Bolbitis Difformis

Quick facts

Identity

Also known as

Bolbitis Mini; Creeping Fern; El Nino Fern; Asian Water Fern; Lacy Bolbitis

Synonyms

Bolbitis heteroclita 'difformis'

Environment

Freshwater

Native to

Southeast Asia, Melanesia, northeastern South Asia, southern East Asia, Micronesia

Habitat

Shaded rocks and banks beside streams and waterfalls, mostly above the waterline in the splash zone with only occasional flooding

Sourcing

Aquacultured

Conservation

Not Evaluated

Care

Care level

Moderate

Growth form

Rhizome

Max height

4 – 10 in (10 – 25 cm)

Spread

7 in (18 cm)

Growth rate

Slow

Placement

Epiphyte, Midground

Water

Temperature

72 – 77 °F (22 – 25 °C)

pH

6.0 – 7.0

GH

1 – 10 dGH

dKH

0 – 10 dKH

Flow

Low-Moderate

Light

Low

CO₂

Beneficial

Planting

Substrate

Not needed

Feeds from

Water column

Fertilizer needs

Low

Colors

Green

Feeding & breeding

Propagation

Rhizome division, Plantlets

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Care guide

Overview

Narrow, finely divided fronds give this rhizome fern a lacier look than the standard broadleaf form, though care needs match it closely. Attach the rhizome to driftwood or rock in an area of gentle to moderate flow and low light, keeping it out of substrate to prevent rot. Growth is slow, so leaf loss takes time to recover.

Care

This creeping-rhizome fern grows very slowly whether kept submersed or emersed, and slow growth is normal rather than a sign of poor health. It does best in a paludarium or with part of the plant above the waterline where humidity stays high, since it is naturally more of a streambank plant than a fully aquatic one. Kept fully underwater it needs soft, slightly acidic water, gentle flow, subdued light, and stable parameters to avoid stalling or melting.

Planting & trimming

Attach the rhizome to driftwood or rock with thread, fishing line, or glue rather than planting it in substrate, since burying it causes rot. Position it where flow is gentle to moderate and light is low to moderate, and be patient, as it can take months to visibly anchor and establish. Old, established fronds can be left in place, since they often produce the plantlets used for propagation.

Fertilizing

Fertilizer demand is low. Occasional liquid fertilization with trace iron supports steady leaf production, and root tabs are unnecessary since the rhizome should never be buried in substrate. Yellowing or stunted new leaves usually point to insufficient iron or unstable water rather than a need for heavier dosing.

Propagation

The easiest method is dividing a mature rhizome into sections that each retain some roots and fronds, then reattaching the pieces to hardscape. Older fronds also form small plantlets at their tips that root down and grow into independent plants when they touch a surface or are gently detached and secured to wood or rock.

Problems

Fully submerged specimens are prone to stalling out or melting in hard, alkaline, or unstable water, so consistency matters more than any single parameter. Algae can build up on the broad, slow-growing leaves if flow and light are not well matched, so regular water changes and gentle current help keep surfaces clean. Because new growth is so slow, any leaf loss takes a long time to replace, making prevention more important than correction.

Sources

1. Bolbitis heteroclita care: light, CO2 and placement · TankBud
2. Bolbitis Heteroclita Care Guide – Planting, Growing, and Propagation - Shrimp and Snail Breeder
3. Asian Water Fern (Bolbitis heteroclita) | Aquatic Plants – Superior Shrimp & Aquatics
4. Bolbitis heteroclita

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