Blechnum cycadifolium - S

About the Blechnum cycadifolium - S

Blechnum cycadifolium, commonly called the cycad-leaved tree fern, is an evergreen fern from the Juan Fernández Islands. Its firm, glossy, leathery fronds form an ascending crown and closely resemble cycad leaves. S is the commercial size of the product offered; this designation does not indicate age, trunk formation or developmental stage. The species is well suited to container culture, an airy cool greenhouse or a sheltered outdoor position in a mild climate.

Characteristics

Origin: This species is endemic to Chile's Juan Fernández Islands. It grows from sea level into the mountains, including damp gullies and open rocky slopes exposed to maritime winds.

Family: Aspleniaceae in a broad current classification; horticultural literature still frequently places the species in Blechnaceae.

Position: A bright position in partial shade to sun, preferably cool, airy and protected from drying heat. Container culture is the safest option in colder climates; year-round outdoor planting is suitable only in a very mild, freely draining position.

Height: Mature specimens can form a trunk up to about 2 metres tall and develop fronds up to about 2 metres long. This describes the mature species and not the dimensions of the product supplied.

Flowering period: Not applicable. This fern does not flower but, once sufficiently developed, produces spores on separate fertile fronds.

Flower colour: Not applicable because the species does not produce flowers.

Hardiness: In favourable, freely draining conditions the species can tolerate brief temperatures around -5°C, but wet cold, poor winter light and trapped cold air increase the risk of damage. Protect the product offered from 0°C and preferably overwinter it in cool, frost-free conditions.

Soil type: An airy, humus-rich and freely draining substrate that retains even moisture. Fine bark or another coarse component helps prevent compaction and stagnant water.

Care

Light: Provide bright filtered light to sun. Acclimatise the plant gradually to stronger direct sunlight and avoid a sudden move into intense, hot midday sun under glass.

Water: Keep the substrate evenly moist without allowing the root ball to dry out completely. Always let excess water drain away; persistently wet roots and water held in the crown increase the risk of rot.

Fertiliser: Feed moderately during active growth with a suitable fern fertiliser or a mild balanced plant feed. Reduce or stop feeding when growth slows during the cool period.

Pruning: Remove only fully dried or damaged fronds. Do not damage the central growing point, and leave healthy fertile fronds in place.

Repotting: Repot when the roots have largely filled the available pot space. Choose a container only slightly larger, with generous drainage holes, and disturb the roots as little as possible.

Humidity: High humidity supports attractive foliage, but always combine it with good air movement. Stagnant humid air around the crown can encourage disease.

Special features: This evergreen species develops stiff, leathery fronds that strongly resemble cycad leaves. Sterile and spore-bearing fronds differ clearly in form, adding to the plant's architectural character.