Pelargonium Grandeur Classic White (Z)

RHS Plant Profile
geranium [Grandeur Classic White]

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An upright, strong and bushy tender evergreen perennial with rounded, dark green leaves with wavy edges. Clusters of large, pure white double flowers on sturdy stems appear in summer. Ideal for pots, containers and hanging baskets

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Chalk Loam Sand
Moisture
Well–drained
pH
Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
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)
H1A

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Geraniaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
Genus
Pelargonium can be perennials, sub-shrubs or shrubs, sometimes succulent and mostly evergreen, with palmately lobed or pinnately divided leaves and clusters of slightly irregular, 5-petalled flowers
Name Status
Trade
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

Zonal pelargoniums are bushy evergreen perennials with fleshy stems, rounded, palmately lobed leaves often zoned with maroon, and single or double flowers in shades of purple, red, pink, orange and white, from early to late summer

How to Grow

Cultivation

May be planted outdoors in beds, baskets and containers after all risk of frost has passed; young plants may need to be hardened off first. Grow in fertile, neutral to alkaline soil in full sun, and overwinter indoors. See pelargonium cultivation for more detailed advice

Propagation

Propagate by seed or by softwood cuttings

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Hanging Basket
  • Houseplants
  • Patio and container plants
  • Low Maintenance
  • Conservatory and greenhouse
  • Flower borders and beds

Pruning

No pruning required. Deadhead regularly to encourage further floweringNo pruning required. Deadhead regularly to encourage new flowers

Pests

May be susceptible to vine weevils, leafhoppers, root mealybugs, aphids, caterpillars, western flower thrips and sciarid flies

Diseases

May be susceptible to grey moulds, black leg, pelargonium rust and pelargonium viruses