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Phormium cookianum 'Black Adder' (New Zealand flax 'Black Adder')

Skill rating
Skill rating
Beginner
skill rating
Maintenance level
Maintenance level
1 hour care
per year
Ultimate height
Ultimate height
1m
Max height
Ultimate spread
Ultimate spread
1m
Max spread
Time to maturity
Time to maturity
2-5 years
To maturity

Plant details

Botanical name: Phormium cookianum 'Black Adder'

Other names: New Zealand flax 'Black Adder'

Genus: Phormium Phormium

Variety or Cultivar: 'Black Adder' _ 'Black Adder' is a clump-forming evergreen perennial. It has slightly arching, upright strap-shaped leaves that are almost black with a dark-red tint.


Phormium cookianum 'Black Adder' is: Evergreen

Flower: Red in Autumn

Foliage: Black, Flushed red in All seasons

Habit: Clump-forming

How to care

Watch out for

Specific pests: Phormium mealybug Phormium mealybug

Diseases: Generally disease free.

General care

Propagation methods: Division. REGISTER to read more...


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Where to grow

Phormium cookianum 'Black Adder' (New Zealand flax 'Black Adder') will reach a height of 1m and a spread of 1m after 2-5 years.

Suggested uses: Architectural, Beds and borders, City, Coastal, Containers, Foliage only, Gravel, Low Maintenance

Cultivation: Grow moist, well-drained, fertile soil in full sun, will also tolerate partial shade. Foliage may be damaged by cold winds and hard frosts. Cut back the flower stalks to the base after they have finished.

Soil type: Sandy, Loamy

Soil drainage: Well-drained, Moist but well-drained

Soil pH: Alkaline, Acid, Neutral

Light: Partial Shade, Full Sun

Aspect: North, South, East, West

Exposure: Sheltered, Exposed

Hardiness: Tender in frost (H3), Hardy (H4)


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Companion plants

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Botanical name: Phormium cookianum 'Black Adder'

Other names: New Zealand flax 'Black Adder'

Genus: Phormium Phormium

Variety or Cultivar: 'Black Adder' _ 'Black Adder' is a clump-forming evergreen perennial. It has slightly arching, upright strap-shaped leaves that are almost black with a dark-red tint.


Phormium cookianum 'Black Adder' is: Evergreen

Flower: Red in Autumn

Foliage: Black, Flushed red in All seasons

Habit: Clump-forming

Watch out for

Specific pests: Phormium mealybug

Diseases: Generally disease free.

General care

Propagation methods: Division. REGISTER to read more...


Sign up for your FREE ACCOUNT today or login to receive detailed monthly care instructions

Phormium cookianum 'Black Adder' (New Zealand flax 'Black Adder') will reach a height of 1m and a spread of 1m after 2-5 years.

Suggested uses: Architectural, Beds and borders, City, Coastal, Containers, Foliage only, Gravel, Low Maintenance

Cultivation: Grow moist, well-drained, fertile soil in full sun, will also tolerate partial shade. Foliage may be damaged by cold winds and hard frosts. Cut back the flower stalks to the base after they have finished.

Soil type: Sandy, Loamy

Soil drainage: Well-drained, Moist but well-drained

Soil pH: Alkaline, Acid, Neutral

Light: Partial Shade, Full Sun

Aspect: North, South, East, West

Exposure: Sheltered, Exposed

Hardiness: Tender in frost (H3), Hardy (H4)


Use My Plant Check to see if this plant is a good match for your garden

We do not currently have companion plants added for this plant.

In order to add a note on this plant, please add this plant to your plant lists.

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This plant likes... Garden match
Soil types: Sandy, Loamy Tell us...
Soil drainage: Well-drained, Moist but well-drained Tell us...
Soil pH: Alkaline, Acid, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Sheltered, Exposed Tell us...
Hardiness: Tender in frost (H3), Hardy (H4) Tell us...

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Phormium with redy brown leaves

My Phormium is years old and this winter it...
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Phormium Back in Black
£ 11.99
Phormium Cream Delight
£ 11.99
Phormium Golden Sword
£ 10.99
Phormium Tenax Purpureum
£ 11.99
Phormium Tenax
£ 11.99
Phormium Red Sensation
£ 10.99

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