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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names mountain flax 'Tricolor'
Synonyms Phormium cookianum 'Tricolor'
Family Hemerocallidaceae
Genus Phormium are evergreen perennials, making a large clump of leathery, strap-shaped leaves, with tall panicles of small, tubular flowers in summer
Details 'Tricolor' is an evergreen perennial making a large clump of sword-shaped leaves striped with yellow and green, edged with red. Flowers yellowish-green, in large panicles appear on mature plants in summer
Foliage Evergreen
Habit Clump-forming
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H4
Full Sun
Aspect South-facing or East-facing
Exposure Exposed or Sheltered
Clay
Loam
Chalk
Sand
MoistureWell-drained, Moist but well-drained
SoilClay, Loam, Chalk, Sand
pHAcid, Alkaline, Neutral
Ultimate height 1-1.5 metres
Ultimate spread 1.5-2.5 metres
Time to ultimate height 5-10 years
Cultivation Grow in fertile, moist but well-drained soil in full sun. In frost-prone areas, provide a deep, dry mulch in winter
Propagation Propagate by division in spring
Suggested planting locations and garden types Flower borders and beds Low Maintenance Architectural City & Courtyard Gardens Cottage & Informal Garden
Pruning Deadhead in autumn to prevent winter rocking which can damage the plant
Pests May be attacked by mealybugs
Diseases Generally disease free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
mountain flax 'Tricolor'
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