Adiantum raddianum
Adiantum raddianum
Delta maidenhair fern
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Taxonomy
Family Pteridaceae · Genus Adiantum
Common Names
Delta maidenhair fernMaidenhair fern
Context
nativeRegion
Tropical and subtropical Americas, including Central and South America.
usdaZones
Zones 10-11 outdoors; commonly grown as a houseplant elsewhere.
companionPlants
Calathea spp., Asplenium nidus, Fittonia spp., Peperomia spp.
culturalUses
Popular as an ornamental houseplant; valued for its delicate, attractive foliage.
Care
Care Requirements
LightPrefers bright, indirect light but tolerates some shade. Avoid direct sunlight as it can scorch the fronds.
WateringKeep the soil consistently moist but not waterlogged. Water with room temperature, dechlorinated water. Do not let soil dry out.
SoilRich, well-draining soil with high organic content, such as a peat-based mix with added perlite.
FertilizerFeed every 4-6 weeks during the growing season with a balanced, diluted liquid fertilizer.
HumidityRequires high humidity (50-80%). Mist regularly or use a humidity tray or humidifier.
TemperatureOptimal range is 18-24°C (65-75°F). Avoid cold drafts and temperatures below 13°C (55°F).
Growth & Life Cycle
HabitEvergreen, clump-forming fern with delicate, arching fronds.
Mature Size30-45 cm (12-18 inches) tall and wide.
Growth RateModerate growth rate under optimal humid conditions.
BloomingNon-flowering; reproduces via spores.
DormancyDoes not have a pronounced dormancy but growth slows in cooler months.
Propagation
MethodsSpores, Division of rhizomes
DifficultyModerate; division is easier than starting from spores.
Best SeasonSpring or early summer
Maintenance & Notes
PruningRemove old, yellowed, or damaged fronds to encourage new growth.
RepottingRepot every 2-3 years or when rootbound; use fresh, well-draining potting mix.
Pests & DiseasesSusceptible to scale, aphids, and spider mites; root rot if overwatered.
ToxicityNon-toxic to humans and pets.
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