Nephrolepsis cordifolia (Kupukupu)
- TropPlant Accession Number (TPAN): 0127
- Botanical Name: Nephrolepsis cordifolia
- Common Name: Kupukupu, Narrow Sword Fern, Fishbone Fern
- Cultivar: N/A
- Family: Nephrolepidaceae
- Native To: Considered Pantropical; Indigenous to the Hawaiian Islands, Asia, and Northern Australia.
- Plant Type: Fern, Tuberous
- Texture: Dense, Coarse
- Form: Upright-Narrow
- Height (on average, in landscape use): 1'-2'
- Spread: Stolons grow from the tuber giving rise to new plants.
- Growth Rate: Medium
- Landscape Values: Background, Border, Edging, Filler, Foundation, Framing, Groundcover, Indoor, Lanai, Mass, Patio, Erosion Control
- Outstanding Quality: Form/Silhouette, Foliage Characters
- Foliage Color: Young/immature: Light Green Mature: Bright Medium Green to Dark Green
- Leaflet (Pinnae) Tip: Rounded
- Foliage Base: Truncate
- Petiole: Light brown to muted brown; narrow; 2"-8" long
- Margins: Undulate
- Frond Arrangement: Rosette
- Leaflet (Pinnae) Shape: Deltoid
- Leaf Type: Once Pinnate, Frond
- Leaf Texture: Glabrous (smooth) adaxial and abaxial surfaces on trophophylls and sporotrophophylls, but sporotrophophylls containing flabellate (fan-shaped) indusia.
- Leaf Special Notes: Fronds are typically erect.
- Bark and Trunk: Upright rhizomes; No bark or trunk, but notable golden, velvety, scaly tuberous stems which grow with maturity. Stolons emerge from the tuber giving rise to new tubers.
- Light Preference: Semi-Sun to Full Sun
- Light Tolerances: Shade
- Soil Preferences: Not Particular, but best in Slightly Acidic to Neutral pH, Moist, and Well-Drained soils.
- Tolerances: Compacted Soil, Moderate Winds, Humidity, (moderate) Drought
- Water Requirements: Prefers well-draining soil; water frequently as it enjoys moist soils, but do not let the fern sit in water or heavily saturated soil.
- Notes on Maintenance: Tolerates a wide range of temperatures and soil types, but will not survive in freezing conditions, salty soils, or standing water. Plants send out stolons which give rise to new plantlets.
- Propagation: Spores, Division
- Minimum USDA Hardiness Zone: 8a
- Weed Risk Assessment Score (WRA): Indigenous plant; not considered a weed.
- Common Name Meaning: The Hawaiian word kupu means to "spring forth", "sprout", and "grow".
Additional Reference: https://www.ctahr.hawaii.edu/oc/freepubs/pdf/OF-43.pdf