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Phormium cookianum subsp. hookeri 'Tricolor' (Mountain flax 'Tricolor')
1 hour care
per year
per year
1.5m
Max height
Max height
2.5m
Max spread
Max spread
5-10 years
To maturity
To maturity
Plant details
Botanical name
Phormium cookianum subsp. hookeri 'Tricolor'
Other names
Mountain flax 'Tricolor', Phormium cookianum 'Tricolor'
Genus
Phormium Phormium
Variety or Cultivar
'Tricolor' _ P. cookianum subsp. hookeri 'Tricolor' is an evergreen perennial with erect, sword-shaped leaves with yellow stripes and red margins. Established plants produce large panicles of yellow-green flowers in summer.
Phormium cookianum subsp. hookeri 'Tricolor' is: Evergreen
Habit
Clump-forming
Awards
RHS AGM (Award of Garden Merit)
Flower
Yellow-green in Summer
Foliage
Green, Yellow, Striped, Red in All seasons
How to care
Watch out for
Specific pests
Phormium mealybug Phormium mealybug
Diseases
Generally disease free.
General care
Pruning
Remove spent flower stalks at the end of autumn.
Propagation methods
Division
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Where to grow
Phormium cookianum subsp. hookeri 'Tricolor' (Mountain flax 'Tricolor') will reach a height of 1.5m and a spread of 2.5m after 5-10 years.
Suggested uses
Architectural, Beds and borders, City, Coastal, Cottage/Informal, Drought Tolerant, Instant, Low Maintenance, Sub-Tropical
Cultivation
Plant in well-drained, fertile soil in full sun. In cold areas, protect from frost with a dry mulch in winter.
Soil type
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Soil drainage
Well-drained, Moist but well-drained
Soil pH
Acid, Alkaline, Neutral
Light
Full Sun
Aspect
South
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
Botanical name
Phormium cookianum subsp. hookeri 'Tricolor'
Other names
Mountain flax 'Tricolor', Phormium cookianum 'Tricolor'
Genus
Phormium Phormium
Variety or Cultivar
'Tricolor' _ P. cookianum subsp. hookeri 'Tricolor' is an evergreen perennial with erect, sword-shaped leaves with yellow stripes and red margins. Established plants produce large panicles of yellow-green flowers in summer.
Foliage
Evergreen
Habit
Clump-forming
Awards
RHS AGM (Award of Garden Merit)
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Colour
Flower
Yellow-green in Summer
Foliage
Green, Yellow, Striped, Red in All seasons
How to care
Watch out for
Specific pests
Diseases
Generally disease free.
General care
Pruning
Remove spent flower stalks at the end of autumn.
Propagation methods
Division
Monthly care advice
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Where to grow
Phormium cookianum subsp. hookeri 'Tricolor' (Mountain flax 'Tricolor') will reach a height of 1.5m and a spread of 2.5m after 5-10 years.
Suggested uses
Architectural, Beds and borders, City, Coastal, Cottage/Informal, Drought Tolerant, Instant, Low Maintenance, Sub-Tropical
Cultivation
Plant in well-drained, fertile soil in full sun. In cold areas, protect from frost with a dry mulch in winter.
Soil type
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Soil drainage
Well-drained, Moist but well-drained
Soil pH
Acid, Alkaline, Neutral
Light
Full Sun
Aspect
South
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 10, Zone 9
Defra's Risk register #1
Plant name
Phormium cookianum subsp. hookeri 'Tricolor' (Mountain flax 'Tricolor')
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/
In order to add a note on this plant, please add this plant to your plant lists.
| This plant likes... | Garden match | |
| Soil types: | Chalky, Clay, Loamy, Sandy (will tolerate most soil types) | Tell us... |
| Soil drainage: | Well-drained, Moist but well-drained | Tell us... |
| Soil pH: | Acid, Alkaline, Neutral | Tell us... |
| Light: | Full Sun | Tell us... |
| Aspect: | South | Tell us... |
| Exposure: | Exposed, Sheltered | Tell us... |
| Hardiness: | Tender in frost (H3), Hardy (H4) | Tell us... |
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Phormium overwatered?!
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