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Persicaria affinis ‘Superba’ (Lesser Knotweed)

Lesser Knotweed 'Superba', East Indian Knotweed 'Superba', Himalayan Knotweed 'Superba', Bistorta affinis 'Superba', Polygonum affine 'Superba', Persicaria affinis Dimity

AGM Award
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Persicaria Bistorta 'Superba', Bistort 'Superba', Knotweed 'Superba', Adderwortel, Polygonum Bistorta 'Superbum', Shade plants, shade perennial, pink flowers, plants for shade, deer resistant plants, deer resistant perennials

Vigorous, Persicaria affinis ‘Superba’ (Lesser Knotweed) is a mat-forming, semi-evergreen perennial boasting charming spikes, 3 in. long (8 cm), densely packed with tiny, pale pink flowers that deepen to crimson as they mature. Blooming for weeks from midsummer into fall, the blossoms are borne above the foliage mat of elliptic to lance-shaped, deep green leaves which turn bronzy-red in the fall. This dwarf variety makes a wonderful ground cover for the garden.

  • Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society.
  • Grows up to 6-12 in. tall (15-30 cm) and 2 ft. wide (60 cm) or more. This plant is not as invasive as many of the other species and may be controlled with selective pruning.
  • Full sun to part shade lover, it is best grown in average, moist, well-drained soils. Best flower production in full sun. While drought tolerant, this plant prefers moist, fertile soils that do not dry out.
  • This plant is very versatile and can be used as a groundcover or as an edging specimen, mixed with other spring flowering bulbs and other perennials in partially shaded beds, borders, in cottage gardens or city gardens. Provides stability to banks and carpets stones in a rock garden.
  • Virtually pest and disease free. Deer resistant.
  • Propagate by division in spring or autumn.

Requirements

Hardiness 5 - 8
Heat Zones 1 - 8
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17
Plant Type Perennials
Plant Family Polygonaceae
Genus Persicaria
Common names Knotweed
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid, Late), Fall
Height 6" - 1' (15cm - 30cm)
Spread 1' - 2' (30cm - 60cm)
Spacing 18" - 24" (50cm - 60cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy, Semi-Evergreen
Tolerance Drought, Deer
Garden Uses Banks And Slopes, Beds And Borders, Edging, Ground Covers, Underplanting Roses And Shrubs
Garden Styles Traditional Garden, Informal and Cottage, Gravel and Rock Garden, City and Courtyard
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Alternative Plants to Consider

Persicaria amplexicaulis ‘Atrosanguinea’ (Mountain Fleece)
Persicaria affinis (Lesser Knotweed)
Persicaria alpina (Alpine Knotweed)
Persicaria amphibia (Amphibious Bistort)
Persicaria virginiana (Virginia Knotweed)
Persicaria odorata (Asian Mint)

Recommended Companion Plants

Stipa tenuissima (Mexican Feather Grass)
Helianthus ‘Lemon Queen’ (Sunflower)
Allium cristophii (Star of Persia)
Cirsium rivulare ‘Atropurpureum’ (Plume Thistle)

Find In One of Our Guides or Gardens

Persicaria amplexicaulis (Mountain Fleece)
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 5 - 8
Heat Zones 1 - 8
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17
Plant Type Perennials
Plant Family Polygonaceae
Genus Persicaria
Common names Knotweed
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid, Late), Fall
Height 6" - 1' (15cm - 30cm)
Spread 1' - 2' (30cm - 60cm)
Spacing 18" - 24" (50cm - 60cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy, Semi-Evergreen
Tolerance Drought, Deer
Garden Uses Banks And Slopes, Beds And Borders, Edging, Ground Covers, Underplanting Roses And Shrubs
Garden Styles Traditional Garden, Informal and Cottage, Gravel and Rock Garden, City and Courtyard
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Persicaria
Guides with
Persicaria
Not sure which Persicaria to pick?
Compare Now

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