SafePlants

Delta Maidenhair Fern (Adiantum raddianum)

The Delta Maidenhair Fern, scientifically known as Adiantum raddianum, is a popular fern admired for its delicate and elegant foliage.

Considerations for Pets

• This plant has delicate, lacy fronds.

Considerations for Children

• This plant has delicate, lacy fronds.

Taxonomy and Nomenclature

• Scientific Name: Adiantum raddianum C. Presl
• Common Names: Delta Maidenhair Fern, Maidenhair Fern, Fine Maidenhair Fern, Rads Maidenhair Fern
• Synonyms: Adiantum cuneatum
• Family: Pteridaceae

Distribution and Habitat

• Native to North and South America, particularly central and South America.
• Naturally found on rocky cliffs.
• The species has been reported as invasive in Hawaii.

Morphological Characteristics and Growth Habits

• Evergreen foliage plant.
• Fast-growing.
• Features delicate, lacy fronds held on wiry, black stems, typically 6-12 inches in length.
• Some varieties, such as Adiantum raddianum 'Fragrantissimum', bear triangular, 3- or 4-pinnate, black-stalked, pale green fronds.
• Grows best in positions that do not receive direct summer sunlight during the heat of the day.
• Considered a perennial plant.

Ecological Role

• Reported as an invasive species in Hawaii. Its presence can have implications for the local ecosystem.

Cultivation

• Relatively easy to grow.
• Well-suited for growing in terrariums or conservatories.
• Makes an excellent container plant.
• Prefers a cool, shady spot indoors with a humid atmosphere.

Quirky Facts

• One source mentions a specific location on Oahu where the plant is found, with about 172 "petals" making up one leaf (note: "petals" may be a non-technical descriptor here).

Further Information

• RHS (Royal Horticultural Society) provides help and information on Adiantum raddianum.
• CABI (Centre for Agriculture and Bioscience International).
• USDA PLANTS Database.
• Royal Botanic Gardens, Kew.
• Dave's Garden: A community for sharing gardening tips and ideas.