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Adiantum raddianum

Delta maidenhair fern

A tender evergreen fern about 60cm tall, the black-stalked, triangular fronds with rounded to triangular, variably lobed segments, the colouring a pale green initially, but darkening with age

Other common names

roseate maidenhair fern

Synonyms

Adiantum rubellum
Adiantum cuneatum

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Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Loam

Moisture

Moist but well–drained

pH

Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

East–facing or North–facing or West–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: Evergreen
Habit: Clump forming, Bushy
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: Correct
Plant range: Tropical America: W Indies

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 sowing spores as soon as ripe at a minimum of 21°C, or propagate by division of the rhizomes in early spring

Suggested planting locations and garden types

hanging basket
Houseplants
Sub-tropical
Conservatory and greenhouse

Pruning

Plant requires little pruning other than the removal of dead leaves

Pests

May be susceptible to scale insects

Diseases

Generally disease-free

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