Iris 'White Excelsior' (Dut) | iris 'White Excelsior'

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Herbaceous Perennial

A bulbous perennial, growing to 60cm tall, with narrow, upright, strap-like, dark green leaves and tall, strong stems bearing elegant flowers with white standards and yellow marked white falls. Perfect for cut flowers and container growing

Position

Full sun

Soil Types

Chalk, Loam, Clay, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Loam Clay Sand

Moisture: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: East–facing or South–facing or West–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Iridaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Columnar upright
Potentially harmful: Harmful if eaten. Wear gloves and other protective equipment when handling. Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
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: Unresolved
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea: Dutch Iris are herbaceous bulbous perennials with narrow, channelled leaves and blue yellow or white flowers in late spring and early summer

How to Grow

Cultivation

Grow in any moderately fertile, neutral to alkaline, well drained soil in full sun. Plant bulbs at twice their height in late summer or early autumn and feed with a high potash fertiliser after flowering. See bulb iris cultivation for more information

Propagation

Propagate by offsets in late summer or early autumn

Suggested planting locations and garden types

Coastal
Cottage and informal garden
City and courtyard gardens
Patio and container plants
Cut flowers
Flower borders and beds

Pruning

Cut back old flower stems after flowering and remove dying foliage in autumn. Lift and separate bulbs in autumn

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to leaf spots, ink disease, rust diseases, bulb rot and viruses; see Iris diseases for more details