× Semponium 'Vortex'

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semponium 'Vortex'

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semponium 'Vortex' RHS
Cactus Succulent Conservatory Greenhouse Alpine Rockery Houseplants

A vigorous, rosette-forming evergreen succulent with a large head up to 50cm in width, and a green 'whirlpool'-like central rosette from which spirals of dark red leaves grow out from in layers

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
2–5 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
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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Crassulaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
Genus
A relatively new inter-generic hybrid between Sempervivum and Aeonium, this genus of hardy succulents form rosettes of fleshy leaves in shades of red and green
Name Status
Unresolved

How to Grow

Cultivation

Grow under glass in peat-free, loam-based potting compost with added extra grit. Apply a balanced liquid fertiliser 2 or 3 times a year. Unlike their parent plants, they do not have a period of dormancy

Propagation

Propagate by cuttings of rosettes kept at 18ºC and barely moist until rooted, or by offsets

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Houseplants
  • Patio and container plants
  • Rock garden
  • Conservatory and greenhouse

Pruning

No pruning required but remove any dead foliage

Pests

May be susceptible to aphids and mealybugs under glass

Diseases

Generally disease-free