Portulaca grandiflora Happy Hour ('Happy Hour') mixed (d)

RHS Plant Profile
rose moss [Happy Hour] mixed

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Synonyms

Portulaca 'Happy Hour'

Annual Biennial

A spreading annual to 25cm high forming a mound of red stems clothed with fleshy, cylindrical leaves to 2.5cm long and bearing semi-double flowers in a range of colours through summer

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1 year
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun
Aspect
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)
H2
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Portulacaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Spreading branched
Genus
Portulaca are slightly succulent annuals with fleshy leaves and cup-shaped flowers in shades of red, purple, pink, yellow and white
Name Status
Trade

How to Grow

Cultivation

Grow in well-drained soil in full sun; thrives in poor, sandy soils

Propagation

Propagate by seed

Suggested planting locations and garden types

  • City and courtyard gardens
  • Gravel garden
  • Patio and container plants
  • Rock garden
  • Flower borders and beds

Pruning

No pruning required

Pests

May be susceptible to aphids

Diseases

Generally disease-free, though seedlings can be susceptible to damping off