Zantedeschia 'White Giant'

RHS Plant Profile

arum lily 'White Giant'

RHS / Joanna Kossak

Synonyms

Zantedeschia aethiopica 'White Giant'

Aquatic Herbaceous Perennial

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A semi-evergreen, clump-forming perennial to 2m high with large, glossy, slightly ruffled, white-speckled, dark green leaves. Large, funnel-shaped white spathes are borne on upright stems above the foliage from summer into early autumn

Position

Full sun

Soil Types

Clay, Loam

Max Height

1.5-2.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity: 5–10 years
Max Spread: 1-1.5 metres
Max Height: 1.5-2.5 metres

Growing Conditions

Clay Loam

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

Position

Full sun

Aspect: West–facing or South–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): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Araceae
Native to GB/Ireland: No
Foliage: Semi evergreen
Habit: Bushy
Potentially harmful: Harmful if eatenskin/eye irritant. Wear gloves and other protective equipment when handling. Pets: Harmful if eatenskin/eye irritant - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Zantedeschia can be deciduous or semi-evergreen, tuberous perennials with lance-shaped or arrow-shaped leaves and tiny yellow flowers forming a dense spike-like spadix, with a showy, hood-like spathe, sometimes followed by orange berry-like fruits
Name Status: Accepted

How to Grow

Cultivation

Grow in moist soil in full sun. If cultivating as a marginal aquatic plant, grow in planting baskets in heavy loam soil in water up to 30cm deep, in full sun. Protect overwintering plants by placing baskets in a frost-free environment. See Zantedeschia cultivation LJD

Propagation

Propagate by division

Suggested planting locations and garden types

Cottage and informal garden
Flower borders and beds
Garden edging

Pruning

No pruning required

Pests

May be susceptible to aphids

Diseases

Generally disease-free