Phormium tenax Black Adder · Hemerocallidaceae

New Zealand Flax

✅ Pet-friendlyPerennial life cycle, with continuous growth throughout the year.60 to 120 cm

LightFull sun

WaterMedium, allows soil to dry between waterings

DifficultyEasy

ColdHardy down to -5 degrees Celsius.

Full sunMedium, allows soil to dry between wateringsEasyHardy down to -5 degrees Celsius.

Description & origin

The Black Adder New Zealand Flax is a perennial plant with long, narrow, dark-colored leaves. It is a popular choice for gardens due to its resilience and unique aesthetics.

Size

Maintains an upright and compact form, ideal for borders.

Foliage

Long, narrow leaves, dark in color, that maintain their appearance year-round.

Flowering

Blooms in spikes, but flowering is not the main attraction of the plant.

Detailed care

Light

Prefers full sun but tolerates some shade.

Soil

Well-drained soil rich in organic matter.

Watering

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

Temperature

Hardy to mild temperatures, tolerates light frosts.

Fertilising

Light fertilization in spring with a balanced fertilizer.

Repotting

Transplant in spring or autumn, avoiding periods of intense heat.

Pruning

Occasional pruning to remove dry or damaged leaves.

Propagation

Easily propagated by division of clumps.

Common problems

Dry leaves

May occur if the plant does not receive enough water.

Pests

Susceptible to mealybugs and aphids, which can affect the plant's health.

Fungal diseases

In conditions of excessive humidity, it may develop fungi.

Uses & curiosities

In the garden

Ideal for borders and flower beds
Ornamental plant in contemporary style gardens
Used in landscaping arrangements due to its hardiness

Other uses

Can be grown in pots or window boxes

Did you know…

This variety is known for its almost black leaves, which contrast well with other plants. It is native to New Zealand and is quite hardy.