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Herbaceous Perennial

Iris forrestii
  • RHS AGM

Forrest iris

I. forrestii is a clump-forming herbaceous perennial to 45cm tall, with narrow leaves glossy above, greyish beneath, and yellow flowers 6cm wide, the falls finely streaked with brown lines, opening in early summer

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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Clay
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Yellow Green
Autumn
Winter
Position
  • Full sun
  • Partial shade
Aspect

South–facing or West–facing or East–facing

Exposure
Exposed or Sheltered
Hardiness
H6
Botanical details
Family
Iridaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Genus

Iris may be rhizomatous or bulbous perennials, with narrow leaves and erect stems bearing flowers with 3 large spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer

Name status

Correct

Plant range
SW China

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How to grow

Cultivation

Grow in moisture-retentive, well-drained soil in full sun or part shade; mulch in spring with well-rotted organic matter particularly in drier soils

Propagation

Propagate by seed in autumn or spring, propagate by division in summer or autumn

Suggested planting locations and garden types
  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Flower borders and beds
Pruning

Remove any dying foliage in autumn, old flower stems can be cut down after flowering

Pests

Slugs and snails may damage leaves and rhizomes, aphids and thrips may damage leaves

Diseases

May be affected by grey moulds, leaf spot (fungal) or a virus

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