Tropaeolum majus Alaska Series (v)

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nasturtium Alaska Series

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nasturtium Alaska Series RHS

Synonyms

Tropaeolum Alaska Series

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Annual Biennial
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Dwarf, bushy annuals to 30cm tall, with rounded green leaves speckled and splashed with creamy-white, and single flowers to 6cm wide, in shades of cream, yellow, orange and mahogany-red

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
West–facing or South–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
Tropaeolaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Skin allergen. Wear gloves and other protective equipment when handling
Genus
Tropaeolum can be annuals or perennials, bushy, trailing or climbing by twining stems, with simple or palmately lobed leaves and showy funnel-shaped flowers with five long-clawed petals and often a spur
Name Status
Accepted

How to Grow

Cultivation

Best grown in poor, well-drained soil in full sun, if the soil is too rich foliage will be produced at the expense of flowers

Propagation

Propagate by stem tip cuttings

Suggested planting locations and garden types

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

Pruning

Cut back after flowering

Pests

May be susceptible to glasshouse whitefly and glasshouse red spider mite and whitefly

Diseases

May be susceptible to virus diseases