Moltkia × intermedia

RHS Plant Profile

intermediate moltkia

Synonyms

Lithodora × intermedia

Herbaceous Perennial

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A rounded evergreen subshrub to 30cm in height, with small, narrow, dark green leaves. Flowers funnel-shaped, bright, deep blue, in terminal clusters

Position

Full sun

Soil Types

Chalk

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

Chalk

Moisture: Well–drained
pH: Alkaline

Position

Full sun

Aspect: South–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): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Boraginaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
Genus: Moltkia can be evergreen or deciduous, subshrubs or perennials, with simple, lance-shaped or linear leaves and funnel-shaped or tubular blue, purple or yellow flowers in late spring and early summer
Name Status: Correct

How to Grow

Cultivation

Grow in poor, well-drained, preferably alkaline soil in full sun. Protect from winter wet and shelter from cold, dry winds

Propagation

Propagate by softwood cuttings in early summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Coastal
Gravel garden
Rock garden
Mediterranean climate plants
Flower borders and beds

Pruning

Pruning group 10 after flowering if required

Pests

Generally pest-free

Diseases

Generally disease-free