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Ferns

Adiantum raddianum 'Fritz Lüthi'

Delta maidenhair fern 'Fritz Lüthi'

A tender, evergreen fern about 60cm in height, bearing triangular, black-stalked, light green fronds with triangular to rounded, deeply lobed, overlapping segments that are held horizontally or arch downwards

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Plant nurseries
2 suppliers

Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Loam

Chalk

Sand

Clay

Moisture

Moist but well–drained

pH

Neutral, Alkaline, Acid

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

West–facing or East–facing or North–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)

H1C

Botanical details

Family: Pteridaceae
Native to GB / Ireland: No
Foliage: Semi evergreen or Evergreen
Habit: Clump forming
Genus: Adiantum can be deciduous or evergreen ferns with shiny black stalks bearing simple or more usually pinnately divided fronds, the segments fan-shaped, oblong or rounded, carrying spores under reflexed marginal flaps
Name status: Accepted

How to grow

Cultivation

Grow as a house or conservatory plant indoors in a peat-free houseplant compost. Position the container in bright, indirect light with good ventilation. Water freely and apply a half strength, general liquid feed monthly from mid spring to late summer. Provide high humidity by placing the container on a tray of moist gravel or pebbles. Water sparingly in winter. See how to grow ferns as houseplants for further information

Propagation

Propagate by division of rhizomes in spring

Suggested planting locations and garden types

Houseplants
Conservatory and greenhouse

Pruning

Can trim back any faded growth in winter if required or wait for new growth to start emerging in spring.

Pests

Generally pest-free

Diseases

Generally disease-free

Get involved

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