Pelargonium 'Blackcurrant Yhu' (Dec)

RHS Plant Profile
geranium 'Blackcurrant Yhu'

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geranium 'Blackcurrant Yhu' RHS
Conservatory Greenhouse Bedding Houseplants

An evergreen, bushy perennial, to 35cm in height, with rounded, slightly-ridged pale-green to mid-green leaves. Clusters of flowers appear in summer and are a velvety dark-purple with dark-purple veining becoming prominent at the pale-pink petal edges

Position

Full sun

Soil Types

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

Loam Sand
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or East–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)
H1C

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
Accepted
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

Decorative pelargoniums are medium-sized plants with rounded leaves and clusters of single flowers like those of Regals

How to Grow

Cultivation

Grow in fertile well-drained soil in full sun. Remove spent flowers. To overwinter, grow small plants in late summer from cuttings. See also pelargonium cultivation

Propagation

Take softwood cuttings in summer and overwinter plants in frost free conditions or take softwood cuttings in spring

Suggested planting locations and garden types

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

Pruning

Deadhead regularly to prolong flowering

Pests

Leafhoppers, vine weevil, caterpillars, thrips, fungus gnats and aphids can be troublesome. Aphids are generally more problematic on over-wintered plants

Diseases

May be susceptible to foot and root rots in wet soils, grey moulds and a virus