Phormium tenax 'Black Adder' · Asphodelaceae

New Zealand Flax

✅ Pet-friendlyPerennial, maintaining foliage year-round.60 to 120 cm

LightFull sun

WaterModerate

DifficultyEasy

ColdWithstands light frosts down to minus 5 degrees Celsius.

Full sunModerateEasyWithstands light frosts down to minus 5 degrees Celsius.

Description & origin

Phormium tenax 'Black Adder' is a perennial plant with sword-shaped, dark burgundy leaves. Ideal for modern and contemporary gardens, it offers a striking contrast with other plants. Hardy and easy to maintain, it adapts well to different soil conditions.

Size

Can reach up to 120 cm in height and 90 cm in width.

Foliage

Evergreen foliage that maintains color year-round.

Flowering

This species does not produce flowers in domestic cultivation.

Detailed care

Light

Prefers full sun for optimal growth.

Soil

Tolerates a variety of soils but prefers well-drained soils.

Watering

Moderate watering, allowing the soil to dry slightly between waterings.

Temperature

Hardy to light frosts, ideal for temperate climates.

Fertilising

Fertilize in spring with a balanced fertilizer to promote growth.

Repotting

Transplant in spring or early autumn.

Pruning

Remove dry or damaged leaves to keep the plant healthy.

Propagation

Propagates by division in spring.

Common problems

Root rot

Occurs in poorly drained soils. Ensure good drainage to prevent.

Leaf burn

Can occur in excessive sun exposure without adequate watering.

Snail attack

Snails can damage the leaves. Use natural control methods.

Uses & curiosities

In the garden

Borders
Contemporary gardens
Low maintenance gardens

Other uses

Ideal for creating visual contrasts in landscaping.

Did you know…

This plant is native to New Zealand and is often used in landscaping due to its distinctive foliage.