Overview

Ranzania japonica is a perennial herb in the genus Ranzania, part of the Berberidaceae family. Ranzania japonica grows best in partial shade, and tolerates well-drained and humus-rich soils and acidic to neutral pH. Its UK hardiness is rated H5. Suggested uses include woodland garden, shade garden and ground cover. It is native to Japan.

About

Ranzania japonica is a perennial herb in the Berberidaceae that forms small colonies from an underground rhizome. Each stem carries divided (trifoliate) leaves with one or a small cluster of drooping, cup-shaped mauve flowers. It favours partial shade in sheltered spots and prefers moist, humus-rich, well-drained soil. Plants are hardy in UK gardens (H5) and flower in May to June.

Wikipedia contributors, CC BY-SA 4.0 — Ranzania japonica

In the garden

A woodland perennial from Japan, Ranzania japonica belongs to the barberry family (Berberidaceae) and typically grows from fleshy stems arising from an underground rhizome. Stems bear paired trifoliate leaves and carry single or small clusters of nodding, cup-shaped mauve flowers, which appear in May to June. The species tends to form small colonies rather than isolated clumps. Place Ranzania japonica in partial shade and give it a sheltered site out of strong winds; it prefers moist, humus-rich, well-drained soil with an acidic to neutral pH. The hardiness rating H5 indicates it is hardy in most UK gardens but benefits from protection from exposure on cold, windy sites. Keep soil consistently moist rather than letting it dry out, and incorporate leaf mould or other humus when planting to improve structure and retain moisture. It suits a woodland or shade garden and can be used as a ground-covering herbaceous plant beneath trees or along shaded borders. After the May–June flowering period the mauve blooms develop into upright clusters of white berries, giving a different seasonal interest to the planting.

Growing conditions

Best soil and position for Ranzania

Sunlight

partial shade

Soil type

well-drained, humus-rich

Soil pH

acidic to neutral

Soil moisture

moist

Exposure

sheltered

UK hardiness

H5

Plant details

Ranzania japonica size, habit and characteristics

Plant type

perennial herb

Suggested uses

woodland garden, shade garden, ground cover

Native to

Japan

Care notes

Pruning and caring for Ranzania japonica

Cultivation

Prefers shaded, sheltered positions with moist, humus-rich soil. Avoid direct sunlight and dry conditions.

Pruning

Remove dead or damaged foliage after flowering to maintain appearance.

Propagation

Division in spring or autumn, seed propagation possible but slow.

Frequently asked questions