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Persicaria bistorta 'Superba' (Knotweed 'Superba')
1 hour care
per year
per year
0.75m
Max height
Max height
1m
Max spread
Max spread
5-10 years
To maturity
To maturity
Plant details
Botanical name
Persicaria bistorta 'Superba'
Other names
Knotweed 'Superba', Adderwortel
Genus
Persicaria Persicaria
Variety or Cultivar
'Superba' _ 'Superba' is a mat-forming, semi-evergreen perennial with large, ovate foliage and spikes of large, white bottlebrush flowers from late-summer to early-autumn.
Persicaria bistorta 'Superba' is: Semi evergreen
Habit
Creeping, Erect flower stem, Mat Forming
Awards
RHS AGM (Award of Garden Merit)
Foliage
Green in Summer; Brown in Autumn; Brown in Winter
How to care
Watch out for
Pests
Generally pest-free.
Diseases
Generally disease-free.
General care
Pruning
Cut the plant back after flowering has finished
Propagation methods
Division
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Where to grow
Persicaria bistorta 'Superba' (Knotweed 'Superba') will reach a height of 0.75m and a spread of 1m after 5-10 years.
Suggested uses
Beds and borders, Bog garden, Cottage/Informal, Ground Cover, Low Maintenance, Waterside
Cultivation
Plant in any moist soil in sun or partial shade. Also likes a boggy, water edge position.
Soil type
Clay, Loamy
Soil drainage
Moist but well-drained, Moisture-retentive
Soil pH
Acid, Alkaline, Neutral
Light
Partial Shade, Full Sun
Aspect
North, South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
Companion plants
We do not currently have companion plants added for this plant.
Botanical name
Persicaria bistorta 'Superba'
Other names
Knotweed 'Superba', Adderwortel
Genus
Persicaria Persicaria
Variety or Cultivar
'Superba' _ 'Superba' is a mat-forming, semi-evergreen perennial with large, ovate foliage and spikes of large, white bottlebrush flowers from late-summer to early-autumn.
Foliage
Semi evergreen
Habit
Creeping, Erect flower stem, Mat Forming
Awards
RHS AGM (Award of Garden Merit)
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Colour
Foliage
Green in Summer; Brown in Autumn; Brown in Winter
How to care
Watch out for
Pests
Generally pest-free.
Diseases
Generally disease-free.
General care
Pruning
Cut the plant back after flowering has finished
Propagation methods
Division
Monthly care advice
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Where to grow
Persicaria bistorta 'Superba' (Knotweed 'Superba') will reach a height of 0.75m and a spread of 1m after 5-10 years.
Suggested uses
Beds and borders, Bog garden, Cottage/Informal, Ground Cover, Low Maintenance, Waterside
Cultivation
Plant in any moist soil in sun or partial shade. Also likes a boggy, water edge position.
Soil type
Clay, Loamy
Soil drainage
Moist but well-drained, Moisture-retentive
Soil pH
Acid, Alkaline, Neutral
Light
Partial Shade, Full Sun
Aspect
North, South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
USDA zones
Zone 8, Zone 7, Zone 6, Zone 5
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Persicaria bistorta 'Superba'
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Persicaria bistorta 'Superba' (Knotweed 'Superba')
| This plant likes... | Garden match | |
| Soil types: | Clay, Loamy | Tell us... |
| Soil drainage: | Moist but well-drained, Moisture-retentive | Tell us... |
| Soil pH: | Acid, Alkaline, Neutral | Tell us... |
| Light: | Partial Shade, Full Sun | Tell us... |
| Aspect: | North, South, East, West | Tell us... |
| Exposure: | Exposed, Sheltered | Tell us... |
| Hardiness: | Hardy (H4) | Tell us... |
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