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Herbaceous Perennial

Jeffersonia dubia

twin leaf

A deciduous perennial to 20cm tall, forming a compact clump of kidney-shaped, shallowly 2-lobed leaves, with pale violet-blue flowers 2.5cm across opening with the new leaves in early spring

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Ultimate height

0.1–0.5 metres

Time to ultimate height

1–2 years

Ultimate spread

0–0.1 metre

Loam

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full shade
Partial shade

Aspect

North–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)

Botanical details

Family: Berberidaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Bushy
Genus: Jeffersonia are small, clump-forming perennials with2-lobed, kidney-shaped leaves and bowl-shaped white or pale violet flowers in spring
Name status: Correct
Plant range: NE Asia

How to grow

Cultivation

Grow in moist, humus-rich, preferably neutral to acid soil in partial or full shade; top dress with leaf mould or other humus-rich material in autumn. Dislikes disturbance and may take a year or two to settle after transplanting; established plants tolerate drought

Propagation

Propagate by seed in containers in an open frame as soon as ripe or divide established plants in spring

Suggested planting locations and garden types

Rock garden
Flower borders and beds

Pruning

No pruning required

Pests

May be susceptible to slugs and snails

Diseases

Generally disease-free

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