Bistorta vacciniifolia
rock knotweed
A creeping perennial forming a wide mat of small, glossy ovate leaves which turn rusty-brown and persist through the winter. Slender spikes 6-8cm in length are packed with small pink flowers in late summer and early autumn
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Size
Ultimate height
0.1–0.5 metresTime to ultimate height
5–10 yearsUltimate spread
1–1.5 metresGrowing conditions
Moisture
Moist but well–drained, Poorly–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green | |||
|---|---|---|---|---|
| Summer | Pink | Green | ||
| Autumn | Pink | Brown | ||
| Winter | Brown |
Position
- Full sun
- Partial shade
Aspect
North–facing or East–facing or South–facing or West–facing
Exposure
Exposed or Sheltered Hardiness
H7Botanical details
- Family
- Polygonaceae
- Native to GB / Ireland
- No
- Foliage
- Semi evergreen
- Habit
- Matforming
- Genus
A genus of herbaceous, rhizomatous perennials with erect, unbranched stems, bearing short terminal spikes of small, white or pink, bell-shaped flowers
- Name status
Correct
- Plant range
- Himalaya
How to grow
Cultivation
Grow in any moist soil in full sun or partial shade See https://www.rhs.org.uk/plants/trials-awards for further information about RHS plant trials and awards
Propagation
Propagate by division in spring or autumn
Suggested planting locations and garden types
- Cottage and informal garden
- Rock garden
- Ground cover
- Flower borders and beds
Pruning
Cut back after flowering
Pests
Generally pest-free
Diseases
Generally disease-free
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