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Pelargonium 'Royal Oak' (Sc/C)
  • RHS AGM

geranium 'Royal Oak'

'Royal Oak' grows to 40cm in height, with somewhat oak-like, dark green, balsam-scented leaves with a deep purple central blotch, and small clusters of mauve flowers

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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
Chalk
Clay
Loam
Sand
Moisture
Well–drained
pH
Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green Purple
Summer Purple Green Purple
Autumn Green Purple
Winter Green Purple
Position
  • Full sun
Aspect

East–facing or South–facing or West–facing

Exposure
Sheltered
Hardiness
H1C
Botanical details
Family
Geraniaceae
Native to the UK
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

Accepted

Horticultural Group
Scented-leaved pelargoniums are evergreen shrubs or perennials with strongly aromatic foliage and small, single flowers in shades of pink, purple or white

How to grow

Cultivation

Under glass grow in a loam-less or loam-based potting compost in full light with shade from hot sun with good ventilation. When in growth water moderately and apply a balanced liquid fertiliser in spring and early summer. A high potash fertiliser should be used when in flower. Water sparingly in winter. Can be grown outside in frost-free areas in a fertile soil. See Pelargonium cultivation for further advice.

Propagation

Propagate by softwood cuttings in spring, late summer or early autumn

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

Deadhead regularly

Pests

Susceptible to vine weevil, caterpillars and thrips

Diseases

May be subject to grey moulds when grown under glass

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