Symphytum × uplandicum 'Bocking 14'

RHS Plant Profile
Russian comfrey 'Bocking 14'

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Russian comfrey 'Bocking 14' RHS

Synonyms

Symphytum 'Bocking'
Symphytum ibericum 'Bocking 14'

Herbaceous Perennial
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Vigorous, clump-forming, upright perennial to 2m tall, with oblong mid-green leaves. Flowers are purple-blue, appearing from late spring through to summer. This plant is a sterile hybrid, it won't self seed and is non-invasive

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam

Max Height

1.5-2.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
1.5-2.5 metres

Growing Conditions

Chalk Clay Loam
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or North–facing or 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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Boraginaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Potentially harmful
Harmful if eaten repeatedly. Wear gloves and other protective equipment when handling Pets (rabbits, rodents): Harmful if eaten repeatedly - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus
Symphytum are rhizomatous herbaceous perennials, sometimes invasive, with large leaves and nodding clusters of tubular flowers
Name Status
Accepted

How to Grow

Cultivation

Grow in moderately fertile, moist but free draining soil in sun or partial shade. Plants are sterile and non-invasive

Propagation

Propagate by division in spring. Take root cuttings in early winter

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildlife gardens

Pruning

Cut back to the ground in autumn

Pests

Generally pest-free

Diseases

Generally disease-free