Diplazium costale
Diplazium costale
Coastal fern
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Taxonomy
Family Athyriaceae · Genus Diplazium
Common Names
Coastal fern
Context
nativeRegion
Eastern Himalayas, Southeast Asia, tropical mountain forests.
usdaZones
Zones 10-12 (grown as indoor plant elsewhere).
companionPlants
Bletilla (ground orchid), Adiantum (maidenhair fern), Begonia species
culturalUses
Occasionally used in traditional medicine and as an ornamental in shade gardens and botanical collections.
Care
Care Requirements
LightPrefers filtered shade or partial shade; avoid direct sunlight.
WateringKeep soil consistently moist but not waterlogged; avoid letting it dry out.
SoilRich, humusy, well-draining soil with good organic content.
FertilizerApply a diluted balanced liquid fertilizer during active growth, once a month.
HumidityHigh humidity preferred; mist occasionally or keep in a naturally humid area.
TemperatureThrives in temperatures between 15-25°C (59-77°F); sensitive to frost.
Growth & Life Cycle
HabitTerrestrial, tufted fern with arching fronds.
Mature SizeReaches 60-120 cm (2-4 ft) in height and spread.
Growth RateModerate growth rate under optimal conditions.
BloomingDoes not flower; reproduces through spores.
DormancyGenerally keeps fronds year-round in tropical climates; may slow down in cool seasons.
Propagation
MethodsSpore sowing, Division of rhizomes
DifficultyModerate; division is easier for home gardeners.
Best SeasonEarly spring or during active growth period.
Maintenance & Notes
PruningRemove old, damaged, or yellow fronds to maintain appearance.
RepottingRepot every 2-3 years or when crowded.
Pests & DiseasesGenerally pest-free but can be affected by scale or fungal issues in overly damp conditions.
ToxicityNot known to be toxic to humans or pets.
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