Unknown · Public domain
About
Known as the Delta maidenhair fern, *Adiantum raddianum* is a popular indoor houseplant prized for its shiny, dark leafstalks, which give it a unique appearance.
Field notes
Morphology
The triangular fronds are semi-erect when young, then droop gracefully, reaching up to 12 inches (30 cm) long by 6 inches (15 cm) wide. The plant typically grows 17–19 inches (43–48 cm) tall and up to 22 inches (56 cm) wide.
Distribution & habitat
Native to South America; found in forest floors, rock crevices, river banks, coastal cliffs, and basalt banks along trails and streams.
Cultivation notes
Requires high humidity, well-drained soil, and bright indirect light. It prefers neutral or slightly alkaline soil and is suitable for USDA hardiness zones 10 and 11. It is hardy down to 5 °C (41 °F) and can be grown indoors in temperate regions, though it can be placed in a sheltered spot during summer months.
History & etymology
The genus name Adiantum comes from the Greek word "adiantos," meaning "unwetted," referencing the leaves.
Habitat
- Altitude
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- Altitude Class
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Cultivation
- Difficulty
- difficult
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