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Herbaceous PerennialAlpine Rockery

Scutellaria diffusa

A mat-forming perennial to a height of 8cm with small hairy grey-green leaves. The flowers are blue-purple in colour and held in clusters over the foliage in summer

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Ultimate height

Up to 10cm

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Loam

Sand

Chalk

Moisture

Well–drained

pH

Neutral, Alkaline, Acid

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

West–facing or South–facing

Exposure

Exposed or Sheltered

Drought resistance

Yes

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)

Botanical details

Family: Lamiaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Matforming, Spreading branched, Clump forming
Genus: Scutellaria are annuals, herbaceous perennials or sub-shrubs with opposite pairs of leaves and blue, violet, yellow or white, two-lipped, tubular flowers borne in the leaf axils or in terminal spikes
Name status: Unresolved

How to grow

Cultivation

Grow in a rock garden, scree bed, or alpine house in a gritty compost in sun or dappled shade. Avoid winter wet

Propagation

Propagate by division of clumps in spring or by basal cuttings in late spring to early summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Gravel garden
Mediterranean climate plants
Patio and container plants
Rock garden
Wildlife gardens
Low Maintenance
Ground cover

Pruning

No pruning required

Pests

May be susceptible to aphids

Diseases

Generally disease-free

Get involved

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