• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Paulownia tomentosa

foxglove tree

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
foxglove tree

© � RHS 2003

  • Other common names foxglove tree
    princess tree

  • Genus Paulownia are deciduous trees with large, ovate leaves and erect panicles of foxglove-like flowers in spring; they can also be coppiced for extra-large leaves at expense of flowers

  • Family Paulowniaceae / Paulowniaceae

  • Details P. tomentosa is a broad, medium-sized deciduous tree with handsome ovate or shallowly-lobed leaves to 25cm in length. Fragrant, light lilac-purple flowers in large panicles. Fruits ovoid, thinly woody

  • Plant range Eastern USA

Characteristics

  • Foliage Deciduous

  • Habit Spreading / Branched

  • Fragrance Flower

  • 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)
    Old hardiness ratings

    While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as 'Old'.

    • H1 - Requires heated glass
    • H2 - Requires unheated glass
    • H3 - Hardy outside in some regions of the UK
    • H4 - Hardy throughout the UK
    • H1 + H3 - Requires heated glass but may be grown outside in summer

    For full details of the hardiness ratings see

    see more

    H5

Colour

Sunlight

  • Full Sun

  • Aspect East-facing or South-facing or West-facing

  • Exposure Sheltered

Soil

  • Chalk

    Loam

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Chalk

  • MoistureWell-drained

  • SoilLoam, Clay, Sand, Chalk

  • pHAcid, Neutral, Alkaline

Size

  • Ultimate height

    8-12 metres

  • Ultimate spread

    wider than 8 metres

  • Time to ultimate height

    20-50 years

How to grow

Cultivation Grow in moist, humus-rich, fertile soils. Protect young trees from frost. Can be pollarded. Very tolerant of atmospheric pollution

Propagation Propagate by seed sown in containers in a cold frame in autumn or spring. Seed germinates best if exposed to light. Seedlings must be protected from frost

Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden

How to care

Pruning Pruning group 1 or Pruning group 7 for foliage effect

Pests Generally pest free

Diseases Generally trouble free

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