surrounding air moist through misting or a humid enclosure.

Planting & trimming

Remove any packing material such as cotton or sphagnum from around the roots before planting into a well-draining, organic-rich terrarium soil mix. Keep the rhizome and crown at or just above the soil surface rather than burying it deeply, and situate the plant in a partially shaded, humid microclimate away from direct light or splashing water. Established clumps can be trimmed of old or damaged fronds at the base to keep growth tidy.

Fertilizing

Light dosing of a diluted liquid fertilizer or an occasional root tab worked gently into the soil supports steady growth, since this fern draws nutrients through its roots rather than from water or air. Iron supplementation can help maintain deeper green coloration in mature fronds. Pale or yellowing new growth usually signals a nutrient deficiency rather than overwatering, which instead shows up as generalized yellowing of older leaves.

Propagation

New plants are produced by dividing the creeping rhizome into sections, each with at least one growth point and a few roots attached, then replanting the divisions in humid soil. Growth is slow to moderate, so divisions should be given time to establish before further splitting. Spore propagation is possible in principle for ferns but is rarely practiced in the hobby for this species.

Problems

Yellowing leaves typically point to overly wet soil or poor drainage around the roots. Browning or crisping fronds usually indicate too much light or insufficient humidity in the enclosure. Because it cannot tolerate submersion, any prolonged contact with standing water in a paludarium will lead to rapid melt and eventual death of the plant.

Sources

1. Heterogonium Pinnatum - Buce Plant
2. Ferns of Thailand, Laos and Cambodia > Heterogonium pinnatum

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