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

Beginner
skill rating
1 hour care
per year
1m
Max height
1m
Max spread
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

Habit

Clump-forming

Flower

Red in Autumn

Foliage

Black, Flushed red in All seasons

How to care

Watch out for

Specific pests

Phormium mealybug Phormium mealybug

Diseases

Generally disease free.

General care

Propagation methods

Division


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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

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Tender in frost (H3), Hardy (H4)

Companion plants

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

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.

Foliage

Evergreen

Habit

Clump-forming


Colour

Flower

Red in Autumn

Foliage

Black, Flushed red in All seasons


How to care

Watch out for

Specific pests

Phormium mealybug

Diseases

Generally disease free.

General care

Propagation methods

Division


Monthly care advice


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

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Tender in frost (H3), Hardy (H4)

USDA zones

Zone 11, Zone 10, Zone 9, Zone 8

Defra's Risk register #1

Plant name

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

Common pest name

Australian grapevine yellows; Australian lucerne yellows; Australian yellows of grapevine

Scientific pest name

Candidatus Phytoplasma australiense'

Type

Phytoplasma

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

4

General biosecurity comments

Phytoplasma present in Australia and New Zealand which could be damaging to grapevine and strawberry production; in particular; if introduced to the UK. EU regulations help to mitigate the risk of entry.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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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: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Tender in frost (H3), Hardy (H4) Tell us...

DISCUSS THIS PLANT

Phormium with redy brown leaves

My Phormium is 4years old and this winter it looks a state, most of the leaves are bent over. If I cut the leaves to the ground, will it regrow. Many Thanks read more

There are 0 active discussions about Phormium cookianum 'Black Adder' (New Zealand flax 'Black Adder')

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GARDENS WITH THIS PLANT

My Garden
My Garden
Stuart D. McLeod
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My Garden
Sam
74 Doods Park Road
74 Doods Park Road
Hugh Tanton

ARTICLES WITH THIS PLANT

Modern Family Garden in Seven Oaks

By garden designer Katrina Kieffer-Wells of Earth Designs. This modern family garden was split into 3 distinct areas. read more

Contemporary Garden near Dorset Coast

Designed by Helen Elks-Smith MSGD. The garden now provides somewhere to sit in the sun for morning coffee, for lunch and to catch the last rays of summer. read more


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