Veronica gentianoides 'Robusta'

RHS Plant Profile
gentian speedwell 'Robusta'

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Herbaceous Perennial
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A clump-forming herbaceous perennial to 60cm high, with rosettes of lance-shaped, glossy green leaves forming a dense mound at the base. Upright stems bear spikes of pale blue flowers with deeper blue veins in early summer

Position

Full sun, Partial shade

Soil Types

Loam, Chalk, Clay

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
East–facing or 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)
H7
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Plantaginaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Matforming, Columnar upright
Genus
Veronica can be annuals, perennials or sub-shrubs with paired leaves and small flowers usually in terminal or axillary racemes or spikes
Name Status
Accepted

How to Grow

Cultivation

Thrives in sun in well-drained soil that does not dry out, will tolerate part day shade but flowering may be reduced. Mulching is beneficial on drier soils. Will not tolerate waterlogging

Propagation

Propagate by division in spring or autumn

Suggested planting locations and garden types

  • Cottage and informal garden
  • Flower borders and beds
  • Garden edging

Pruning

Deadhead to encourage further flowers. Remove faded flower stems in autumn

Pests

May be susceptible to aphids

Diseases

May be susceptible to downy mildews, powdery mildews and leaf spot