Veronica austriaca subsp. teucrium 'Royal Blue'

RHS Plant Profile

saw-leaved speedwell 'Royal Blue'

RHS

Synonyms

Veronica 'Royal Blue'
Veronica austriaca 'Royal Blue'
Veronica teucrium 'Royal Blue'

Herbaceous Perennial

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'Royal Blue' is a bushy herbaceous perennial to 45cm in height, with toothed, oblong leaves and axillary racemes of clear blue flowers

Position

Full sun, Partial shade

Soil Types

Loam

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Loam

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or West–facing or East–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): H6
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: Bushy
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

Grow in loamy, moderately fertile, moist but well-drained soil in full sun or partial shade

Propagation

Propagate by division in autumn or spring

Suggested planting locations and garden types

Cottage and informal garden
Flower borders and beds
Ground cover
Garden edging

Pruning

Remove spent flowers to encourage compact habit and good flowering in the folowing year

Pests

May be susceptible to aphids

Diseases

May be susceptible to downy mildews, fungal leaf spot, fungal rot, Phytophthora and sometimes honey fungus