Cotyledon orbiculata var. oblonga

RHS Plant Profile
silver crown

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Other common names

oblong round-leafed navel-wort, silver ruffles

Synonyms

Cotyledon undulata

Cactus Succulent Conservatory Greenhouse
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An upright, evergreen, succulent subshrub branching from ground level and grows to around 50cm tall. Fleshy leaves, 5-10cm long, are obovate, wedge-shaped to oblong-linear, grey-green in colour with a powdery waxy coating and margins that may be edged deep red. Flower stems to 70cm high bear clusters of bell-shaped to tubular, pendulous, pinkish-orange flowers

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
5–10 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 Neutral

Position

Full sun
Aspect
West–facing or South–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
Crassulaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Spreading branched
Genus
Cotyledon are succulent perennials and shrubs with simple, opposite leaves and nodding, bell-shaped red, orange or yellow flowers borne in compact panicles
Name Status
Correct
Plant Range
South Africa

How to Grow

Cultivation

Grow under glass in a standard cactus compost, in full light. Provide low humidity. Water freely when in growth and keep just moist at other times. Apply a dilute low nitrogen fertilizer fortnightly during late spring and summer. Keep almost dry in the winter. Stand plants outside during the summer months. See houseplant cacti and succulent cultivation for further details

Propagation

Propagate by seed or from stem cuttings

Suggested planting locations and garden types

  • Houseplants
  • Patio and container plants
  • Sub-tropical
  • Low Maintenance
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to mealybugs, vine weevil and aphids

Diseases

Generally disease-free