Sedum dendroideum subsp. praealtum

RHS Plant Profile
greater Mexican stonecrop

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Synonyms

Sedum praealtum

Cactus Succulent
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A succulent subshrub growing to 60cm height, with grey-brown woody-like stems, and club-shaped pale green, fleshy leaves that form a rosette on stems that bear yellow star-shaped flowers in spring

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.5-1 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)
H3

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
Sedum may be annuals or herbaceous or evergreen perennials with succulent stems and leaves and clusters of small, star-shaped flowers in summer or autumn
Name Status
Correct

How to Grow

Cultivation

Under glass, grow in peat-free, loam-based compost with added perlite, positioning plants in bright, filtered light. Water freely in the growing season and apply a half-strength liquid fertiliser monthly; water sparingly in winter. Potted plants can be moved onto the patio in summer. See houseplant cacti and succulent cultivation

Propagation

Propagate by softwood cuttings in early summer; detached leaves root readily

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Houseplants
  • Patio and container plants
  • Sub-tropical
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to slugs, snails, vine weevil grubs, scale insects and mealybugs

Diseases

May be susceptible to fungal and bacterial crown and root rots