Species · genus Adiantum · Pteridaceae

Delta Maidenhair Fern

Adiantum raddianum C.Presl

Also known as: Delta Maidenhair · Fine Maidenhair Fern

Growth habit

perennial or lithophyte

Native range

Argentina Northeast, Argentina Northwest, Bolivia, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Colombia, Costa Rica, Ecuador, Guatemala, Haiti, Honduras, Mexico Central, Mexico Gulf, Mexico Southeast, Mexico Southwest, Nicaragua, Paraguay, Peru, Trinidad-Tobago, Uruguay, Venezuela, Windward Is.

Reference · A. raddianum

Cultivars of A. raddianum

The named forms growers keep — each with its own page, each honest about how much we know.

No named cultivars catalogued under A. raddianum yet. When growers document a stable, named form, it earns its own page here.

Guide

The species-level account. Cultivar pages build on this and say where they differ.

The maidenhair fern (Adiantum raddianum) is a delicate Pteridaceae fern from humid forests and shaded, damp rock faces across tropical and subtropical the Americas. As a forest-floor and lithophytic plant it wants bright indirect light, never direct sun, and consistently moist but never waterlogged mix in fast-draining medium. Water when the surface of the mix is just beginning to dry; this fern resents drying out fully and its fine fronds crisp quickly in dry air, so favor steady moisture and high humidity.

Care recipe

The species record — the baseline every cultivar inherits unless it says otherwise.

Care notes are early — not yet verified

Light: ai:claude-opus-4-8
Water: ai:claude-opus-4-8 (range 2-5d)
Humidity: ai:claude-opus-4-8
Soil: ai:claude-fable-5
Care: ai:claude-fable-5

Light

Bright, indirect

Water

≈ every 5 days

Humidity

High

Temperature

16–24 °C

Soil mix

Light, humus-rich, consistently moist mix

Propagation

Division of the rhizome, or spores

Fertilizing

Dilute balanced feed every few weeks in growth

Growth rate

Moderate

Flowering

Ferns don't flower — reproduce by spores

ToxicityAuthoritative · species

Not yet documented

This is where toxicity lives — every cultivar of this species inherits it and none can override it.

Reference images

Every image credited. Licenses link to their deeds.

No reference gallery yet

A few clear photos — habit, a mature leaf, a flower if it blooms — would give this page its eyes.

Add images

Sources: ai:claude-opus-4-8 · ai:claude-opus-4-8 (range 2-5d) · ai:claude-fable-5

Kept true by its growers

Every fact here carries its source. Grow Delta Maidenhair Fern yourself? What you’ve observed — how it drinks, how it holds its color, a name that’s off — is exactly what keeps this page honest. Contributions are reviewed before anything changes.