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Herbaceous Perennial

Thalictrum kiusianum

Kyushiu meadow rue

A compact, mat-forming, rhizomatous perennial to around 10cm tall and 30cm wide. Small, fern-like, bronze-tinted, lobed leaves form a low mound above which loose clusters of tiny, star-shaped pale pink-purple flowers are borne in summer on upright stems

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Ultimate height

Up to 10cm

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Clay

Loam

Moisture

Moist but well–drained, Poorly–drained

pH

Acid, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

South–facing or West–facing or East–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)

Botanical details

Family: Ranunculaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Matforming
Genus: Thalictrum can be rhizomatous or tuberous perennials with ternately or pinnately divided, often attractive foliage, and panicles or racemes of small flowers with showy stamens and sometimes large colourful petal-like sepals
Name status: Correct
Plant range: Japan & Korea

How to grow

Cultivation

Best grown in a moist, humus-rich soil in part shade; growth will be less vigorous if grown in full shade. Will tolerate full sun if soil is kept consistently moist

Propagation

Propagate by seed or by division

Suggested planting locations and garden types

Cottage and informal garden
Rock garden
Patio and container plants
Flower borders and beds
Garden edging

Pruning

Cut down stems after flowering unless seed is required

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews

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