Onosma alborosea

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Alpine Rockery Herbaceous Perennial

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An evergreen, clump-forming perennial up to 25cm in height with oblong or lance-shaped white bristled grey-green, leaves. In summer, bears bunches of tubular white flowers, turning to pink and purple as they mature, atop short stems

Position

Full sun

Soil Types

Chalk, Loam, Sand

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 Loam Sand

Moisture: Well–drained
pH: Alkaline or Neutral or Acid

Position

Full sun

Aspect: 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): H5
Drought Resistance: Yes

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Boraginaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Clump forming
Genus: A genus of rosette-forming flowering perennials, native to the dry, rocky areas of the Mediterranean and western Asia. Often grown as rock plants, they have narrow, green hairy foliage. Short stems carry long, pendant, tubular pink, yellow, red or white flowers
Name Status: Correct
Plant Range: Turkiye to W. Iran and Syria

How to Grow

Cultivation

Plant sideways in a wall, or in a scree bed, well-drained trough or rock crevice. Avoid winter wet. Alternatively, grow in an unheated greenhouse in a gritty compost mix of loam, leaf mould and grit. Avoid watering the foliage

Propagation

Propagate by seed in autumn, in a cold frame or sheltered position outside

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Rock garden
Gravel garden

Pruning

No pruning required

Pests

May be susceptible to aphids or glasshouse whitefly under glass

Diseases

Generally disease-free