Nephrolepis duffii

RHS Plant Profile

erect sword fern

Other common names

lemon button fern, button sword fern, Duff's sword fern

Synonyms

Nephrolepis exaltata 'Duffy'
Nephrolepis cordifolia 'Duffii'

Conservatory Greenhouse Ferns Herbaceous Perennial Houseplants

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A compact, clump-forming, evergreen fern with masses of dark green, dense, sword-shaped, tripinnate fronds which are ruffled around the edges. The fronds have a mild lemony fragrance during the growing season. A good air-purifying plant and ideal for terrariums and bottle gardens

Position

Partial shade

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 5–10 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Loam Sand

Moisture: Moist but well–drained
pH: Acid or Neutral

Position

Partial shade

Aspect: North–facing or West–facing or East–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H1B

Colour & Scent

Fragrance Foliage

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Lomariopsidaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
Genus: Nephrolepis are rhizomatous, sometimes stoloniferous, evergreen ferns with narrow, pinnately divided fronds, broader and more highly dissected in many cultivars
Name Status: Correct

How to Grow

Cultivation

Grow indoors or under glass in a peat-free multipurpose compost, or a mix of 1 part loam, 2 parts sharp sand and 3 parts leaf mould, in bright filtered light, with moderate to high humidity and good ventilation. During the growing season, water moderately with soft water and apply a half-strength balanced liquid fertiliser monthly. Water sparingly in winter. Fronds can rot if they become too wet. An ideal plant for terrariums and bottle gardens. See how to grow ferns as houseplants for further advice

Propagation

Sow spores are 21°C (70°F) as soon as ripe, but resulting plants are unlikely to come true. Separate rooted runners in late winter or early spring

Suggested planting locations and garden types

Houseplants
Patio and container plants
Conservatory and greenhouse

Pruning

Remove any dead fronds

Pests

May be susceptible to scale insects

Diseases

Generally disease-free